Thiazide diuretics are one of the first-line antihypertensive agents for primary hypertension. In this report, a hypertensive male patient using trichlormethiazide complained about inability to maintain sufficient erection time. After the patient discontinued trichlormethiazide, the problem disappeared. Search focusing on package inserts, Micromedex and UpToDate found no report of trichlormethiazide-induced erectile dysfunction. Not until our search was expanded to include original articles and studies were reports on trichlormethiazide-induced sexual dysfunction discovered. We reviewed the studies about the prevalence of erectile dysfunction in hypertensive men, antihypertensive agents induced male sexual dysfunction, and the treatment for erectile dysfunction. When antihypertensive agents are suspected to induce erectile dysfunction, healthcare professionals should consider discontinuing thiazide diuretics or β-blokcers. Instead, angiotensin-converting enzyme inhibitors (ACEI), angiotensin receptor blockers (ARB) or α-1 blockers which have neutral or even beneficial effects on erectile function should be used.