Viagra, Cealis and Levitra work in almost the same way by increasing the blood flow to the penis and providing longer and harder erections. Every drug differs though. For example, Viagra is proved effective for 90% of the men, while Cealis works for about 70%, Viagra works for about 4 hours and Cealis stays in the blood for about 36 hours, that's why it is called the weekend pill. Levitra is so far a "dark horse" that is mostly used by men taking some other medications (lower cholesterol, high blood pressure, etc). Generic Soft Viagra and Soft Cealis are in fact almost as hard as the regular ones, but they are not to be swallowed but to be dissolved under the tongue. This is the best solution for those who want the pills to work faster and take them after a fatty meal when the regular pill will be of no help.

Try wisely and ask your doctor for advice first.