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Stability of Midazolam Intranasal Formulation for the Treatment of Status Epilepticus in Dogs

Author(s):  Elder Deborah Lester, Zheng Bo, White Catherine A, Li Dawei

Issue:  Jan/Feb 2011 - Volume 15, Number 1
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Page(s):  74-77

Stability of Midazolam Intranasal Formulation for the Treatment of Status Epilepticus in Dogs Page 1
Stability of Midazolam Intranasal Formulation for the Treatment of Status Epilepticus in Dogs Page 2
Stability of Midazolam Intranasal Formulation for the Treatment of Status Epilepticus in Dogs Page 3
Stability of Midazolam Intranasal Formulation for the Treatment of Status Epilepticus in Dogs Page 4

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Abstract:  The purpose of this study was to determine the stability of an extemporaneously prepared intranasal formulation of midazolam for the treatment of status epileptus in dogs. An aqueous solution of midazolam (50 mg/mL) was prepared by dissolving 500 mg of midazolam powder in sterile water for injection containing carbopol (0.4%) and benzalkonium chloride (0.01%), pH 2.8 to 3.0. Five identical formulations were prepared and placed in lightresistant glass containers and stored under refrigeration (3°C to 5°C) and at room temperature (22°C to 24°C). Samples were collected from each container at 0, 2, 4, 8, and at 1, 3, 7, 14, 30, 45, 60, and 90 days. Each sample was diluted to an expected concentration of 200 mcg/mL and assayed using high-performance liquid chromatographic analysis with ultraviolet detection. The formulation was shown to be stable for 30 days under refrigeration and at room temperature. The formulation was shown to be unstable under both storage conditions at and beyond 45 days. Stability is defined as the retention of at least 90% of the initial concentration. It is suggested that the extemporaneously prepared midazolam intranasal formulation can safely be stored for 30 days at room temperature or under refrigeration.

Related Keywords: Deborah Lester Elder, PharmD, RPh, Bo Zheng, PhD, Catherine A. White, PhD, Dawei Li, DPhil of Pharmacy Candidate, midazolam, benzodiazepines, intranasal administration, dogs, canine, status epilepticus, antiepileptic drug, stability, storage

Related Categories: PEER-REVIEWED, STABILITIES, COMPATIBILITIES, VETERINARY, DOSAGE FORMS/DRUG CARRIERS, NEUROLOGY, STORAGE

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