Impotence The PDE5 inhibitor drug class includes the Vilitra 20 tablets. It relaxes the blood vessels in the penis. An erection is the result of blood flowing into your penis when you become sexually excited. This drug only helps people who are sexually aroused get more erections. Despite its high effectiveness, it is recommended to take it 30 minutes prior to sexual activity. Avoid taking this medication if you also take nitrates, which are often prescribed for chest pain. Vilitra 20 tablets, which can be purchased online, are used to treat erectile dysfunction (ED) and premature discharge separately.