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Avar Gel (Sodium Sulfacetamide / Sulfur) - Description and Clinical Pharmacology

 
 



DESCRIPTION

Each gram of AVAR™ Gel (sodium sulfacetamide 10% and sulfur 5%) contains 100 mg of sodium sulfacetamide and 50 mg of colloidal sulfur in an aqueous based emollient gel vehicle containing purified water USP, sodium magnesium silicate, emulsifying lipids, nicotinamide, disodium EDTA, sodium thiosulfate, zinc oxide, benzyl alcohol, phenoxyethanol, glycerin, xanthan gum, sodium lactate, polyacrylamide, C13-C14 isoparaffin, laureth-7, fragrance.

Each gram of AVAR™ Green (sodium sulfacetamide 10% and sulfur 5%) Color Corrective Gel contains 100 mg of sodium sulfacetamide and 50 mg of colloidal sulfur in an aqueous based emollient gel vehicle containing purified water USP, sodium magnesium silicate, emulsifying lipids, nicotinamide, disodium EDTA, sodium thiosulfate, zinc oxide, benzyl alcohol, phenoxyethanol, glycerin, xanthan gum, sodium lactate, polyacrylamide, C13-C14 isoparaffin, laureth-7, fragrance, chromium oxide green.

Each gram of AVAR™ Cleanser (sodium sulfacetamide 10% and sulfur 5%) contains 100 mg of sodium sulfacetamide and 50 mg of colloidal sulfur in a mild aqueous based cleansing vehicle containing purified water USP, sodium magnesium silicate, sodium thiosulfate, propylene glycol, sodium lauryl sulfate, cetyl alcohol, stearyl alcohol, phenoxyethanol, fragrance.

Sodium sulfacetamide is a sulfonamide with antibacterial activity while sulfur acts as a keratolytic agent. Chemically sodium sulfacetamide is N-[(4-aminophenyl) sulfonyl]-acetamide, monosodium salt, monohydrate. The structural formula is:

CLINICAL PHARMACOLOGY

The most widely accepted mechanism of action of sulfonamides is the Woods-Fildes theory which is based on the fact that sulfonamides act as competitive antagonists to para-aminobenzoic acid (PABA), an essential component for bacterial growth. While absorption through intact skin has not been determined, sodium sulfacetamide is readily absorbed from the gastrointestinal tract when taken orally and excreted in the urine, largely unchanged. The biological half-life has variously been reported as 7 to 12.8 hours.

The exact mode of action of sulfur in the treatment of acne is unknown, but it has been reported that it inhibits the growth of Propionibacterium acnes and the formation of free fatty acids.

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