Megalis 10 mg contains the active ingredient tadalafil, which is commonly used to treat erectile dysfunction (ED) and benign prostatic hyperplasia (BPH). Tadalafil works by increasing blood flow to the penis during sexual stimulation, helping to achieve and maintain an erection. It is also used to treat the symptoms of BPH, such as difficulty urinating. Before taking Megalis 10 mg, it is crucial to discuss your medical history with your doctor, especially if you have any pre-existing conditions or are taking other medications, to ensure it's the right treatment for you. If you experience an erection lasting more than 4 hours, seek emergency medical treatment. This is known as priapism, and it can cause permanent damage to the penis if not treated promptly. If you have a history of heart disease, recent heart attack, stroke, low blood pressure, or other serious heart conditions, consult your doctor before using Megalis. You may need a lower dose or an alternative treatment.