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Benzamycin

This drug is a combination of two active ingredients, benzoyl peroxide and erythromycin, which are applied topically to treat mild to moderate acne. Benzoyl peroxide breaks down and removes the outer layer of skin and exerts antibacterial activity. Erythromycin is used as an antibacterial agent.

Interactions with Dietary Supplements

Vitamin E
Animal studies show that benzoyl peroxide promotes tumor growth, yet the significance of this finding in humans is unknown. A test tube study showed that when exposed to vitamin E, human skin cells were more resistant to damage caused by benzoyl peroxide.1 Controlled research is needed to determine whether use of benzoyl peroxide products by humans promotes tumor growth and whether vitamin E might prevent this damage.

Zinc
Using a topical zinc solution with topical erythromycin increases the effectiveness of the antibiotic in the treatment of inflammatory acne.2

Summary of Interactions for Benzamycin

Depletion or interference None known
Adverse interaction None known
Side effect reduction/prevention Vitamin E*
Supportive interaction Zinc
Reduced drug absorption/bioavailability None known

For the convenience of the reader, the information in the summary is categorized as follows: “Depletion or interference” indicates the drug may deplete or interfere with the absorption or function of the supplement or herb. “Adverse interaction” indicates that the supplement or herb used together with the drug may result in undesirable effects. “Side effect reduction/prevention” indicates the supplement or herb may reduce the likelihood and/or severity of a potential side effect caused by the drug. “Supportive interaction” indicates the supplement or herb may support or aid the function of the drug. “Reduced drug absorption/bioavailability” indicates that the supplement or herb may decrease the absorption and/or activity of the drug in the body. An asterisk (*) next to an item in the summary indicates that the interaction is supported only by weak, fragmentary, and/or contradictory scientific evidence.

References:

1. Babich H, Zucherbraun HL, Wurzburger BJ, et al. Benzoyl peroxide cytotoxicity evaluated in vitro with human keratinocyte cell line, RHEK-1. Toxicology 1996;106:187–96.

2. Toyoda M, Morohashi M. An overview of topical antibiotics for acne treatment. Dermatology 1998;196:130–4.