Tadanafil is usually taken for a 3-month course of treatment. Tadanafil is a commonly used medication for the treatment of erectile dysfunction, and it is generally recommended that patients need to take it for 3 consecutive months to effectively improve erectile function. Common adverse reactions to tadanafil include eyelid swelling, eye pain, and conjunctival congestion, which are generally transient, mild, or moderate. In addition, tadanafil should not be taken with nitrates. Contraindications for tadanafil include males under 18 years of age, patients with severe hepatic insufficiency, patients who have lost sexual function, and patients with angina who are taking nitroglycerin, among others. In addition, tadanafil has certain risks, patients need to get the guidance of a specialist, not to take the drug without authorization. If you have any other questions, it is recommended to consult a specialized doctor.