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Stability of extemporaneously compounded amiloride nasal spray

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  • Venkata Yellepeddi
  • Casey Sayre
  • Anna Burrows
  • Kevin Watt
  • Simon Davies
  • John Strauss
  • Marco Battaglia

Abstract

Anxiety disorders (AD) are the most common mental conditions affecting an estimated 40 million adults in the United States. Amiloride, a diuretic agent, has shown efficacy in reducing anxious responses in preclinical models by inhibiting the acid-sensing ion channels (ASIC). By delivering amiloride via nasal route, rapid onset of action can be achieved due to direct “nose-to-brain” access. Therefore, this study reports the formulation, physical, chemical, and microbiological stability of an extemporaneously prepared amiloride 2 mg/mL nasal spray. The amiloride nasal spray was prepared by adding 100 mg of amiloride hydrochloride to 50 mL of sterile water for injection in a sterile reagent bottle. A stability-indicating high-performance liquid chromatography (HPLC) method was developed and validated. Forced-degradation studies were performed to confirm the ability of the HPLC method to identify the degradation products from amiloride distinctively. The physical stability of the amiloride nasal spray was assessed by pH, clarity, and viscosity assessments. For chemical stability studies, samples of nasal sprays stored at room temperature were collected at time-points 0, 3 hr., 24 hr., and 7 days and were assayed in triplicate using the stability-indicating HPLC method. Microbiological stability of the nasal spray solution was evaluated for up to 7 days based on the sterility test outlined in United States Pharmacopoeia (USP) chapter 71. The stability-indicating HPLC method identified the degradation products of amiloride without interference from amiloride. All tested solutions retained over 90% of the initial amiloride concentration for the 7-day study period. There were no changes in color, pH, and viscosity in any sample. The nasal spray solutions were sterile for up to 7 days in all samples tested. An extemporaneously prepared nasal spray solution of amiloride hydrochloride (2 mg/mL) was physically, chemically, and microbiologically stable for 7 days when stored at room temperature.

Suggested Citation

  • Venkata Yellepeddi & Casey Sayre & Anna Burrows & Kevin Watt & Simon Davies & John Strauss & Marco Battaglia, 2020. "Stability of extemporaneously compounded amiloride nasal spray," PLOS ONE, Public Library of Science, vol. 15(7), pages 1-11, July.
    • Handle: RePEc:plo:pone00:0232435
    DOI: 10.1371/journal.pone.0232435
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