PDE5 inhibitor is a drug component abbreviation, also known as type 5 phosphodiesterase inhibitor, there are already adult drugs on the market, that is, sildenafil or tadalafil, pharmacy trade names Viagra, Jingo, cialis, these drugs can significantly improve the blood supply to the cavernous body of the penis, can enhance the erection of the penis drugs, so that sex becomes more durable and satisfactory. Among the short-acting PDE5 inhibitors are Viagra and Jingo, which can maintain the effect of the drug for up to 8 hours, and you can choose to have sex at any time within 8 hours. The long-acting PDE5 inhibitors are cialis, which can maintain the effect of the drug within 36 hours, these drugs have relatively small side effects, generally patients will feel a slight headache, panic and a variety of other muscle aches and reactions, but they can be tolerated.