Nitroglycerin ointment is a kind of topical ointment, which can be applied to the treatment of anal fissure, and generally can reduce the muscle tension after using it for three to seven days, so as to reduce the anal pain and other manifestations of patients. Nitroglycerin ointment’s main ingredient is nitroglycerin, which can effectively relieve the spasm of the anal sphincter muscle, and can also achieve the efficacy of lowering anal tension, most patients use the drug three to seven days after the onset of the effect. Most patients take the medication for three to seven days. The time to onset of action is affected by the patient’s condition, age, and the dosage of the medication. If the patient has an acute manifestation of severe anal fissure symptoms, you can also apply nitroglycerin ointment to treat the fissure, and the fissure can be healed in about a week’s time with the medication. During the medication period, it is necessary to pay attention to the hygiene and cleanliness of the anal area, dry, and prevent the emergence of infection and other conditions. Although nitroglycerin ointment can reduce anal tension, but patients need to use the drug under the guidance of a professional doctor, do not buy, unauthorized use, so as not to cause serious adverse reactions.