To assess the efficacy and tolerance of fluconazole in the treatment of oesophageal candidiasis, 47 AIDS patients with this infection were enrolled in an open prospective study using fluconazole 100 mg given orally once daily. Clinical cure was obtained in all of 41 evaluable patients, with confirmation of cure in all of 31 patients who underwent post-treatment oesophagoscopy. Forty patients were followed up for at least 30 days; none suffered a relapse of oesophagitis but seven had a recurrence of stomatitis which was effectively treated with fluconazole. Fluconazole was well tolerated. Nausea was noted in three patients one of whom interrupted therapy. Transient mild elevation of ALT/AST was noted in five of 41 patients (12%). Fluconazole appears to be a safe and effective agent for oral therapy of oesophageal candidiasis associated with AIDS.