Topical diltiazem helps treat anal fissures and painful hemorrhoids by relaxing the internal anal sphincter muscle. This reduces pressure in the anal canal, improves blood flow to irritated or damaged tissue, and helps relieve pain caused by muscle spasm.
The clinical results speak for themselves: in a randomized controlled trial, diltiazem healed chronic anal fissures in over 91% of patients within 6 weeks — outperforming nitroglycerin (GTN) with a significantly higher healing rate and zero headache side effects. A separate double-blind randomized trial published in Annals of Surgery found that topical diltiazem matched Botox injections’ healing rate at 3 months, with no needles required. And for patients looking to avoid surgery altogether, research shows diltiazem eliminates the need for sphincterotomy in up to 70% of cases — even among patients who had already failed other treatments.
The same sphincter-relaxing effect can also help decrease pressure and discomfort associated with symptomatic hemorrhoids, supporting healing and improving overall comfort. Because of its strong efficacy and favorable side-effect profile — with no headache risk unlike nitroglycerin — topical diltiazem is also a preferred option for pregnant and postpartum patients.