Aseptic preparation of parenteral medicinal products in healthcare establishments in Europe

Stability of pemetrexed disodium in sodium chloride 0.9% w/v intravenous Viaflo infusion bags

OBJECTIVES

The aim of this study was to assess the stability of pemetrexed disodium (Alimta), reconstituted in 100 mL sodium chloride 0.9% w/v intravenous infusion bags (Baxter Viaflo) at two target bag concentrations (2.0 and 13.5 mg/mL) during storage at 2-8°C for 28 days (protected from light), followed by 24 hours at 25±2°C with 60±5% relative humidity (RH) (protected from light). This study was commissioned by NHS England and NHS Improvement to generate data to aid shelf life extensions for aseptic products compounded in National Health Service (NHS) hospital aseptic facilities.

METHODS

A high performance liquid chromatography (HPLC) assay was developed and validated to monitor pemetrexed concentration and related substance levels in accordance with NHS yellow cover document requirements. This assay and analysis of related substances was used alongside visual inspection, pH monitoring and sub-visible particle count analysis to monitor stability. The stability of three preparations of each concentration of pemetrexed disodium in Viaflo saline bags (0.9% w/v) was assessed at various time points.

RESULTS

Pemetrexed assay concentrations remained >97.0% of initial concentration at all points during the study (including the period at elevated temperature). Appearance remained consistent with the Summary of Product Characteristics, particle count data remained within the British Pharmacopoeia limits, and pH remained within 0.43 units of T=0 at all times. The increases in related substance levels during the study were found to be the limiting factor for shelf life assignment.

CONCLUSION

The data for appearance, pH, sub-visible particle count analysis and pemetrexed assay would support a shelf life of 28 days stored at 2-8°C (protected from light) followed by 24 hours at 25±2°C with 60±5% RH (protected from light). However, given the increase in related substance levels, a shelf life of 21 days stored at 2-8°C (protected from light) was deemed to be appropriate.

Prefilled Cyclic Olefin Sterilized Syringes of Norepinephrine Injection Solution Do Not Need to Be Stabilized by Antioxidants

Norepinephrine is a potent α-sympathomimetic drug which plays an important role in the acute treatment of hypotension and shock. Commercially available norepinephrine solutions contain sodium metabisulfite (Na2S2O5) as an antioxidant. However, prefilled cyclic olefin polymer syringes are not compatible with sodium metabisulfite. The aim of this study was to develop a new formulation of 0.1-mg/mL norepinephrine solution without sodium metabisulfite which is chemically stable and sterile and can be stored in prefilled polymer syringes. Formulation studies were performed with 0.1-mg/mL norepinephrine solution with 0, 0.05, or 0.1% ascorbic acid added as antioxidant. The syringes were filled under nitrogen gassing, stored at 20 ± 5°C, and protected from daylight. Based on the formulation test results, the final formulation was defined and stability testing at 20 ± 5°C was performed measuring norepinephrine concentration, pH, clarity, color of the solution, subvisible particles, and sterility at time intervals up to 12 months. The norepinephrine concentrations at t = 22 weeks were 100.4%, 95.4%, and 92.2% for the formulations with no ascorbic acid and with 0.05% and 0.10% ascorbic acid, respectively. Three batches for the stability study were produced containing norepinephrine, sodium edetate, sodium chloride, and water for injections filled under nitrogen gassing and stored at 20 ± 5°C. Norepinephrine concentrations were respectively 98.8%, 98.6%, and 99.3% for batches 1, 2, and 3 at t = 12 months. It can be concluded that norepinephrine (0.1 mg/mL) solution without metabisulfite is stable for at least 12 months at room temperature when protected from daylight.

Development, Evaluation, and Pharmacokinetic Assessment of Polymeric Microarray Patches for Transdermal Delivery of Vancomycin Hydrochloride

Methicillin-resistant Staphylococcus aureus (MRSA) can cause harmful and potentially deadly infections. Vancomycin remains the first-line antibiotic treatment for MRSA-derived infections. Nevertheless, as a peptide drug, it is poorly absorbed when administered orally because of its high molecular weight and low permeability in the gastrointestinal tract and is therefore administered intravenously for the treatment of systemic diseases. In order to circumvent some of the many drawbacks associated with intravenous injection, other routes of drug delivery should be investigated. One of the strategies which has been employed to enhance transdermal drug delivery is based on microarray patches (MAPs). This work, for the first time, describes successful transdermal delivery of vancomycin hydrochloride (VCL) using dissolving MAPs (DMAPs) and hydrogel-forming MAPs (HFMAPs). VCL was formulated into DMAPs and reservoirs [film dosage forms, lyophilized wafers, and compressed tablets (CSTs)] using excipients such as poly(vinyl pyrrolidone), poly(vinyl alcohol), sodium hyaluronate, d-sorbitol, and glycerol. In this study, HFMAPs were manufactured using aqueous blends containing poly(methylvinyl ether-co-maleic acid) cross-linked by esterification with poly(ethylene glycol). The VCL-loaded CSTs (60% w/w VCL) were the most promising reservoirs to be integrated with HFMAPs based on the physicochemical evaluations performed. Both HFMAPs and DMAPs successfully delivered VCL in ex vivo studies with the percentage of drug that permeated across the neonatal porcine skin recorded at 46.39 ± 8.04 and 7.99 ± 0.98%, respectively. In in vivo studies, the area under the plasma concentration time curve from time zero to infinity (AUC_0-∞) values of 162.04 ± 61.84 and 61.01 ± 28.50 μg h/mL were achieved following the application of HFMAPs and DMAPs, respectively. In comparison, the AUC_0-∞ of HFMAPs was significantly greater than that of the oral administration control group, which showed an AUC_0-∞ of 30.50 ± 9.18 μg h/mL (p < 0.05). This work demonstrates that transdermal delivery of VCL is feasible using DMAPs and HFMAPs and could prove effective in the treatment of infectious diseases caused by MRSA, such as skin and soft tissue infections, lymphatic-related infections, and neonatal sepsis.

Pharmacotherapy of unlicensed medicines prepared and distributed by Dutch pharmacies

Introduction and objective

In the Netherlands, preparing and distributing pharmacies (PDPs) are taking over a large proportion of pharmacy preparations. PDPs prepare and distribute medicinal products to dispensing pharmacies. Many pharmacies have stopped pharmacy preparation. However, this contravenes the Dutch Medicines Act and the European Union (EU) Directive 2001/83/EC on which Dutch law is based. This is because the medicinal products of PDPs are unlicensed and PDPs do not have a manufacturing licence.

Methods

To solve the conflict with the Dutch Medicines Act, PDPs have since 2007 been authorised by the Dutch Health Care Inspectorate by means of a circular letter. This circular letter describes the qualitative conditions that must be fulfilled by PDPs. The circular letter's conditions state that PDPs must perform verifiable investigations to assess the availability, or not, of licensed pharmacotherapeutic alternatives (PA investigations) and to assess the pharmacotherapeutic rationale and the needs of the patient (PT investigations).

Results

Regular visits were performed by the Dutch Health Care Inspectorate to check the compliance of PDPs with the circular letter. This article describes the results of these inspections for PA and PT investigations.

Conclusions

The results of the inspections show that so far almost all PDPs inspected have complied with the PA and PT conditions of the circular level at system level. However, in a substantial proportion of cases, the rationale of the pharmacy-made products is insufficient or insufficiently documented.

A Cost Minimization Analysis of Ready-to-Administer Prefilled Sterilized Syringes in a Dutch Hospital

PURPOSE

Preparation errors occur frequently during conventional preparation of parenteral medication in the clinical environment, causing patient harm and costs for the national health care system. The use of ready-to-administer prefilled sterilized syringes (PFSSs) produced by the hospital pharmacy can reduce preparation errors and the risk of bacteremia from contamination of the intravenous medication. The aim of this research is to compare the total costs of the conventional preparation method (CPM) with the PFSS method.

METHODS

In this cost-minimization analysis, costs related to the preparation of the medication, bacteremia from contamination, adverse drug events as a result of preparation medication errors, and wastage of syringes were taken into account. Annual costs in a general Dutch hospital were consistently calculated. Three scenarios were analyzed: (1) all preparations as CPM (864,246 administrations per year), (2) all preparations as PFSSs, and (3) 50% as PFSSs and 50% as CPM. Deterministic and probabilistic sensitivity analyses were performed.

FINDINGS

The first scenario found higher annual costs at €14.0 million (US$16.0 million) compared with the second scenario (€4.1 million, US$4.7 million). The most realistic situation (third scenario) found savings of €4.9 million (US$5.6 million) compared with the first scenario. Sensitivity analyses revealed that cost savings of PFSSs were strongly influenced by decreased risk of medication errors and contamination of intravenous medication. Extrapolating these results nationwide indicated potential savings of >€300 million (US$342 million) if only PFSSs were used.

IMPLICATIONS

The use of PFSSs prepared in the hospital pharmacy yielded cost savings compared with the CPM on the ward in the Dutch hospital.

A Proof of Principle Study of the Terminal Sterilization of Prefilled Syringes Using A Water Cascade Process

Background

A new development in drug compounding is the production of ready-to-administer sterilized prefilled syringes. A challenge with these syringes is the method of terminal sterilization. There is no information available whether water cascade sterilization is a suitable method. We investigated the effect of this sterilization method on cyclic olefin (co)polymer (CCP/COC) syringes.

Methods

For two brands ten prefilled syringes were sterilized using water cascade sterilization. The closure integrity, stopper movement, weight, diameter and physical appearance were determined before and after sterilization. As sterility test, additional syringes were filled with tryptic soy broth (TSB) and sterilized. After fourteen days microbiological growth was determined.

Results

Closure integrity testing showed no dye penetration inside the syringe. Together with the results for weight this showed that closure integrity is guaranteed. No significant stopper movement, deviation in diameter or visual anomalies were observed. No microbiological growth in TSB was visible.

Conclusions

The results of this proof of principle study show that the physical and microbiological stability of the cyclic olefin (co)polymer syringes is guaranteed during sterilization using a water cascade sterilizer. These results do not rule out the necessity for further stability experiments (e. g. interaction with drug product) to further proof the concept.

Resolution CM/Res(2016)2 and Centralised Intra Venous Additive Services (CIVAS): Challenges and Opportunities

The aim of the European Council’s Resolution CM/res(2016)2 on good reconstitution practices in health care establishments for medicinal products for parenteral use is to guide the health care establishment’s decision as to where reconstitution should take place: in the pharmacy or the clinical area. Injectable preparation in hospital pharmacy is performed in Centralised Intra Venous Additive Services (CIVAS). Nevertheless, challenges such as ensuring the sterility of the preparation, the physicochemical stability of the product, and process validation for instance should be taken into account. This opinion paper examines the challenges, impacts, and responsibilities for pharmacists, nurses, and hospital management related to implementing the resolution, regarding the experience of countries where CIVAS are already implemented. It also discusses the opportunities of implementing CIVAS with regard to patient care safety and potential financial savings.