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. For chronic anal fissures, studies show that diltiazem can achieve healing rates similar to nitroglycerin but with fewer side effects, such as headaches, making it a well-tolerated option for many patients, including pregnant and postpartum people. The same sphincter-relaxing effect can also help decrease pressure and discomfort associated with symptomatic hemorrhoids, supporting healing and improving comfort. Because of its favorable side-effect profile, topical diltiazem is often used as a practical long-term treatment option before considering procedures like Botox injections or surgical sphincterotomy.