Sigmoid, also known as Nicorandil Tablets, works by inhibiting coronary spasms and is commonly used in the treatment of angina pectoris, which can have side effects such as headache, stomatitis, thrombocytopenia, and impaired liver function. Nicorandil Tablet is a nitrate compound, which is commonly used in clinical practice. It can inhibit coronary spasm and increase coronary blood flow without affecting blood pressure, heart rate and conduction, and is often used in the treatment of angina pectoris. Side effects: Headache, stomatitis, thrombocytopenia, impaired liver function, nausea, vomiting and other side effects can occur with this drug. Precautions: Use with caution in patients with severe liver dysfunction, glaucoma, and advanced age. Contraindications: contraindicated for those who are allergic to this product and niacin. Contraindicated in patients taking erectile dysfunction therapeutic agents with phosphodiesterase 5 blocking effect (sildenafil citrate, vardenafil hydrochloride hydrate, tadalafil). Nicorandil tablets should be used under the supervision of a doctor and should not be modified or discontinued without authorization. If any discomfort occurs while taking the medication, you should seek medical attention.