Mirabegron for the treatment of overactive bladder: cost-effectiveness from US commercial health-plan and Medicare Advantage perspectives

Anticholinergic Burden in Patients Treated for Overactive Bladder: Second-Line Therapy with Tibial Nerve Stimulation as a Solution

Overactive bladder (OAB) is a highly prevalent condition with significant associated comorbidities. Current management guidelines suggest the utilization of anticholinergic medication as a second line after nonpharmacological treatment. Tibial nerve stimulation (TNS), which has previously been thought to have been expensive and inaccessible, was relegated to a third-line therapy. However, given the recently discovered association between anticholinergic medication use and dementia as well as the recent FDA approval of transcutaneous tibial nerve stimulation (TTNS), there may be a need to revisit management guidelines. In this commentary, we identify the two types of TNS, percutaneous tibial nerve stimulation (PTNS) and TTNS and compare them with anticholinergics. By considering their respective efficacies, side-effects profiles, and associated costs, we make the case in this commentary for an update to guidelines that includes TNS as second-line OAB management ahead of anticholinergic medication.

Urinary Incontinence Medications: Patient-Initiated Concerns in Primary Care

IMPORTANCE

Guideline-recommended medications for overactive bladder and urge urinary incontinence (OAB/UUI) are effective but have high costs and side effects. Little is known about patient concerns regarding these medications when prescribed by their primary care providers (PCPs).

OBJECTIVE

The aim of the study was to describe PCP-patient interactions when prescribing medications for OAB/UUI, specifically clinical concerns, cost and authorization issues, and mode of communication for these interactions.

STUDY DESIGN

Using electronic health records, we identified a retrospective cohort of women aged 18-89 years who were prescribed a medication for OAB/UUI during a primary care office visit from 2017 to 2018. We examined the electronic health record from initial prescription through 15 subsequent months for documentation of prior authorization requests and patient concerns about cost, side effects, or ineffectiveness. The association of patient demographics, comorbidity, and medication class with these concerns was examined with logistic regression models.

RESULTS

Overall, 46.2% of patients (n = 123) had 1 or more OAB/UUI medication concerns, and 52 reported outside an office visit. Only higher comorbidity was associated with reduced concern of any type. Although the overall percent age of patients reporting concerns was similar by medication type, the patterns of concern type varied. Compared with those taking short-acting antimuscarinics, patients taking long-acting antimuscarinics other than oxybutynin were less likely to have side effect concerns (adjusted odds ratio 0.35, 95% CI 0.16-0.78) and more likely to have cost concerns (adjusted odds ratio 5.10, 95% CI 1.53-17.03).

CONCLUSIONS

Patient concerns regarding OAB/UUI medications were common in primary care practices and frequently reported outside of office visits. However, the patterns of concerns (cost vs side effects) varied between medication classes.

Analyzing Access and Costs of Oral Medications for Overactive Bladder: Uncovering Disparities

OBJECTIVE

To report out-of-pocket costs associated with overactive bladder (OAB) medications among Medicare beneficiaries and the uninsured.

METHODS

We performed a cross-sectional analysis of the Centers for Medicare & Medicaid Services Prescription Drug Plan Formulary Data (Q1-2022). FDA-approved medications for OAB were identified. We calculated out-of-pocket costs for Medicare beneficiaries in each Part D prescription benefit phase, average retail price, total yearly costs and discounted prices through cash-pay discount coupons (GoodRx) or online pharmacies like Mark Cuban Cost Plus Drug Company (MCCPDC). We also report plan utilization management requirements.

RESULTS

We analyzed 5721 plan formularies for 18 medications. Mirabegron was the only beta-3 agonist (B3). Only Vesicare oral solution (14.3% of plans) and Mirabegron (0.1%) required prior authorization. Many plans required step therapy for selective generic anticholinergics (ACH) (12.4%-43.3%), while the B3 rarely required step therapy (0.6%). Monthly costs varied by coverage phase and averaged $59 for ACHs in the initial coverage phase ($14 in catastrophic; $72 in coverage gap). The monthly cost for the B3 averaged $47 in the initial coverage phase ($26 in catastrophic; $129 in coverage gap). The total yearly cost for generic ACHs ranged from $494 (oxybutynin IR) to $1452 (darifenacin) and the yearly cost for brand-name ACHs ranged from $1175 (Toviaz ER) to $2198 (Oxytrol). The total yearly cost for the B3 was $1283.

CONCLUSION

We evaluated coverage, out-of-pocket costs, total yearly costs, and utilization management for OAB medications to make pricing more transparent. While selective medications may be "covered," coverage does not translate into affordable drug prices.

Treatment for Urinary Incontinence in Women Older Than 65 Years

IMPORTANCE

Urinary incontinence (UI) is common among women older than 65 years and negatively affects quality of life. However, the prevalence of UI treatment and determinants of treatment are largely unknown.

OBJECTIVES

The aim of this study was to identify rates of UI treatment and factors associated with treatment in older women with self-reported UI.

STUDY DESIGN

This is a retrospective cohort analysis of a data set linking UI symptoms from the Nurses' Health Study to Medicare claims. We evaluated use of pharmacotherapy, noninvasive, and procedural treatments for UI within 1 year before symptom survey. For pharmacotherapy, we used multivariable logistic regression to estimate odds ratios (ORs) of UI treatment.

RESULTS

Of the 67,587 Nurses' Health Study respondents, 15,088 had linkage to Medicare, subscribed to part D, and answered UI questions. Of these, 8,332 (55.2%) women reported UI, and 10.9% with UI had a Medicare claim for treatment; pharmacotherapy represented 94.6% of all treatments.On regression analysis, women with more severe and longer-term UI had higher odds of treatment (severe vs slight UI: OR, 3.1; 95% confidence interval [CI], 2.2-4.3) (longer vs new UI: OR, 1.9; 95% CI, 1.5-2.3). Women with mixed (OR, 2.5; 95% CI, 1.9-3.2) or urgency UI (OR, 3.0; 95% CI, 2.2-3.9) had greater odds of treatment compared with women with stress UI.

CONCLUSIONS

We estimate that only approximately 1 in 9 older women with self-reported UI underwent treatment within the year before reporting symptoms, of which pharmacotherapy was the most common UI intervention, and women with more severe and longer duration of symptoms were most often treated.

Healthcare and economic burden of anticholinergic use in adults with overactive bladder: a systematic literature review

Aim: To determine the economic burden associated with anticholinergic medication use in adults with overactive bladder (OAB) in the USA. Methods: A systematic literature review was conducted to identify articles assessing healthcare resource utilization (HCRU) and costs associated with anticholinergic use in adults with OAB. Results: From the 34 articles identified, increased anticholinergic burden, switching anticholinergic treatments and potentially inappropriate anticholinergic use were associated with increased HCRU and/or costs. However, studies comparing patients with OAB receiving anticholinergics to individuals with untreated OAB or without OAB reported a mix of increases and decreases in HCRU and costs. Conclusion: Additional controlled studies assessing the economic impact of anticholinergics in OAB are needed and may enable optimization of economic and potentially patient outcomes.

Budget Impact Analysis of Vibegron for the Treatment of Overactive Bladder in the USA

BACKGROUND

Overactive bladder (OAB) is associated with considerable clinical and economic burden. Treatment of patients with OAB using anticholinergics is limited by tolerability issues and increased anticholinergic burden, which is associated with increased risk of dementia and falls/fractures. This analysis assessed the budget impact of introducing the β₃-adrenergic agonist vibegron for the treatment of patients with OAB from US commercial payor and Medicare perspectives.

METHODS

A budget impact model (BIM) with a 5-year time horizon was developed using a top-down, prevalence-based approach and projected market shares for 1-million-member US commercial and Medicare plans. The BIM included vibegron, mirabegron, and anticholinergics, incorporating changes in clinical outcomes (efficacy, drug-drug interactions, anticholinergic burden (ACB), OAB-related comorbidities, and adverse events (AEs)). Costs per member per month (PMPM) and per treated member per month (PTMPM) were determined. One-way sensitivity analyses quantified the impact of changes in key variables.

RESULTS

The introduction of vibegron was associated with a modest increase in PMPM cost over 5 years of $0.12 (range for years 1‒5, $0.01‒$0.26) for commercial payors and $0.24 ($0.01‒$0.52) for Medicare (PTMPM cost: $2.70 ($0.17‒$4.85) and $3.15 ($0.19‒$5.82), respectively). Costs were partially offset by savings related to decreased third-line treatment use, yearly decreases in AE and comorbidity incidence, reduced drug-drug interactions, and reduced ACB associated with vibegron introduction. PMPM costs were most sensitive to vibegron market share assumptions, OAB prevalence, and vibegron persistence at 1 month for private payors and Medicare and additionally vibegron persistence at 12 months for Medicare.

CONCLUSIONS

Vibegron may address unmet needs in treating OAB and is a useful addition to health plans while minimizing risks of anticholinergic AEs, ACB, and drug-drug interactions, which may partially offset increased pharmacy costs.

Cost-effectiveness evaluation of mirabegron versus anti-muscarinics and third-line therapies: a systematic review

BACKGROUND

Overactive bladder (OAB) is defined as urinary urgency, usually with urinary frequency and nocturia, with or without urgency urinary incontinence. OAB can interfere with health-related quality of life. The current treatment for OAB includes conservative management, surgery, and pharmacotherapy. Mirabegron is a new drug acting by the mechanism of ß3-adrenoceptor agonism. This study aimed to review the cost-effectiveness of mirabegron in the treatment of OAB.

AREAS COVERED

We searched published articles in electronic search databases. Ten studies were included in the qualitative analysis. Various antimuscarinics, including oxybutynin, fesoterodine, tolterodine, darifenacin, and trospium were compared with mirabegron. The results were evaluated and compared according to the quality-adjusted life-years (QALY), cost/year, and incremental cost-effectiveness ratio (ICER). Of the ten studies in only three, mirabegron was not a cost-effective strategy. In seven cases, mirabegron was cost-effective.

EXPERT OPINION

: Based on our findings, the cost-effectiveness of mirabegron was variable in different regions; however, most of the studies show the cost-effectiveness of mirabegron. Our study illustrates that mirabegron's incremental cost-effectiveness ratio in comparison with its comparators is below the willingness to pay threshold even in the countries with low GDP/Capita. The results also showed that despite the low price and no difference in the effectiveness of mirabegron compared to antimuscarinic drugs, the sensitivity of the study results to adverse effects and supportive therapeutic interventions for patients treated with antimuscarinic drugs. Our proposal for future economic studies for OAB pharmacotherapy is to compare different doses, formulations, and administration forms in a real-world context.

Overactive bladder medication prescription trends from 2014 to 2018

PURPOSE

A growing literature points to an association between overactive bladder (OAB) medications and dementia. Given differences in side effects for extended-release (ER) and immediate-release (IR) anticholinergic formulations and beta-3 agonists, we examined prescription utilization patterns in a national dataset of older adults from 2014 to 2018.

METHODS

We performed a retrospective study using the Medicare Part D Drug Spending Dashboard, a publicly available database that includes data from outpatient pharmacy claims from 2014 to 2018 in the United States. We identified total claims and total spending on common OAB medications, and further assessed trends by anticholinergic burden by medication, and immediate and ER formulations.

RESULTS

There were 54.1 million claims for OAB medications, accounting for $10.1 billion (2018 United States dollars) in spending from 2014 to 2018. When considering beta-agonist, mirabegron accounted for 13.1% of total claims and 29.0% of total spending. Mirabegron accounted for a greater proportion of OAB medication claims and spending during the 5 years from 5.7% to 20.1% and 11.3% to 44%, respectively. IR anticholinergics accounted for fewer total claims over this period, from 58.5% to 42.6%. ER formulations increased in proportion of all OAB medication total claims from 35.8% to 37.5% from 2014 to 2016, and decreased to 37.3% by 2018.

CONCLUSION

OAB medications and expenditures increased from 2014 to 2018. Mirabegron accounted for higher proportions and IR-formulations for decreased proportions of each from 2014 to 2018. The impact on clinical outcomes is a key area for future investigation considering our findings.

Cost-effectiveness of vibegron for the treatment of overactive bladder in the United States

AIMS

To evaluate the cost-effectiveness of vibegron compared with other oral pharmacologic therapies as treatment for overactive bladder (OAB).

METHODS

A semi-Markov model with monthly cycles was developed to support a lifetime horizon of vibegron 75 mg from a US commercial payor or Medicare perspective. The model incorporated efficacy (reductions in daily micturitions and urinary incontinence episodes), adverse events, OAB-related comorbidities, drug-drug interactions, anticholinergic burden, and treatment persistence. Direct costs and quality-adjusted life years (QALY) were accumulated over time. The primary outcome was the cost per QALY incremental cost-effectiveness ratio (ICER). One-way (OWSA) and probabilistic sensitivity analyses (PSA) were performed.

RESULTS

For commercial payors, vibegron was cost-effective at a willingness-to-pay (WTP) threshold of $50,000/QALY versus mirabegron 50 mg (ICER, $9,311) and at a WTP threshold of $150,000/QALY versus mirabegron 25 mg (ICER, $141,957) and versus an anticholinergic basket based on market share (ICER, $118,121). For Medicare, vibegron was cost-effective at a WTP threshold of $50,000/QALY versus mirabegron 50 mg (ICER, $12,154) and at a WTP threshold of $100,000/QALY versus mirabegron 25 mg (ICER, $99,150) and versus an anticholinergic market basket (ICER, $60,756). For commercial payors and Medicare, OWSAs for vibegron versus mirabegron indicated cost-effectiveness was most sensitive to vibegron persistence at 1 and 12 months. PSAs indicated that vibegron was cost-effective versus mirabegron 50 mg 98.6% and 100% of the time at $50,000/QALY for commercial payors and Medicare payors, respectively.

LIMITATIONS

Due to lack of real-world data available on persistence, vibegron was assumed to have the same persistence as mirabegron 50 mg. Long-term efficacy was assumed to be sustained beyond 52 weeks in the absence of clinical trials longer than 52 weeks.

CONCLUSIONS

Vibegron is cost-effective from a commercial payor (WTP threshold $150,000/QALY) and Medicare (WTP threshold $100,000/QALY) perspective when compared with other oral pharmacologic treatments for OAB.

Rethinking Second-Line Therapy for Overactive Bladder to Improve Patient Access to Treatment Options

Idiopathic overactive bladder (OAB) is a chronic condition that negatively affects quality of life, and oral medications are an important component of the OAB treatment algorithm. Recent literature has shown that anticholinergics, the most commonly prescribed oral medication for the treatment of OAB, are associated with cognitive side effects including dementia. β3-adrenoceptor agonists, the only alternative oral treatment for OAB, are similar in efficacy to anticholinergics with a more favorable side effect profile without the same cognitive effects. However, there are marked cost variations and barriers to access for OAB medications, resulting in expensive copays and medication trial requirements that ultimately limit access to β3-adrenoceptor agonists and more advanced procedural therapies. This contributes to and perpetuates health care inequality by burdening the patients with the least resources with a greater risk of dementia. When prescribing these medications, health care professionals are caught in a delicate balancing act between cost and patient safety. Through multilevel collaboration, we can help disrupt health care inequalities and provide better care for patients with OAB.

Are Beta 3 Adrenergic Agonists Now the Preferred Pharmacologic Management of Overactive Bladder?

PURPOSE OF THE REVIEW

This paper discusses the recent evidence supporting beta 3 adrenergic agonists as the preferred pharmacological management of overactive bladder syndrome.

RECENT FINDINGS

Mirabegron has a similar efficacy profile to first-line antimuscarinics with favorable adverse effects profile. Treatment of OAB with beta-3 adrenergic agonist should be favored in patients at higher risk of anticholinergic adverse events. The efficacy and tolerability of beta-3 adrenergic agonists are consistently reported in older OAB patients, whether used alone or with other antimuscarinics. Mirabegron is cost-effective in treating OAB unless the symptoms were severe or refractory. Combination therapy of mirabegron and other pharmacotherapy has proven to be efficient in controlling OAB symptoms without inducing serious add-on adverse effects. While beta-3 adrenergic agonists bear favorable advantages in OAB treatment, physicians should perform a thorough and careful pre-treatment planning to optimize treatment benefits and adherence.

Cost Effectiveness of Mirabegron Compared with Antimuscarinic Agents for the Treatment of Adults with Overactive Bladder in Colombia

OBJECTIVES

The aim of this study was to evaluate the cost effectiveness of mirabegron relative to two antimuscarinics, oxybutynin extended release (ER) and tolterodine ER, in patients with overactive bladder (OAB) from the perspective of a third-party payer in Colombia.

METHODS

A Markov model simulated the therapeutic management, disease course, and complications in hypothetical cohorts of OAB patients over a 5-year period. The model predicted costs and three outcomes: quality-adjusted life-years (QALYs), micturition state improvement (MSI), and incontinence state improvement (ISI). In each 1-month cycle, patients could transition between different health states reflecting symptom severity. Transition probabilities were estimated from a published mirabegron trial and mixed treatment comparison. Other inputs such as treatment discontinuation based on treatment-specific rates of persistence, resource use and costs, anticholinergic burden, comorbidity treatment, and drug acquisition were obtained from Società Italiana Scienze Mediche, Instituto de Seguros Sociales Tariff Manual, published literature, and expert opinion. Deterministic and probabilistic sensitivity analyses were conducted. Costs are presented in 2017 Colombia Pesos (COP).

RESULTS

Mirabegron was cost effective for all outcome measures at a willingness-to-pay threshold of 124,919,725 COP, which is three times the per capita gross domestic product (GDP). Using QALYs as the measure of effect, mirabegron had an incremental cost-effectiveness ratio (ICER) of 85,802,036 COP/QALY (26,365 USD/QALY) and 66,360,134 COP/QALY (20,384 USD/QALY) versus oxybutynin and tolterodine, respectively. Probabilistic sensitivity analyses showed that mirabegron was cost effective in 99.5% and 100% of simulations compared with oxybutynin and tolterodine, respectively. Using MSI and ISI as the measure of effects yielded ICERs below one GDP.

CONCLUSIONS

Mirabegron is a cost effective alternative to oxybutynin and tolterodine from the perspective of a third-party payer in Colombia.

New technologies in the management of overactive bladder: current research and future prospects

Overactive bladder is characterized by frequency, urgency (wet or dry) and nocturia. These troublesome symptoms incur both a physiologic and economic cost, expected to be in excess of US$82 billion in the USA and Europe by the year 2020. Second-tier medicinal oral therapies for overactive bladder abound, but the failure rate or discontinuation at 1 year exceeds 50%. Tertiary-tier therapies involve surgical alternatives including neuromodulation of sacral nerve 3 (S3) or the posterior tibial nerve as a means to manipulate and ameliorate the above-described voiding symptoms. Sacral neuromodulation has been studied for more than 20 years, but newer, smaller, rechargeable implantable devices are in the forefront of current investigation. Hopes are that modifications to the device will eventually be possible at the patient's home, rather than the physician's office, with close urological/gynecologic supervision and guidance. Another means of surgical intervention for overactive bladder includes the use of a cystoscopy-guided radiofrequency probe by which energy disrupts the bladder floor neural voiding plexi. Stem cell therapy is also being evaluated for overactive bladder but is in the early stages of development.

Cost–effectiveness of overactive bladder treatments: from the US payer perspective

Aim: To assess the cost–effectiveness of onabotulinumtoxinA (onabotA), implantable sacral nerve stimulation devices, percutaneous tibial nerve stimulation, anticholinergic medications and mirabegron compared with best supportive care (BSC) for management of refractory overactive bladder (OAB). Methods: A Markov model was developed to compare the cost–effectiveness of treatment options with BSC over a 10-year time horizon. Resource utilization, discontinuation rates and costs were derived from unpublished and published sources. Quality-adjusted life-years (QALYs) and incremental cost–effectiveness ratios were reported. Results: Treatment with onabotA 100U produced the largest gain in QALYs (7.179) and lowest estimated incremental cost–effectiveness ratio ($32,680/QALY) of all assessed treatments compared with BSC. Conclusion: Compared with BSC, onabotA 100U was the most cost-effective treatment option for patients with refractory OAB.

Real-world persistence and adherence to oral antimuscarinics and mirabegron in patients with overactive bladder (OAB): a systematic literature review

PURPOSE

To evaluate persistence and adherence of oral pharmacotherapy used in the treatment of overactive bladder (OAB) in a real-world setting.

MATERIALS AND METHODS

Systematic literature searches of six electronic publication databases were performed to identify observational studies of patients with OAB treated with antimuscarinics and/or mirabegron. Studies obtaining persistence and adherence data from sources other than electronic prescription claims were excluded. Reference lists of identified studies and relevant systematic reviews were assessed to identify additional relevant studies.

RESULTS

The search identified 3897 studies, of which 30 were included. Overall, persistence ranged from 5% to 47%. In studies reporting data for antimuscarinics and mirabegron (n=3), 1-year persistence was 12%-25% and 32%-38%, respectively. Median time to discontinuation was <5 months for antimuscarinics (except one study (6.5 months)) and 5.6-7.4 months for mirabegron. The proportion of patients adherent at 1 year varied between 15% and 44%. In studies reporting adherence for antimuscarinics and mirabegron, adherence was higher with mirabegron (mean medication possession ratio (MPR): 0.59 vs 0.41-0.53; mean proportion of days covered: 0.66 vs 0.55; and median MPR: 0.65 vs 0.19-0.49). Reported determinants of persistence and adherence included female (sex), older age group, use of extended-release formulation and treatment experience.

CONCLUSION

Most patients with OAB discontinued oral OAB pharmacotherapy and were non-adherent 1 year after treatment initiation. In general, mirabegron was associated with greater persistence and adherence compared with antimuscarinics. Combined with existing clinical trial evidence, this real-world review merits consideration of mirabegron for first-line pharmacological treatment among patients with OAB.

PROSPERO REGISTRATION NUMBER

CRD42017059894.

Review of Economic Value Drivers of the Treatment of Overactive Bladder

Overactive bladder (OAB) is a symptom-driven condition with economic burden estimated to be on the order of several hundred dollars or euros per patient in some North American and European countries. This work reviews recently published economic models to evaluate how health states are defined, what cost components are considered, and what utility values are used to estimate the cost effectiveness of OAB pharmacotherapies, botulinum toxin, or sacral neuromodulation. It was found that no clear standard exists for determining OAB health states, although most were defined by some measure of incontinence frequency. Costs of physician visits and incontinence pads were included in nearly all models; however, OAB-associated depression and nursing home costs were rarely included, despite being large cost drivers of global economic burden studies. Utility values used in the models ranged from 0.544 to 0.933, highlighting the uncertainty associated with how OAB patients value health-related quality of life. More research is warranted so that health states providing delineations among OAB symptom severity and quality of life are clinically and economically meaningful as well as meaningful to affected patients.

The impact of persistence with mirabegron usage vs switching to onabotulinumtoxinA on healthcare costs and resource utilization in patients with overactive bladder in the United States

AIMS

To compare healthcare costs and resource utilization in patients with overactive bladder (OAB) in the US who switch from mirabegron to onabotulinumtoxinA (onabotA) with those who persist on mirabegron.

MATERIALS AND METHODS

A retrospective observational claims analysis of the OptumHealth Administrative Claims database conducted between April 1, 2012 and September 30, 2015 used medical and pharmacy claims to identify patients with at least one OAB diagnosis who switched from mirabegron to onabotA (onabotA group) or persisted on mirabegron for at least 180 days (mirabegron persisters). Propensity score weighting was used to balance baseline characteristics that were associated with increased healthcare expenditures across treatment groups. Multivariate analyses assessed the impact of switching and persistence on all-cause and OAB-related healthcare costs and resource utilization in the year following each patient's index date.

RESULTS

In total, 449 patients were included in this study: 54 patients were included in the onabotA group, and 395 patients were included in the mirabegron persister group. Compared with the mirabegron persister patients, the onabotA patients observed significantly higher OAB-related total costs ($5,504 vs $1,772, p < .001), OAB-related medical costs ($5,033 vs $351, p < .001), sacral neuromodulation costs ($865 vs $60, p = .017), and outpatient costs ($17,385 vs $9,035, p = .009), and more OAB-related medical visits (6.0 vs 1.9, p < .001). OnabotA patients had lower OAB-related prescription costs ($470 vs $1,421, p < .001) and fewer OAB-related pharmacy claims (1.6 vs 5.0, p <.001). There were no significant differences in all-cause total medical or prescription costs.

LIMITATIONS

This study was a retrospective analysis using claims data that only included patients with commercial health coverage or Medicare supplemental coverage. Accuracy of the diagnosis codes and the generalizability of the results to other OAB populations are limited. The study was not designed to determine the impact of OAB treatments on the economic outcomes examined.

CONCLUSIONS

OAB patients who persisted on mirabegron treatment for at least 180 days had lower OAB-related healthcare costs and resource utilization compared with those who switched to onabotA.

Clinical and economic impact of mirabegron compared with antimuscarinics for the treatment of overactive bladder in Canada

BACKGROUND

The β₃-adrenoceptor agonist, mirabegron, and antimuscarinic agents provide similar efficacy for the treatment of overactive bladder (OAB), but mirabegron appears to be associated with better persistence, perhaps due to an absence of anticholinergic side-effects. This study estimated the expected costs associated with the management of OAB in Canada from a societal perspective by utilizing real-world evidence.

METHODS

An economic model with monthly cycles and a 1-year time horizon was developed to depict a treatment pathway for a hypothetical cohort of 100 patients with OAB. At model entry, patients receive mirabegron or an antimuscarinic. Patients who do not persist may switch treatment, undergo a minimally invasive procedure, or remain symptomatic (uncontrolled). The model includes direct costs (e.g. physician visits) and indirect costs (e.g. lost productivity). A one-way univariate sensitivity analysis assessed a ±20% variation in each of the key model inputs.

RESULTS

At 1 year, a greater proportion of patients persisted on treatment with mirabegron compared with antimuscarinics (33% vs 15-23%), and a smaller proportion switched treatment (17% vs 20-22%). The number of healthcare visits (292 vs 299-304), pads used (74,098 vs 77,878-81,669), and work hours lost (4,497 vs 5,372-6,249) were all lower for mirabegron vs antimuscarinics. The estimated total annual cost of treatment per patient with mirabegron was $2,127.46 Canadian dollars (CAD) ($5.82 CAD/day) compared with $2,150.20-$2,496.69 CAD ($5.89-$6.84 CAD/day) for antimuscarinics. The one-way sensitivity analysis indicated the results are robust.

CONCLUSIONS

Improved persistence observed in routine clinical practice with mirabegron appears to translate into benefits of reduced healthcare resource use, and lower direct and indirect costs of treatment compared with antimuscarinics. Overall, these data suggest that mirabegron may offer clinical and economic benefits for the management of patients with OAB in Canada.