Megalis is among the best drugs for treating impotence. Sildenafil is the active ingredient in the drug. The effects of taking Megalis an hour before engaging in sexual activity last for four to five hours. Before using Megalis, it is best to consult a doctor. Megalis (https://www.mygenerix.com/product/megalis-tablet/) is one of the most popular drugs used to treat impotence. Pets and young children should not be around these tablets.