One hundred and fifteen patients suffering from acute exacerbations of chronic bronchitis took part in a double-blind, multicentre, clinical trial designed to compare the therapeutic efficacy and tolerability of ampicillin and minocycline hydrochloride, a new, long-acting, semi-synthetic tetracycline. Both antibiotics were equally successful in treatment, there being no statistically significant difference between the two in any of the parameters studied. Side-effects were few and far between. Only one patient out of the 57 who took minocycline, complained of dizziness.

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