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Background & Aims: Thalidomide decreases production of tumor necrosis factor α, a proinflammatory cytokine associated with Crohn's disease (CD). In this study the safety, tolerance, and efficacy of low-dose thalidomide were evaluated for treatment of moderate-to-severe, steroid-dependent CD. Methods: Twelve adult male patients with Crohn's Disease Activity Index (CDAI) scores of ≥250 and ≤500 despite ≥20 mg prednisone/day were enrolled. The first 6 patients received 50 mg thalidomide every night, the next 6 received 100 mg every night. Steroid doses were stable during the first 4 weeks of treatment, then tapered during weeks 5–12. CDAI was used to assess response. Results: (1) Disease activity improved consistently in all patients during weeks 1–4: 58% response, 17% remission. (2) Clinical improvement was generally maintained despite steroid taper during weeks 5–12. All patients were able to …