Fifty-one patients with acne vulgaris were included in a double-blind trial to assess the therapeutic effect of 250 mg. tetracycline hydrochloride twice daily for three months. The results, assessed clinically and photographically, showed that tetracycline hydrochloride had a statistically significant beneficial effect. Hence, since it is cheap and rarely has side-effects in healthy young adults, its use is suggested, as well as local therapy, in the more severe forms of acne.
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Lane et al. (1969) studied this question.
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