Amantadine Hydrochloride Oral Solution
» Amantadine Hydrochloride Oral Solution contains not less than 95.0 percent and not more than 105.0 percent of the labeled amount of amantadine hydrochloride (C10H17N·HCl).
Packaging and storage Preserve in tight containers.
USP Reference standards 11
Identification, Infrared Absorption 197S
Cell: 1 mm.
Solution Place a volume of Oral Solution, equivalent to about 200 mg of amantadine hydrochloride, in a vessel, dissolve in 0.1 N hydrochloric acid, and filter. Transfer the filtrate to a separator, add 10 mL of 0.5 N sodium hydroxide, and extract with 5 mL of methylene chloride. Filter the extract through anhydrous sodium sulfate, and rinse the anhydrous sodium sulfate with 2 mL of methylene chloride.
Internal standard solution, Standard preparation, and Chromatographic system Proceed as directed in the Assay under Amantadine Hydrochloride Capsules.
Assay preparation Pipet 5.0 mL of the Oral Solution into a 250-mL conical flask, and add 45 mL of 1.0 N sodium hydroxide and 50.0 mL of Internal standard solution. Shake for 60 minutes, and collect the hexane layer (Assay preparation).
Procedure Proceed as directed in the Assay under Amantadine Hydrochloride Capsules. Calculate the quantity, in mg, of amantadine hydrochloride (C10H17N·HCl) in the portion of Oral Solution taken by the formula:
50C(RU / RS)in which C is the concentration, in mg per mL, of USP Amantadine Hydrochloride RS in the Standard preparation; and RU and RS are the peak response ratios obtained from the Assay preparation and the Standard preparation, respectively.
Auxiliary Information Please check for your question in the FAQs before contacting USP.
USP35NF30 Page 2155Pharmacopeial Forum: Volume No. 28(2) Page 251