We found one systematic review.5 Versus placebo
No placebo-controlled trials of systemic antibiotics were found.
Versus topical antibiotics
Discussed under topical antibiotics above.
Two RCTs compared penicillin and erythromycin, both finding erythromycin to be more effective.20,21 One very small study (n = 18) found no difference between azithromycin and cephalexin.22 A larger study showed equally good results of erythromycin and dicloxacilin.23 Amoxicillin plus clavulanic acid gave better results than amoxicillin alone, but without reaching significance in a small study.24 No differences were found between cefdinir and cephalexin.25 Cephalexin was equal to erythromycin in a small study.20
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Do You Suffer From the Itching and Scaling of Psoriasis? Or the Chronic Agony of Psoriatic Arthritis? If so you are not ALONE! A whopping three percent of the world’s populations suffer from either condition! An incredible 56 million working hours are lost every year by psoriasis sufferers according to the National Psoriasis Foundation.