I had sexual problems because I was very tired after the work. It looked like this: during sex my penis became weak, which caused discomfort. After long hesitation, I decided to buy Levitra 20mg. I split it in two and take the dose 2 hours before sex. The only side effect was the blood rush to the face. It’s not very nice, but also not critical. My sex was perfect!!!! The girl was shocked. Erection was great; I didn’t even have to make efforts. Sex lasted 1 hour until she begged. I made a second effort in half an hour, it happened again, but without problems! However, you should be careful with the dose, as the drug can increase your blood pressure. http://www.health-canada-pharmacy.com/erectile-dysfunction.html