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Pharmaceutical Manufacturing Handbook: Production and

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304 SEMISOLID DOSAGES: OINTMENTS, CREAMS, AND GELS<br />

TABLE 9 USP Specifi cations for Some Offi cial Gels<br />

Drug<br />

Quality Control Tests Packaging <strong>and</strong> Storage Requirements<br />

Aminobenzoic Minimum fi ll, pH (4.0 – 6.0), Tight, light - resistant containers<br />

acid<br />

alcohol content, <strong>and</strong> assay<br />

Benzocaine Microbial limits, minimum fi ll,<br />

<strong>and</strong> assay<br />

Well - closed containers<br />

Benzoyl peroxide pH (2.8 – 6.6), <strong>and</strong> assay Tight containers<br />

Betamethasone Microbial limits, minimum fi ll, Tight containers; store at 25 ° C,<br />

benzoate <strong>and</strong> assay<br />

excursions permitted between 15<br />

<strong>and</strong> 30 ° C; protect from freezing<br />

Clindamycin Minimum fi ll, pH (4.5 <strong>and</strong> Tight containers<br />

phosphate 6.5), <strong>and</strong> assay<br />

Desoximetasone Minimum fi ll, alcohol content, Collapsible tubes at controlled room<br />

<strong>and</strong> assay<br />

temperature<br />

Dexamethasone Minimum fi ll <strong>and</strong> assay Collapsible tubes; keep tightly closed;<br />

avoid exposure to temperatures<br />

exceeding 30 ° C<br />

Dyclonine pH (2.0 <strong>and</strong> 4.0), <strong>and</strong> assay Collapsible, opaque plastic tubes or in<br />

hydrochloride<br />

tight, light - resistant glass containers<br />

Erythromycin Minimum fi ll <strong>and</strong> assay Tight containers<br />

Fluocinonide Minimum fi ll <strong>and</strong> assay Collapsible tubes or tight containers<br />

Hydrocortisone Minimum fi ll <strong>and</strong> assay Tight containers<br />

Lidocaine Sterility, minimum fi ll, pH Tight containers<br />

hydrochloride (7.0 – 7.4), <strong>and</strong> assay<br />

Metronidazole Minimum fi ll, pH (4.0 <strong>and</strong> Laminated collapsible tubes at<br />

6.5), <strong>and</strong> assay<br />

controlled room temperature<br />

Naftifi ne<br />

Microbial limits, minimum fi ll, Tight containers<br />

hydrochloride pH (5.5 – 7.5), content of<br />

alcohol, <strong>and</strong> assay<br />

Salicylic acid Alcohol content <strong>and</strong> assay Collapsible tubes or tight containers,<br />

preferably at controlled room<br />

temperature<br />

Sodium sulfi de pH (11.5 – 13.5) <strong>and</strong> assay Tight containers at controlled room<br />

temperature or in a cool place<br />

Stannous fl uoride Viscosity, pH (2.8 – 4.0),<br />

stannous ion content, total<br />

tin content, <strong>and</strong> assay<br />

Well - closed containers<br />

Tolnaftate Minimum fi ll <strong>and</strong> assay Tight containers<br />

pH electrodes from Crison, combination electrodes that contain a built - in temperature<br />

probe, a bridge electrolyte chamber <strong>and</strong> movable sleeve junction from<br />

Mettler, <strong>and</strong> combination pH puncture electrodes with spear - shaped tip from<br />

Mettler are some commercially available pH measurement systems for semisolid<br />

formulations.<br />

Alcohol Content Alcohol levels in some gel preparations are determined by gas<br />

chromatographic (GC) methods. Desoxymetasone gel USP <strong>and</strong> naftifi ne hydrochloride<br />

gel USP contain 18 – 24% <strong>and</strong> 40 – 45% (w/w) of ethyl alcohol, respectively. In a<br />

desoxymetasone gel, the sample is dissolved in methanol <strong>and</strong> injected into a gas

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