A double-blind study was carried out to investigate the possibility of therapeutic effect of levamisole on recurrent progenital herpes. One hundred and nine patients, including 53 females, entered the study, but only 75 completed. Levamisole, 50 mg three times daily for 3 days, was started at the first sign of recurrence. The study period consisted of 6 visits or 12 months, whichever came first...