A decade of safety-related regulatory action in the Netherlands: a retrospective analysis of direct healthcare professional communications from 1999 to 2009

Pharmacovigilance for rare diseases: a bibliometrics and knowledge-map analysis based on web of science

OBJECTIVES

The aims of this paper is to search and explore publications in the field of pharmacovigilance for rare diseases and to visualize general information, research hotspots, frontiers and future trends in the field using the bibliometric tool CiteSpace to provide evidence-based evidence for scholars.

METHODS

We searched the Web of Science Core Collection (WoSCC) for studies related to pharmacovigilance for rare diseases, spanning January 1, 1997-October 25, 2022. CiteSpace software was utilized to discuss countries/regions, institutions, authors, journals, and keywords.

RESULTS

After screening, a total of 599 valid publications were included in this study, with a significant upward trend in the number of publications. These studies were from 68 countries/regions with the United States and the United Kingdom making the largest contributions to the field. 4,806 research scholars from 493 institutions conducted studies on pharmacovigilance for rare diseases. Harvard University and University of California were the top two productive institutions in the research field. He Dian of the Affiliated Hospital of Guizhou Medical University and Peter G.M. Mol of the University of Groningen, The Netherlands, were the two most prolific researchers. The Cochrane Database of Systematic Reviews and the New England Journal of Medicine were the journals with the highest number of articles and co-citation frequency respectively. Clinical trial, therapy and adverse event were the top three most cited keywords.

CONCLUSIONS

Based on keywords co-occurrence analysis, four research topics were identified: orphan drug clinical trials, postmarketing ADR surveillance for orphan drugs, rare diseases and orphan drug management, and diagnosis and treatment of rare diseases. Immune-related adverse reactions and benefit-risk assessment of enzyme replacement therapy were at the forefront of research in this field. Treatment outcomes, early diagnosis and natural history studies of rare diseases may become hotspots for future research.

Characteristics of drug safety alerts issued by the Spanish Medicines Agency

Objectives: To describe the characteristics of safety alerts issued by the Spanish Medicines Agency (AEMPS) and the Spanish Pharmacovigilance System over a 7-year period and the regulatory actions they generated. Methods: A retrospective analysis was carried out of drug safety alerts published on the AEMPS website from 1 January 2013 to 31 December 2019. Alerts that were not drug-related or were addressed to patients rather than healthcare professionals were excluded. Results: During the study period, 126 safety alerts were issued, 12 of which were excluded because they were not related to drugs or were addressed to patients and 22 others were excluded as they were duplications of previous alerts. The remaining 92 alerts reported 147 adverse drug reactions (ADRs) involving 84 drugs. The most frequent source of information triggering a safety alert was spontaneous reporting (32.6%). Four alerts (4.3%) specifically addressed health issues related to children. ADRs were considered serious in 85.9% of the alerts. The most frequent ADRs were hepatitis (seven alerts) and congenital malformations (five alerts), and the most frequent drug classes were antineoplastic and immunomodulating agents (23%). Regarding the drugs involved, 22 (26.2%) were "under additional monitoring." Regulatory actions induced changes in the Summary of Product Characteristics in 44.6% of alerts, and in eight cases (8.7%), the alert led to withdrawal from the market of medicines with an unfavorable benefit/risk ratio. Conclusion: This study provides an overview of drug safety alerts issued by the Spanish Medicines Agency over a 7-year period and highlights the contribution of spontaneous reporting of ADRs and the need to assess safety throughout the lifecycle of medicines.

Dissemination of Direct Healthcare Professional Communications on Medication Errors for Medicinal Products in the EU: An Explorative Study on Relevant Factors

INTRODUCTION

When serious medication errors (ME) are identified, communication to the field may be necessary. In the EU, communication of serious safety issues, such as medication errors associated with adverse drug reactions, is done through direct healthcare professional communications (DHPCs). We aimed to identify how often DHPCs about medication errors are distributed, and we explored factors associated with these ME DHPCs.

METHODS

We performed a descriptive study of all centrally authorised products (CAPs) approved before 1 May 2019 in the EU. All DHPCs issued between 1 January 2001 and 1 May 2019 were reviewed for ME content. Characteristics of CAPs were collected from the website of the European Medicines Agency. A Kaplan-Meier survival analysis was performed to estimate the 5- and 10-year probability of the occurrence of a first ME DHPC. A logistic regression was performed to explore risk factors for ME DHPCs.

RESULTS

A total of 678 CAPs were included, of which 35 required an ME DHPC during the study period. The 5-year probability for a CAP to have a first ME DHPC was 2.5% (95% CI 1.1-3.9) and the 10-year probability was 4.4% (95% CI 2.2-6.5). Among products with an ME DHPC, the 5-year probability of a second ME DHPC was 21.3% (95% CI 0.2-38.0). The risk of ME DHPCs was increased for products with multiple pharmaceutical formulations, enteral liquid or parenteral injection preparations, and products classified as nervous system agents or antineoplastic and immunomodulating agents.

CONCLUSIONS

The absolute number of ME DHPCs for CAPs is low and does not give rise to immediate concern. We identified potential risk factors for ME DHPCs that should be taken into account during approval procedures or line extensions.

Postmarket Safety Communication for Protection of Public Health: A Comparison of Regulatory Policy in Australia, Canada, the European Union, and the United States

In the wake of the withdrawal of the nonsteroidal anti-inflammatory drug rofecoxib, regulators worldwide reconsidered their approach to postmarket safety. Many have since adopted a "life cycle" approach to regulation of medicines, facilitating faster approval of new medicines while planning for potential postmarket safety issues. A crucial aspect of postmarket safety is the effective and timely communication of emerging risk information using postmarket safety advisories, commonly issued as letters to healthcare professionals, drug safety bulletins, media alerts, and website announcements. Yet regulators differ in their use of postmarket safety advisories. We examined the capacity of regulators in the United States, Europe, Canada, and Australia to warn about postmarket safety issues through safety advisories by assessing their governance, legislative authority, risk communication capabilities, and transparency.

Introduction or Discontinuation of Additional Risk Minimisation Measures During the Life Cycle of Medicines in Europe

Introduction

Additional risk minimisation measures (aRMMs) may be required to minimise important risks of medicines. aRMMs may be required at the time of authorisation, but may also be introduced or discontinued during the product life cycle as new safety information arises. The aim of this study is to describe post-authorisation introductions of new aRMMs and discontinuations of existing aRMMs for medicines authorised in the European Union (EU).

Methods

We performed a retrospective cohort study that included all new active substances authorised through the EU centralised procedure between January 1st 2006 and December 31st 2017. Data was extracted from European Public Assessment Reports available on the website of the European Medicines Agency (ema.europa.eu). Medicines were followed up from the date of marketing authorisation (MA) until first introduction or discontinuation of aRMMs, excluding Direct Healthcare Professional Communications (DHPCs), withdrawal/suspension/revocation of the MA, or July 1st 2018, when data extraction took place. Descriptive statistics were used to analyse frequency data, and survival analysis was used to calculate 5- and 10-year probability of introduction or discontinuation of aRMMs.

Results

A total of 476 medicines were authorised during the study period. The probability of getting aRMMs after authorisation for products authorised without aRMMs was 3.5% [95% confidence interval (CI) 1.2–5.7] within 5 years after authorisation and 6.9% (95% CI 2.6–11) within 10 years after authorisation. For products authorised with aRMMs, the probability of discontinuation of aRMMs was 0.9% (95% CI 0–2.6) within 5 years and 8.3% (95% CI 0–16.1) within 10 years after authorisation.

Conclusions

We found low probabilities of introduction and discontinuation of aRMMs (excluding DHPCs) during the product life cycle for medicines authorised between 2006 and 2017. The low rate of discontinuation may potentially be due to a lack of robust data on effectiveness of aRMMs. Further research is needed to get more insight into the dynamics of aRMMs during the medicine life cycle.

Are monitoring instructions provided in direct healthcare professional communications (DHPCs) of sufficient quality? A retrospective analysis of DHPCs sent out between 2007 and 2018

OBJECTIVE

To assess whether direct to healthcare professional communications (DHPCs) are of sufficient quality to be applicable in clinical practice and study how the quality differs according to safety concerns and type of monitoring.

DESIGN

Retrospective cohort study.

SETTING

DHPCs containing monitoring instructions were identified among all DHPC issued in Denmark between 2007 and 2018.

INTERVENTION

Quality of information of monitoring instructions was assessed according to the Systematic Information for Monitoring (SIM) score. Associations between different characteristics of instructions and the SIM score were compared with analysis of variance and the post hoc test Tukey's honestly significant difference if significant.

RESULTS

In total, 297 DHPCs were issued, of which 97 contained 134 monitoring instructions. For 95% of these DHPCs the European Medicines Agency was involved. The average SIM score was 2.6±1.6 (ranging 0-6) and only 47% were considered of sufficient quality (SIM score ≥3). In addition, even fewer (11%) instructions were considered a 'adequate instruction' which also reported about facts and risks. Differences between quality of information according to type of monitoring were observed, specifically between clinical monitoring (average SIM score 1.9) and biomarker monitoring (physical average SIM score 2.9, p=0.029 and laboratory average SIM score 3.4, p<0.0001).

CONCLUSIONS

Monitoring instructions were found not to be of sufficient quality to be applicable in clinical practice according to the SIM score. Our study concludes the need for further research and regulatory steps to ensure improve quality of information in safety communications.

Drug Safety Issues Covered by Lay Media: A Cohort Study of Direct Healthcare Provider Communications Sent between 2001 and 2015 in The Netherlands

Background

Some drug safety issues communicated through direct healthcare professional communications (DHPCs) receive substantial media coverage, while others do not.

Objectives

The objective of this study was to assess the extent of coverage of drug safety issues that have been communicated through DHPCs in newspapers and social media. A secondary aim was to explore which determinants may be associated with media coverage.

Methods

Newspaper articles covering drug safety issues communicated through 387 DHPCs published between 2001 and 2015 were retrieved from LexisNexis Academic™. Social media postings were retrieved from Coosto™ for drugs included in 220 DHPCs published between 2010 and 2015. Coverage of DHPCs by newspapers and social media was assessed during the 2-month and 14-day time periods following issuance of the DHPC, respectively. Multivariate logistic regression was used to assess potential DHPC- and drug-related determinants of media coverage.

Results

41 (10.6%) DHPC safety issues were covered in newspaper articles. Newspaper coverage was associated with drugs without a specialist indication [adjusted odds ratio 5.32; 95% confidence interval (2.64–10.73)]. Negative associations were seen for time since market approval [3–5 years 0.30; (0.11–0.82), 6–11 years 0.18; (0.06–0.58)] and year of the DHPC [0.88; (0.81–0.96)]. In the social media, 180 (81.8%) drugs mentioned in 220 DHPCs were covered. Social media coverage was associated with drugs without a specialist indication [6.92; (1.56–30.64)], and for DHPCs communicating clinical safety issues [5.46; (2.03–14.66)].

Conclusions

Newspapers covered a small proportion of DHPC safety issues only. Most drugs mentioned in DHPCs were covered in social media. Coverage in both media were higher for drugs without a specialist indication.

Electronic supplementary material

The online version of this article (10.1007/s40264-020-00922-7) contains supplementary material, which is available to authorized users.

Comparative, cross-sectional study of the format, content and timing of medication safety letters issued in Canada, the USA and the UK

OBJECTIVES

To assess consistency in the format and content, and overlap of subject and timing, of medication safety letters issued by regulatory health authorities to healthcare providers in Canada, the USA and the UK.

DESIGN

A cross-sectional study comparing medication safety letters issued for the purpose of alerting healthcare providers to newly identified medication problems associated with medications already on the market.

SETTING

Online databases operated by Health Canada, the US Food and Drug Administration and the UK Medicines and Healthcare products Regulatory Agency were searched to select medication safety letters issued between 1 January 2010 and 31 December 2014. Format, content and timing of each medication safety letter were assessed using an abstraction tool comprising 21 characteristics deemed relevant by consensus of the research team.

MAIN OUTCOME MEASURES

Main outcome measures included, first, characteristics (format and content) of medication safety letters and second, overlap of subject and release date across countries.

RESULTS

Of 330 medication safety letters identified, 227 dealt with unique issues relating to medications available in all three countries. Of these 227 letters, 21 (9%) medication problems were the subject of letters released in all three countries; 40 (18%) in two countries and 166 (73%) in only one country. Only 13 (62%) of the 21 letters issued in all three countries were released within 6 months of each other.

CONCLUSIONS

Significant discrepancies in both the subject and timing of medication safety letters issued by health authorities in three countries (Canada, the USA and the UK) where medical practice is otherwise comparable, raising questions about why, how and when medication problems are identified and communicated to healthcare providers by the authorities. More rapid communication of medication problems and better alignment between authorities could enhance patient safety.

Prescribing Variation in General Practices in England Following a Direct Healthcare Professional Communication on Mirabegron

Introduction: Pharmacovigilance may detect safety issues after marketing of medications, and this can result in regulatory action such as direct healthcare professional communications (DHPC). DHPC can be effective in changing prescribing behaviour, however the extent to which prescribers vary in their response to DHPC is unknown. This study aims to explore changes in prescribing and prescribing variation among general practitioner (GP) practices following a DHPC on the safety of mirabegron, a medication to treat overactive bladder (OAB). Methods: This is an interrupted time series study of English GP practices from 2014–2017. National Health Service (NHS) Digital provided monthly statistics on aggregate practice-level prescribing and practice characteristics (practice staff and registered patient profiles, Quality and Outcomes Framework indicators, and deprivation of the practice area). The primary outcome was monthly mirabegron prescriptions as a percentage of all OAB drug prescriptions and we assessed the change following a DHPC issued by the European Medicines Agency in September 2015. The DHPC stated mirabegron use was contraindicated with severe uncontrolled hypertension and cautioned with hypertension. Variation between practices in mirabegron prescribing before and after the DHPC was assessed using the systematic component of variation (SCV). Multilevel segmented regression with random effects quantified the change in level and trend of prescribing after the DHPC. Practice characteristics were assessed for their association with a reduction in prescribing following the DHPC. Results: This study included 7408 practices. During September 2015, 88.9% of practices prescribed mirabegron and mirabegron comprised a mean of 8.2% (SD 6.8) of OAB prescriptions. Variation between practices was classified as very high and the median SCV did not change significantly (p = 0.11) in the six months after the September 2015 DHPC (12.4) compared to before (11.6). Before the DHPC, the share of mirabegron over all OAB drug prescriptions increased by 0.294 (95% confidence interval (CI), 0.287, 0.301) percentage points per month. There was no significant change in the month immediately after the DHPC (−0.023, 95% CI −0.105 to 0.058), however there was a significant reduction in trend (−0.036, 95% CI −0.049 to −0.023). Higher numbers of registered patients, patients aged ≥65 years, and practice area deprivation were associated with having a significant decrease in level and slope of mirabegron prescribing post-DHPC. Conclusion: Variation in mirabegron prescribing was high over the study period and did not change substantively following the DHPC. There was no immediate prescribing change post-DHPC, although the monthly growth did slow. Knowledge of the degree of variation in and determinants of response to safety communications may allow those that do not change prescribing habits to be provided with additional support.

Communication on Safety of Medicines in Europe: Current Practices and General Practitioners' Awareness and Preferences

Introduction

National competent authorities (NCAs) for medicines coordinate communication relating to the safety of medicines in Europe. The effectiveness of current communication practices has been questioned, particularly with regard to reaching general practitioners (GPs).

Objective

The aim of this study was to assess current European NCA safety communication practices and to investigate European GPs’ awareness of and preferences for safety communications on medicines.

Methods

Web-based surveys were distributed among European NCAs and healthcare professionals (HCPs). The survey among regulators was emailed to a representative of each of the 27 European countries participating in the Strengthening Collaboration for Operating Pharmacovigilance in Europe (SCOPE) Joint Action. HCPs from nine European countries (Denmark, Spain, Croatia, Ireland, Italy, The Netherlands, Norway, Sweden, and the UK) were asked about their preferences through a link to the survey on websites, in newsletters, and/or in a direct email. From this survey, data from GPs were used and descriptive analyses were conducted.

Results

Current NCA practices were reported for 26 countries. In 23 countries (88%), NCAs published direct healthcare professional communications (DHPCs, i.e. urgent communication letters for serious safety issues) on their website in addition to distribution to individual HCPs. Educational materials were available on the NCA’s website in 10 countries (40%), and 21 NCAs (81%) indicated they had their own bulletin/newsletter, which is often presented on the NCA’s website (15 countries; 60%). More than 90% of the 1766 GPs who completed the survey were aware of DHPCs. The most preferred senders of safety information were NCAs and professional bodies, while the preferred channels for keeping up to date with safety information were medicines reference books and clinical guidelines. GPs found the repetition of safety issues useful (range of 80% in the UK to 97% in Italy). Preference for an electronic copy rather than a hardcopy varied per country (36% in Sweden to 72% in Spain).

Conclusions

NCAs use similar methods for safety communications on medicines. Most GPs were aware of urgent communications and preferred similar senders of safety communications; however, their preferences towards the format differed per country.

Electronic supplementary material

The online version of this article (doi:10.1007/s40264-017-0535-0) contains supplementary material, which is available to authorized users.

Changes in prescribing and healthcare resource utilization after FDA Drug Safety Communications involving zolpidem-containing medications

PURPOSE

Products containing the sedative/hypnotic zolpidem were subject to Drug Safety Communications (DSCs) in January and May 2013 describing the risk of next-morning impairment and recommending lower starting doses particularly for women. This study aimed to assess whether zolpidem DSCs were associated with prescribing-pattern changes between January 2011 and December 2013.

METHODS

We assessed overall dispensings of zolpidem-containing products between January 2011 and December 2013 by conducting a time-series analysis. Analyses were stratified by gender because the DSC contained gender-specific information. Participants were patients drawn from the Optum Clinformatics data source of commercially insured people in the USA. We evaluated changes in mean prescribed dose of the two drugs and health care utilization metrics.

RESULTS

Each month of the study, more than 80 000 patients received a zolpidem-containing product and approximately one-tenth as many received eszopiclone. The two DSCs did not affect the downward trajectory of new zolpidem prescriptions. However, there was an increase in use of lower-dose forms of zolpidem (30% increase, p < 0.001), coupled with a reduction in higher-dose forms (13% decrease, p = 0.03), so that the average dose decreased after the DSCs (from 9.7 mg to 9.4 mg, p < 0.001), a change that was not seen with eszopiclone (from 2.74 mg to 2.74 mg, p = 0.45).

CONCLUSION

The DSCs related to zolpidem-containing products shifted prescribing toward the lower-dose formulations, consistent with the recommendations in the DSCs. Copyright © 2017 John Wiley & Sons, Ltd.

Postmarketing Safety Events Relating to New Drugs Approved in Brazil Between 2003 and 2013: A Retrospective Cohort Study

This study investigated postmarketing safety events (PMSEs) for new drugs approved in Brazil and evaluated whether a range of drug characteristics influenced the time between approval and the first PMSE. This retrospective study included new drugs registered between 2003 and 2013 by the National Health Surveillance Agency (ANVISA), which is responsible for medicines approval in Brazil. PMSEs were defined as any drug safety alert or drug withdrawal from the market. The existence of risk evaluation and mitigation strategies (REMS) by the US Food and Drug Administration (FDA) and Brazil were recorded. A Kaplan-Meier survival curve of the period between the date of ANVISA registration and the PMSE was calculated. We found a statistically significant difference between the time to PMSE for drugs with an FDA REMS compared with those without a REMS, with a log rank value (Mantel Cox) of 0.002. There was no association between the time to PMSE and the other drug characteristics investigated. This study demonstrated that the frequency of PMSEs for new drugs approved by ANVISA was statistically associated with the existence of an FDA REMS. The time between approval and first PMSE was shorter for drugs with an FDA REMS, and this finding may contribute to improved awareness of the risk/benefit balance required to ensure continued safe and effective use of new drugs.

Prescription behavior for gastroprotective drugs in new users as a result of communications regarding clopidogrel - proton pump inhibitor interaction

Safety concerns of the concomitant use of clopidogrel and proton pump inhibitors (PPIs) were published in 2009 and 2010 by the medicines regulatory agencies, including a direct healthcare professional communication. We examined the association between various safety statements and prescription behavior for gastroprotective drugs in naïve patients in the Netherlands during the years 2008–2011. Data from the PHARMO Database Network were analyzed with interrupted time series analyses to estimate the impact of each communication on drug prescriptions. Dispensings were used as a proxy variable for prescription behavior. After the early communication in January 2009, 15.5% (95% CI 7.8, 23.4) more patients started concomitantly with (es)omeprazole and 13.8% (95% CI 6.5, 21.2) less with other PPIs. Directly after the first statement in June 2009, we found a steep increase in histamine 2‐receptor antagonists (H2RA) peaking at 25%, placing those patients at risk for gastrointestinal events. This effect for H2RA faded away after a few months. In February 2010, when the official advice via an adjusted statement was to avoid (es)omeprazole, we found a decrease of 11.9% (95% CI 5.7, 18.2) for (es)omeprazole and an increase of +16.0% (95% CI 10.3, 21.7) for other PPIs. Still 22.6% (95% CI 19.5, 25.7) of patients started on (es)omeprazole in February 2010, placing them at risk for cardiovascular events. Advices of regulatory authorities were followed, however, reluctantly and not fully, probably partly because of the existing scientific doubt about the interaction.

Safety Alerts: An Observational Study in Portugal

PURPOSE

The information that is available when marketing authorizations are approved is limited. Pharmacovigilance has an important role during the postauthorization period, and alerts published by national authorities allow health care professionals to be informed about new data on safety profiles. This study therefore sought to analyze all safety alerts published by the Portuguese National Authority of Medicines and Health Products I.P. (INFARMED).

METHODS

We conducted an observational study of all alerts published on the INFARMED website from January 2002 through December 2014. From the data included in the alerts, the following information was abstracted: active substance name (and trade name), event that led to the alert, and the resulting safety measures. Active substances were classified according to the Anatomical Therapeutic Chemical (ATC) code.

FINDINGS

A total of 562 alerts were published, and 304 were eligible for inclusion. The musculoskeletal system was the ATC code with more alerts (n = 53), followed by the nervous system (n = 42). Communication of the information and recommendations to the health care professionals and the public in general was the most frequent safety measure (n = 128), followed by changes in the Summary of the Product Characteristics and package information leaflet (n = 66). During the study period, 26 marketing authorizations were temporarily suspended and 10 were revoked.

IMPLICATIONS

The knowledge of the alerts published during the postmarketing period is very useful to the health care professionals for improving prescription and use of medicines and to the scientific community for the development of new researches.

Are ECG monitoring recommendations before prescription of QT-prolonging drugs applied in daily practice? The example of haloperidol

PURPOSE

Monitoring of the QT duration by electrocardiography (ECG) prior to treatment is frequently recommended in the label of QT-prolonging drugs. It is, however, unknown how often general practitioners in daily clinical practice are adhering to these risk-minimization measures. We assessed the frequency of ECG measurements in patients where haloperidol was initiated in primary care.

METHODS

Patients (≥18 years) with a first prescription of haloperidol in the UK Clinical Practice Research Datalink (2009-2013) were included. The proportion of ECGs made was determined in two blocks of 4 weeks: during the exposure period when haloperidol was initiated, and during the control period, 1 year before. Conditional logistic regression analysis was applied to calculate the relative risk of having an ECG in the exposure period compared with the control period. Subgroup analyses were performed to assess the proportion of ECG measurements in patients with one or more additional risk factors for QT prolongation.

RESULTS

In total, 3420 patients were prescribed haloperidol during the exposure period, and 1.8% of them had an ECG at treatment initiation, compared with 0.8% during the control period (relative risk [RR] 2.4 [1.5-3.8]). Of the patients with additional risk factors for QT prolongation, 1.9% of the patients had an ECG at initiation of the prescription, compared with 1.0% during the control period (RR 2.1 [1.2-3.5]).

CONCLUSIONS

Compliance with recommendations to perform an electrocardiogram when starting a new QT-prolonging drug is extremely low, when haloperidol is taken as an example.

Inconsistencies among European Union pharmaceutical regulator safety communications: a cross-country comparison

Background

The European Medicines Agency (EMA) and national regulators share the responsibility to communicate to healthcare providers postmarketing safety events but little is known about the consistency of this process. We aimed to compare public availability of safety-related communications and drug withdrawals from the EMA and European Union member countries for novel medicines.

Methods and Findings

We performed a cross-sectional analysis using public Dear Healthcare Professional Communications (DHPCs) for all novel medicines authorized between 2001 and 2010 by the EMA and available for use in France, Netherlands, Spain, and the United Kingdom. Between 2001 and 2010, the EMA approved 185 novel medicines. DHPCs could not be ascertained for the EMA. Among the 4 national regulators, as of April 30, 2013, at least one safety DHPC or withdrawal occurred for 53 (28.6%) medicines, totaling 90 DHPCs and 5 withdrawals. Among these 53 medicines, all 4 national agencies issued at least one communication for 17 (32.1%), three of the four for 25 (47.2%), two of the four for 6 (11.3%), and one of the four for 5 (9.4%). Five drugs were reported to be withdrawn, three by all four countries, one by three and one by two. Among the 95 DHPCs and withdrawals, 20 (21.1%) were issued by all 4 national regulators, 37 (38.9%) by 3 of the 4, 22 (23.2%) by 2 of the 4, and 16 (16.8%) by one. Consistency of making publicly available all identified safety DHPC or withdrawal across regulator pairs varied from 33% to 73% agreement.

Conclusions

Safety communications were not made publicly available by the EMA. Among the 4 European member countries with national regulators that make DHPCs publicly available since at least 2001, there were substantial inconsistencies in safety communications for novel medicines. The impact of those inconsistencies in terms of public health remains to be determined.

Post-approval safety issues with innovative drugs: a European cohort study

BACKGROUND

At time of approval, knowledge of the full benefit risk of any drug is limited, in particular with regards to safety. Post-approval surveillance of potential drug safety concerns is recognized as an important task of regulatory agencies. For innovative, often first-in-class drugs, safety knowledge at time of approval is often even less extensive and these may require tighter scrutiny post approval.

OBJECTIVE

We evaluated whether more post-approval serious safety issues were identified for drugs with a higher level of innovation.

METHODS

A cohort study was performed that included all new active substances approved under the European Centralized Procedure and for which serious safety issues were identified post-approval from 1 January 1999 to 1 January 2012. Serious safety issues were defined as issues requiring a Direct Healthcare Professional Communication to alert individual healthcare professionals of a new serious safety issue, or a safety-related drug withdrawal. Data were retrieved from publicly available websites of the Dutch Medicines Evaluation Board and the European Medicines Agency. The level of innovation was scored using a validated algorithm, grading drugs as important (A), moderate (B) or modest (C) innovations or as pharmacological or technological (pharm/tech) innovations. The data were analyzed using appropriate descriptive statistics and Kaplan-Meier analysis, with a Mantel-Cox log-rank test, and Cox-regression models correcting for follow-up duration, to identify a possible trend in serious safety issues with an increasing level of innovation.

RESULTS

In Europe, 279 new drugs were approved between 1999 and 2011. Fifty-nine (21 %) were graded as important, 63 (23 %) moderate, or 34 (12 %) modest innovations and 123 (44 %) as non-innovative (pharm/tech), while 15 (25 %), 13 (21 %), 8 (24 %) and 17 (14 %) had post-approval safety issues, respectively (p = 0.06, linear-by-linear test). Five drugs were withdrawn from the market. The Kaplan-Meier-derived probability for having a first serious safety issue was statistically significant, log-rank (Mantel-Cox) p = 0.036. In the final adjusted Cox proportional hazard model there was no statistically significant difference in occurrence of a first serious safety issue for important, moderate and modest innovations versus non-innovative drugs; hazard ratios 1.76 (95 % CI 0.82-3.77), 1.61 (95 % CI 0.76-3.41)], and 1.25 (95 % CI 0.51-3.06), respectively.

CONCLUSION

A higher level of innovation was not clearly related to an increased risk of serious safety issues identified after approval.

Differences between post-authorization adverse drug reactions of biopharmaceuticals and small molecules

BACKGROUND

The nature of adverse drug reactions observed post-authorization for biopharmaceuticals differs from that observed for chemically synthesized, small molecules (SMs). However, it remains unclear how much of the observed differences can be attributed to differences in authorized indications of the two product groups.

OBJECTIVE

To investigate if the nature of adverse drug reactions identified post-authorization for biopharmaceuticals differs from those of SMs within the same anatomical therapeutic chemical (ATC) group.

METHODS

We analyzed safety issues included in post-authorization, changes to the Summary of Product Characteristics of centrally approved products in the European Union classified in the ATC main group of 'antineoplastic and immunomodulating agents'. Generics and biosimilars were excluded. All issues identified during 2004-2011 were analyzed for differences in nature and timing between biopharmaceutical and SM products, at different ATC levels.

RESULTS

A total of 747 adverse drug reactions were identified; 361 for biopharmaceuticals and 386 for SMs. Within the sub group of immunosuppressants, neoplasms (20 % vs 2 %, p < 0.01) and infections and infestations (22 % vs 9 %, p < 0.01) occurred significantly more frequent for biopharmaceuticals. Adverse drug reactions of SMs were more often renal and urinary disorders (7 % vs 0 %, p < 0.01), blood and lymphatic system disorders (10 % vs 3 %, p = 0.04), and vascular disorders (7 % vs 1 %, p = 0.02). In the subgroup of antineoplastics, immune system disorders occurred more frequently for biopharmaceuticals, (6 % vs 1 %, p = 0.04). With the exception of immune system disorders and renal disorders, the overall differences between biopharmaceuticals and SMs were mostly caused by products authorized as immunosuppressants. For the subset of products authorized after 2004, the median time to the first safety issue was 18 months (95 % CI 12.4-21.5) for biopharmaceuticals and 17 months (95 % CI 12.5-21.5) for SMs and did not differ significantly within subgroups.

CONCLUSION

Even within a group of medicinal products approved in the same indication, differences were observed in the nature of adverse drug reactions between biopharmaceuticals and SMs. The considerable differences in the nature of adverse drug reactions between biopharmaceuticals and SMs were not associated with differences in the timing of regulatory actions.

The role of Periodic Safety Update Reports in the safety management of biopharmaceuticals

PURPOSE

To describe and assess the outcomes of Periodic Safety Update Report (PSUR) evaluations of biopharmaceuticals.

METHODS

A cross-sectional analysis was performed of follow-up requirements of PSURs submitted for centrally approved biopharmaceuticals in the European Union between 1 July 2008 and 30 June 2010. A follow-up analysis on a subset of products that submitted multiple PSURs within the study period was also performed.

RESULTS

The cross-sectional analysis included 70 PSURs. Potential safety concerns occurred in 57 (83 %) of all PSURs, and 26 (37 %) concluded a need to change the Summary of Product Characteristics (SPC). In comparison to newer products, products authorized for more than 10 years contained significantly fewer potential safety concerns (60 vs. 92 %; p < 0.01) and required fewer SPC changes (15 vs. 46 %; p = 0.03). For 45 products, multiple PSURs were submitted that could be included in a follow-up analysis. For this subset of products, of the 106 newly identified safety potential safety issues, 7 (7%) resulted in requirements for label changes in the following PSUR.

CONCLUSIONS

PSURs facilitate communication between regulators and marketing authorization holders. Potential safety concerns occur for the majority of biopharmaceuticals and throughout their lifecycle, but for established products PSUR evaluations rarely lead to regulatory actions.

When direct health-care professional communications have an impact on inappropriate and unsafe use of medicines

Serious safety issues relating to drugs are communicated to health-care professionals via Direct Health-Care Professional Communications (DHPCs). We explored which characteristics determined the impact of DHPCs issued in the Netherlands for ambulatory-care drugs (2001-2008). With multiple linear regression, we examined the impact on the relative change in new drug use post-DHPC of the following: time to DHPC, trend in use, degree of innovation, specialist drug, first/repeated DHPC, DHPC template, and type of safety issue. DHPCs have less impact on use of specialist drugs than nonspecialist drugs (P < 0.05). The DHPCs' impact increased after availability of a template emphasizing the main problem (P < 0.05), and for safety issues with a risk of death and/or disability (both P < 0.05) (adjusted R² = 0.392). Risk communication can be effective, specifically in case of well-structured information, and very serious safety issues. Effectiveness may improve by tailoring DHPCs and adding other communication channels, for example for drugs that are increasingly being used.

The ability of animal studies to detect serious post marketing adverse events is limited

The value of animal studies to assess drug safety is unclear because many such studies are biased and have methodological shortcomings. We studied whether post-marketing serious adverse reactions to small molecule drugs could have been detected on the basis of animal study data included in drug registration files. Of 93 serious adverse reactions related to 43 small molecule drugs, only 19% were identified in animal studies as a true positive outcome, which suggests that data from animal studies are of limited value to pharmacovigilance activities. Our study shows that drug registration files can be used to study the predictive value of animal studies and that the value of animal studies in all stages of the drug development should be investigated in a collaborative endeavour between regulatory authorities, industry, and academia.

Is spontaneous reporting always the most important information supporting drug withdrawals for pharmacovigilance reasons in France?

PURPOSE

The objective of our study was to determine the nature of scientific evidence leading to drug withdrawal for safety reasons in France (between 2005 and 2011).

METHODS

Drugs (i.e., active ingredients) withdrawn were identified from the Web site of the French Health Products Agency. Additional information allowed us to classify these withdrawals according to the nature of evidence as clinical trials (CT), case reports/case series (CR/CS), case-control studies (CC), cohort, animal, or observational studies.

RESULTS

A total of 22 active ingredients were withdrawn from the French market between 2005 and 2011. The nature and type of adverse drug reactions (ADRs) leading more frequently to drug withdrawal were cardiovascular (10-fold), neurological (5-fold), or hepatic, cutaneous, or psychiatric (3-fold each) ADRs. CR (19/22; 86.4%) and CT (13/22; 59.1%) were the most frequently involved methods. In 5 of 22 (23%) cases, CR were the sole evidence. However, 68% (15/22) of regulatory decisions were based on multiple sources of evidence: For example, data from CR + CT were used in eight cases. CC or cohort studies were used in only five cases.

CONCLUSION

This study underlines that spontaneous reporting remained the most important source of drug withdrawals between 2005 and 2011. However, its relative importance decreased in comparison with that in 1997-2004. The importance of pharmacoepidemiological methods slightly increased but remained low. Finally, regulatory authorities seem to have more frequently based their safety decisions on multiple sources of evidence than before.

Prescribing of rosiglitazone and pioglitazone following safety signals: analysis of trends in dispensing patterns in the Netherlands from 1998 to 2008

BACKGROUND

Relevant safety signals in the EU are regularly communicated in so-called 'Direct Healthcare Professional Communications' (DHPCs) or European Medicines Agency (EMA) press releases. Trends of a decrease in the use of rosiglitazone following regulatory safety warnings have been described in the US. In the EU, however, relatively little is known about dispensing patterns following DHPCs or other safety signals such as EMA press releases.

OBJECTIVE

The objective of this study was to analyse trends in dispensing patterns of rosiglitazone and pioglitazone following DHPCs and EMA press releases in the EU member state, the Netherlands.

METHODS

Data for this study were obtained from the PHARMO Record Linking System, which includes drug dispensing records from community pharmacies of approximately 2.5 million individuals in the Netherlands. Over the period 1998-2008 an auto-regressive, integrated, moving average model (ARIMA) was fitted. The DHPC letters or EMA press releases were used as determinants. Adjustments were made for publication of certain literature. Stratification was performed for dispensings prescribed by general practitioners (GPs) and those prescribed by specialists.

RESULTS

For rosiglitazone, four EMA press releases and two DHPCs were issued; for pioglitazone, one DHPC was issued. The number of rosiglitazone dispensings prescribed by GPs decreased significantly after publication of DHPCs and EMA press releases concerning the risk of macular oedema and risk of fractures (both p-values 0.001). The number of rosiglitazone dispensings decreased statistically significantly after publication of EMA press releases 2 and 3 concerning cardiovascular risks but not for EMA press release 4. Adjustment for certain publications in the literature reduced the effect of communicated safety issues on the proportion of dispensings.

CONCLUSIONS

Although it is difficult to disentangle the effect of DHPCs and EMA press releases from the effect of reports published in the literature, our results suggest that prescribers may react to such safety communications.

Risk management of biosimilars in oncology: each medicine is a work in progress

Drug licensing and drug safety monitoring for standard chemical entities have been established and are routinely used. These have resulted in a solid foundation of knowledge from which confident therapeutic decisions can be made. For many chemical entities, this advanced level of experience is also present for the generic products. The expertise surrounding the development of biosimilar competitor versions is increasing and progress is encouraging. To address the re-engineering and comparability complexities of biosimilars, the European Union imposed a requirement that risk management plans be included in the medications’ marketing applications. This paper summarizes and discusses the circumstances complicating the public’s view of drug safety, historical incidents during the transition from innovative to competitor products, as well as retrospective assessments of the development and post-marketing experiences thus far with two biosimilars. Through assessing the market entries and post-marketing experiences of biosimilars used in oncology, the healthcare field can better prepare for the next wave of comparator-products: biosimilar monoclonal antibodies.

Effect of safety issues with HIV drugs on the approval process of other drugs in the same class: an analysis of European Public Assessment Reports

BACKGROUND

Knowledge on the safety of new medicines is limited at the time of market entry. Nearly half of all drugs used to treat HIV registered in the EU required ≥1 Direct Healthcare Professional Communication (DHPC) in the past 10 years for safety issues identified post-approval.

OBJECTIVE

The aim was to evaluate the extent to which regulators and industry have addressed the risk of safety issues for HIV drugs based on prior experience with other drugs in the same class and whether doing so impacts development time of these drugs.

METHODS

HIV drugs receiving ≥1 DHPC in the Netherlands between January 1999 and December 2008 were identified. Each drug with a DHPC ('index' drug) was paired with subsequently approved HIV drug(s) in the same class (Anatomical Therapeutic Chemical [ATC] 4th level) ['follow-on' drugs]. Characteristics of safety issues were extracted from the DHPCs of the 'index' drugs. European Public Assessment Reports (EPARs) were reviewed regarding whether the safety issues had been considered during development and approval. Consideration of previously identified safety issues in 'follow-on' drug applications was assessed regarding attention paid to adverse drug reaction (ADR) symptoms in pre-marketing studies, Summary of Product Characteristics (SmPC) and postmarketing commitments, and whether size of the safety population was in accordance with Regulatory guidelines. 'Index' drugs were also paired with drugs in the same class already on the market ('older' drugs). For 'older' drugs, we identified whether the safety issue led to appropriate changes in the current SmPC (January 2011) compared with the SmPC at the time of marketing authorization. Clinical development time was assessed using time from first patent application to market authorization as proxy, and comparison was made between 'index' and 'follow-on' drugs.

RESULTS

For 9 (43%) of the 21 centrally authorized HIV drugs, 11 serious safety issues that required a DHPC were identified. Two drugs were excluded from our analysis (DHPCs related to contamination/medication error). Six 'index' drugs were paired, each with one to six 'follow-on' drugs. Three concerned drug-drug interactions (DDIs); the other three were intracranial haemorrhage, neuromuscular weakness and severe skin/hepatic reactions. All but one 'follow-on' drug had information in the EPAR on that specific ADR (i.e. attention was paid to the ADR). The DDIs were addressed in pre-marketing studies and/or the SmPC. Two of the other ADRs were addressed by postmarketing surveillance commitments; intracranial haemorrhage was not addressed. Three safety issues for two 'index' drugs could not be paired with a 'follow-on' drug as no drug in the same class was approved after the corresponding DHPCs were issued. Five of the nine safety issues were added to at least one of the current SmPCs for the 'older' drugs already on the market at the time of DHPC issue. Two safety issues were already in the SmPC of the 'older' drugs at time of market approval and two were not introduced into the SmPC of 'older' drugs. Population size to assess short-term safety complied with the guidelines for four 'index', seven 'follow-on' and three 'older' drugs; population size to assess long-term safety complied for one, three and two drugs, respectively. For five drugs, EPARs did not provide adequate information on population size. No statistically significant difference in development time between 'index' and 'follow-on' drugs was found.

CONCLUSION

Generally, safety issues were taken into account in the approval process of other drugs in the class. The approaches were different and determined by the nature of the ADR. Taking safety issues into account in the approval process did not seem to impact on the time taken to perform the pre-approval clinical programme.

Additional safety risk to exceptionally approved drugs in Europe?

AIMS

Regulatory requirements for new drugs have increased. Special approval procedures with priority assessment are possible for drugs with clear 'unmet medical need'. We question whether these Exceptional Circumstances (EC) or Conditional Approval (CA) procedures have led to a higher probability of serious safety issues.

METHODS

A retrospective cohort study was performed of new drugs approved in Europe between 1999 and 2009. The determinant was EC/CA vs. standard procedure approval. Outcome variables were frequency and timing of a first Direct Healthcare Professional Communication (DHPC). An association between approval procedure and the time from market approval to DHPC was assessed using Kaplan-Meyer survival analysis and Cox-regression to correct for covariates.

RESULTS

In total 289 new drugs were approved. Forty-six (16.4%) were approved under EC or CA, of which seven received a DHPC (15%). This was similar to the standard approval drugs (243), of which 33 received one or more DHPC (14%, P= 0.77). The probability of acquiring a DHPC for standard approval drugs vs. EC/CA drugs during 11-year follow-up is 22% (95% CI 14%, 29%) and 26% (95% CI 8%, 44%), respectively (log-rank P= 0.726). This difference remained not significant in the Cox-regression model: hazard ratio 0.94 (95% CI 0.40, 2.20). Only drug type was identified as a confounding covariate.

CONCLUSION

The EC/CA procedure is not associated with a higher probability of DHPCs despite limited clinical development data. These data do not support the view that early drug approval increases the risk of serious safety issues emerging after market approval.

Relevance of a "Dear Doctor letter" to alert healthcare providers to new recommendations for vitamin D administration

PURPOSE

After reports of malaise in infants immediately after the oral administration of two brands of vitamin D solutions, a "Dear Doctor letter" (DDL) containing recommendations for the administration of vitamin D was sent to all French paediatricians and pharmacies and a large number of French general practitioners (GPs) with a predominantly paediatric practice. The DDL and a press release were published on the French Medicines Agency website and distributed via a mailing list. The objective of this study was to assess the effectiveness of such a DDL and to collect the opinions of healthcare professionals on the best way to provide them with information.

METHODS

A questionnaire was sent to a national random sample of 145 paediatricians, 680 GPs and 230 pharmacists.

RESULTS

Only 49% of responding paediatricians, 48% of GPs and 67% of pharmacists were aware of the warning. Among the participating healthcare professionals aware of the warning and who prescribed/dispensed these vitamins, 50% of paediatricians and 68% of GPs stated that they had changed their prescribing behaviour, and 68% of pharmacists stated that they had modified their advice when dispensing. According to the responding healthcare professionals, postal letters remained the best way to issue safety warnings. Some of the respondents suggested that the DDL be more distinctive in terms of being a DDL and that the information be more widely disseminated to other stakeholders involved in the healthcare system.

CONCLUSIONS

This survey of a national random sample of healthcare professionals revealed that many of the respondents paid little attention to the DDL and were therefore unlikely to change their practices. A potential supplementary method for disseminating recommendations for medicine administration could be to apply stickers on medicine boxes, as this approach has the additional advantage of directly informing the concerned population, i.e. the parents.