Thirteen psoriatic patients with hypertension during the course of cyclosporin A therapy were treated for 25 months with a calcium channel blocker, sustained-release nifedipine, to study the clinical antihypertensive effects and adverse events during treatment with both drugs. Seven of the 13 patients had exhibited a subclinical hypertensive state before cyclosporin A therapy. Both systolic and diastolic blood pressures of these 13 patients were decreased significantly after 4 weeks of nifedipine therapy, and blood pressure was maintained within the normal range thereafter for 25 months. The adverse events during combined therapy with cyclosporin A and nifedipine included an increase in blood urea nitrogen levels in 9 of the 13 patients and development of gingival hyperplasia in 2 of the 13 patients. Our findings indicate that sustained-release nifedipine is useful for hypertensive psoriatic patients under long-term treatment with cyclosporin A, but that these patients should be monitored for gingival hyperplasia.