Cyclizine Hydrochloride
(sye' kli zeen hye'' droe klor' ide).
C18H22N2·HCl
302.84
302.84Piperazine, 1-(diphenylmethyl)-4-methyl-, monohydrochloride.
1-(Diphenylmethyl)-4-methylpiperazine monohydrochloride
[303-25-3].» Cyclizine Hydrochloride contains not less than 98.0 percent and not more than 100.5 percent of C18H22N2·HCl, calculated on the dried basis.
Packaging and storage—
Preserve in tight, light-resistant containers.
USP Reference standards 
11
—
11—
USP Cyclizine Hydrochloride RS 
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Identification—
B:
Dissolve 500 mg in 10 mL of a mixture of 3 volumes of alcohol and 2 volumes of water, warming if necessary. Cool the solution in an ice bath, add 1 mL of 1 N sodium hydroxide and 20 mL of water, stir, and filter: the precipitate of the base so obtained, washed with water and dried in vacuum at 60
for 2 hours, melts between 106 and 109.
for 2 hours, melts between 106 and 109.
C:
It responds to the tests for Chloride 191.
191.
pH 791:
between 4.5 and 5.5, determined potentiometrically in a 1 in 50 solution, the solvent being a mixture of 2 volumes of alcohol and 3 volumes of water.
791:
between 4.5 and 5.5, determined potentiometrically in a 1 in 50 solution, the solvent being a mixture of 2 volumes of alcohol and 3 volumes of water.
Loss on drying 731—
Dry it at 120 for 3 hours: it loses not more than 1.0% of its weight.
731—
Dry it at 120 for 3 hours: it loses not more than 1.0% of its weight.
Residue on ignition 281:
not more than 0.2%.
281:
not more than 0.2%.
Ordinary impurities 466—
466—
Test solution:
methanol.
Standard solution:
methanol.
Eluant:
a mixture of chloroform, methanol, and ammonium hydroxide (80:20:1).
Visualization:
2.
Assay—
Transfer to a beaker about 400 mg of Cyclizine Hydrochloride, accurately weighed, and dissolve in 80 mL of glacial acetic acid. Add 10 mL of mercuric acetate TS, and titrate with 0.1 N perchloric acid VS, determining the endpoint potentiometrically. Perform a blank determination, and make any necessary correction. Each mL of 0.1 N perchloric acid is equivalent to 15.14 mg of C18H22N2·HCl.
Auxiliary Information—
Please check for your question in the FAQs before contacting USP.
| Topic/Question | Contact | Expert Committee |
|---|---|---|
| Monograph | Elena Gonikberg, Ph.D.
Principal Scientific Liaison 1-301-816-8251 |
(SM32010) Monographs - Small Molecules 3 |
| Reference Standards | RS Technical Services 1-301-816-8129 rstech@usp.org |
USP35–NF30 Page 2785