Abstract
Various tetracyclines and erythromycins have been used rather empirically for the systemic treatment of acne vulgaris for more than a decade. It has been impossible to accurately evaluate clinically the numerous derivatives and to compare their effectiveness with other antibiotics such as clindamycin. As a substitute for this approach, this present study ranks these antibiotics, when given orally, as to their effectivensss in suppressing the fatty acids in sebum in normal volunteers. As a group, the tetracyclines were more effective than the erythromycins in decreasing the fatty acids, but clindamycin was significantly more potent than either.

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