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Beyond-use Date of Trimix: A Reproducible Stability Study Using Bracketing Design

Author(s):  Patel Gopesh, Davis Countaney, Liu Yi, Ip Kendice, Debideen Krystal E, Anderson Stephanie, Byrne Robert, Herr Dylan, Rhoads Melissa Merrell, Caputo Ross, Banov Daniel, Bassani August S

Issue:  Jan/Feb 2021 - Volume 25, Number 1
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Abstract:  Trimix is a widely prescribed penile injection for patients with erectile dysfunction and is only available as a compounded medication. The instability of alprostadil, one of the major ingredients of Trimix, has been a limiting factor in its utilization. There are published stability data for Trimix formulations that have been used to establish a beyond-use-date. However, a robust bracketed study that is shown to be reproducible is highly desirable and meaningful. The purpose of this study was to test the reproducibility of a bracketed stability study when the preparations were made by two different entities to provide beyond-use date information of Trimix preparations that cover a wide range of strengths. A validated stability indicating method was used to compare the stability of a bracketed Trimix - alprostadil 5 µg/mL to 45 µg/mL, papaverine 15 mg/mL to 30 mg/mL, and phentolamine 0.4 mg/mL to 5 mg/mL, and a single-strength preparation containing alprostadil 30 µg/mL, papaverine 30 mg/mL, and phentolamine 2 mg/mL that were compounded and stored following the same methods and conditions, but at two different practice settings. Beyond-use dates of 60 days and 64 days at cold temperature were obtained for the two preparations from two different settings. The consistent results confirmed the reproducibility of the bracketing designs used to determine the beyond-use dates of Trimix. The clinical value of these results stems from the availability of accurate and widely applicable stability data that can be referenced to establish beyond use dates of a number of Trimix preparations with various strength combinations.

Related Keywords: Gopesh Patel, RPh, Courtaney Davis, CPhT, Yi Liu, PharmD, PhD, RPh, Kendice Ip, MS, Krystal E. Debideen, CPhT, Stephanie Anderson, MBA, Robert Byrne, PhD, Dylan Herr, Melissa Merrell Rhoads, PharmD, RPh, Ross Caputo, PhD, Daniel Banov, MS, RPh, August S. Bassani, PharmD, RPh, Trimix, penile injection, intracavernosal injection, corpora cavernosum, erectile dysfunction, penile erection, alprostadil, prostaglandin E1, papaverine hydrochloride, smooth muscle relaxant, cyclic adenosine monophosphate agonist, phentolamine mesylate, vasoconstriction blocker, vasodilator, drug admixture stability, physical stability, chemical stability, beyond-use date, formulations, aseptic preparations, compounded sterile preparations


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