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.
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.
Assay
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 2155
Pharmacopeial Forum: Volume No. 28(2) Page 251
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