The effect of fluocortin butylester (FCB) in the topical treatment of perennial rhinitis was investigated in a double-blind study using a cross-over technique. The daily dose was 4 mg. Of the 30 patients who completed the trial, 26 had either allergy or nasal eosinophilia. 20 of the 30 patients preferred FCB to placebo. Moreover, there was a positive, but not statistically significant, therapeutic effect according to the patient score cards (0.1 less than p less than 0.2). In other words, the results are positive, but not definite. It is concluded that possibly the dose ought to be increased to obtain a more reliable effect.