Megalis 20 mg contains the active ingredient tadalafil and is primarily used to treat erectile dysfunction (ED) in men. Tadalafil belongs to a class of medications called phosphodiesterase type 5 (PDE5) inhibitors, which work by increasing blood flow to the during stimulation, allowing for an erection to occur. Megalis 20 mg is a relatively high dosage of tadalafil. It's important to follow the dosage instructions provided by your healthcare provider to ensure safe and effective use. Taking more than the recommended dosage can increase the risk of side effects without providing additional benefit. Tadalafil typically begins to work within 30 minutes to 1 hour after ingestion, although the onset may vary among individuals. The effects of Megalis 20 mg can last for up to 36 hours, earning it the nickname "the weekend pill." This prolonged duration of action provides flexibility in the timing of activity.