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Stability of Two Antifungal Agents, Fluconazole and Miconazole, Compounded in HUMCO RECURA Topical Cream to Determine Beyond-Use Date

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Stability of Two Antifungal Agents, Fluconazole and Miconazole, Compounded in HUMCO RECURA Topical Cream to Determine Beyond-Use Date PEER REVIEWED Stability of Two Antifungal Agents, Fluconazole and Miconazole, Compounded in HUMCO RECURA Topical Cream to Determine Beyond-use Date ABSTRACT Pradeep Gautam, MS Chemistry A novel compounding vehicle (RECURA) has previously been proven to Bob Light, BS, RPh penetrate the nail bed when compounded with the antifungal agent miconazole or fluconazole, providing for an effective treatment for onychomycosis. In this Troy Purvis, PhD study, miconazole and fluconazole were compounded separately in RECURA compounding cream, and they were tested at different time points (0, 7, 14, 28, 45, 60, 90, and 180 days), determining the beyond-use date of those INTRODUCTION formulations. The beyond-use date testing of both formulations (10% Onychomycosis is a fungal infection of miconazole in RECURA and 10% fluconazole in RECURA) proved them to be the nail bed in the fingers, or more com- physically, chemically, and microbiologically stable under International monly the toes, which affects an estimated Conference of Harmonisation controlled room temperature (25°C ± 2°C/60% 1 10% of the world’s population. Trichophy- RH ±5%) for at least 180 days from the date of compounding. Stability- ton is the typical fungal genus that causes indicating analytical method validation was completed for the simultaneous these infections in Western countries, while determination of miconazole and fluconazole in RECURA base using high- those living tropical regions experience Candida, Aspergillus, or Scytaldium infec- performance liquid chromatography coupled with photodiode array detector tion,2 but the symptoms of these infections prior to the study. are similar across the board. Minor infec- tion causes a yellow or black thickening of the nail bed, while further progression can 48% cure rate),1 yet concern about long- These medications must be in direct contact result in the nail chipping away and leaving term dosing and severe side-effects due to with the fungus in order to kill it.5 The FDA- an open sore, leading to secondary infec- oral administration exists. Topical treat- approved newer azole antifungals have been tion. Without treatment, these infections ment, and the accompanying reduction in shown to be only slightly more effective, can cause problems beyond the cosmetic, serious side-effects, is preferred, but topical specifically for onychomycosis, than other with infection spreading onto the whole treatment requires patient compliance to treatments. Topical efinaconazole (Jublia), digit, which might lead to difficulty walking apply the medication daily for up to a year while having a cure rate of 15% to 17% and or doing manual tasks.1 for complete treatment. being two to three times more effective than Treatment of onychomycosis is notori- Topical treatments for onychomycosis ciclopirox, still does not cure over half of the ously difficult. While safe and effective vary in cost and efficacy. Nail paints and fungal infections of this type.6 anti-fungal medications have been devel- lacquers (e.g., ciclopirox) have been used, In order to deliver the azole medication to oped, the challenge is to deliver these medi- mostly with low degrees of efficacy. Topical the site of action, the carrier vehicle is very cations effectively to the site of action— creams containing azole type antifungals important, penetrating through keratinized underneath a nail. Oral treatment with an have proven to show better efficacy, but skin and thick nail plates that form the nail anti-fungal can deliver the medication to those treatments don’t have success in all bed in order to be delivered effectively. A the site of action. However, to achieve high cases.4 Azole antifungal drugs are power- compounded prescription, formulated in enough concentration under the nail bed to ful in destroying fungus, as they inhibit the such a vehicle, would be appropriate for kill the fungus, a patient must ingest large enzyme lanosterol 14 α-demethylase; the the treatment of onychomycosis, tailored amounts of these drugs, which can have side enzyme necessary to convert lanosterol to with the specific anti-fungal that treats effects including liver and kidney toxicity.3 ergosterol. Depletion of ergosterol of the the individual dermatophyte. RECURA is Terbinafine oral treatment has been shown fungal membrane disrupts the structure a compounding base designed to allow for to be effective (76% cure rate versus itra- and many functions in fungal membrane penetration of anti-fungal medications to conazole’s 60% cure rate and fluconazole’s leading to inhibition of fungal growth. subungual tissues.7 International Journal of Pharmaceutical Compounding www.IJPC.com 154 Vol. 21 No. 2 | March | April | 2017 Peer Reviewed Prescribed compounding drugs are expected to be efficacious Weight Scale, Cum- FIGURE 2. CHEMICAL STRUCTURE OF and safe at the same time, and compounding pharmacies have ming, Georgia) were FLUCONAZOLE. the responsibility to assure their patients that their compounded Cl also used for sample preparations are stable over a given time frame.8 Beyond-use date testing during the (BUD) is the estimation of time interval or the date after which a stability study. N OH N compounded prescribed preparation shouldN not be used, and it is N N determined from the date the compounder or pharmacist com- PREPARATION OF 8,9N O Cl N N pounded the prescription drug. Pharmacists are responsible for MICONAZOLE AND assigning a BUD based on the guidelines described in United States F FLUCONAZOLE Pharmacopeia (USP) Chapter <795> Pharmaceutical CompoundCl - CREAMS ing—Non-Sterile Preparations. The maximum BUD of any com- pounding preparation is up to six months, however, a shorter BUD is A bulk amount (ap- generally recommended, especially for those drugs that are known proximately 250 g) of to be labile to decomposition.9 Stability studies have been published each formulation (mi- F to show the stability of certain actives in various compoundingCl conazole 10% in RE- vehicles over time,10,11 so the aim of the work presented here is to CURA and fluconazole show the BUD stability for the two antifungal agents miconazole 10% in RECURA) was and fluconazole in RECURA topical compounding vehicle. prepared and divided into individual samples contained in polypro- pylene ointment jars (50 mL) with foiled lined caps. Samples from each bulk batch were also stored in unguator jars (30 mL) to assess MATERIALS AND METHODS the air permeability of the container. MATERIALS AND CHEMICALS Fluconazole 2.863 Miconazole, USP grade (Lot0.035 2EG0292) (Figure 1), and high- SAMPLE TESTING AND TESTING INTERVALS performance liquid chromatography (HPLC)-grade water (Lot 0.030 All BUD samples were placed in a stability chamber equilibrated 4506B48) were purchased from Spectrum Chemicals (New to International Conference of Harmonisation (ICH) controlled Brunswick, New Jersey) 0.025 room temperature 25°C ± 2°C/60% RH ±5%. Samples for BUD and Fluconazole, USP grade AU 0.020FIGURE 1. CHEMICAL STRUCTURE analysis were fully tested for all the listed requirements (Table 1) (Lot X4YGD) (Figure 2), OF MICONAZOLE. at the following time points: 0, 7, 14, 21, 28, 28, 45, 60, 90, and 180 was purchased from Tokyo 0.015 days. At each time point, samples were removed from the stability Chemical Industry Co. Cl 0.010 chamber and weighed to determine the weight loss (evaporation) Ltd. (Portland, Oregon). 0.005 due to container permeability. Samples in the jarsOH were evaluated Potassium phosphate In Placebo - 1.449 N N Camphorfor (In organoleptic Placebo) 2 - 7.399properties and visually for separation prior to monobasic monohydrate 0.000 N mixing the sample with a glass rod. Additionally,N the potencyN of both salt (Lot 201017511) and 1N O Cl formulations was also carriedN out for the sample in the unguator N NaOH (Lot HC56320819) N0 2 4 6 8 10 12 14 jar to determine if the container permeation had an effect onF the were purchased from EMD Time (Minutes) preparation over time (at day 14 and day 28). Chemicals (Gibbstown, Cl For microbiological stability, jars of both formulations were New Jersey). Acetonitrile analyzed at day 0 and day 180 for different microbiological tests (Lot 158054), HPLC grade, including: Total Aerobic Microbial Count (TAMC) (as per USP was acquired from Fisher <61>), Total Combined Yeast and Mold (TCYM) (as per USP <61>), Scientific (Fairlawn, New 0.050 Staphylococcus aureus (S. aureus),120% and PseudomonasF aeruginosa (P. Jersey). RECURA anti- Cl Miconazole 0.045 aeruginosa) (both as per USP <62>).115% fungal compounding cream 10.705 0.040 110% (Lot A12628) as a placebo was supplied by HUMCO Compound- 0.035 105% ing (Texarkana, Texas). A Waters HPLC Model 2695 coupled CHROMATOGRAPHIC CONDITIONS 0.030 100% with a photodiode array detectorAU (PAD) (Model 2996) was used Assay of miconazole and fluconazole in their respective formula- 0.025 for the analytical tests for potency. The analytical column (P/N tions for BUD study was determined95% using a validated stability- 00F-4435-E0; Gemini, C18 5 µ0.020m 150 mm) was purchased from indicating HPLC method. The HPLC% Label Claim 90% system was a Waters 2695 Phenomenex (Torrance, California),0.015 a Mettler-Toledo pH meter Series coupled with a quaternary pump,85% degasser, thermostated Fluconazole 2.863 (Model SevenMulti) was used0.035 0.010for the pH determination. Addition- column compartment, auto-sampler,80% and PAD. For data acquisition ally, a Brookfield DV-E Viscometer0.005 (Model LVDVE115; Middle- and processing, the Empower-Pro Software was0 used. 7 The 14 Gemini 21 28 45 60 90 180 0.030 In Placebo - 1.448 boro, Massachusetts) and analytical0.000 balance (AL-201S; American C18 Column was used for the assay analysis. 0.03M potassiumTesting Time Points in Days 0.025 0 2 4 6 8 10 12 14 Miconazole Upper Limit AU 0.020 Fluconazole Lower Limit Time (Minutes) www.IJPC.com International Journal of Pharmaceutical Compounding 0.015 Vol. 21 No.
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