Impotence is erectile dysfunction, there is no such thing as which of the three western medicines for treating erectile dysfunction is better, the western medicines for treating erectile dysfunction are Sildenafil Citrate Tablets, Vardenafil Hydrochloride Tablets and Avanafil Tablets, etc., and it is not possible to determine which one is better because each of them has its own characteristics. Sildenafil Citrate Tablets, Vardenafil Hydrochloride Tablets and Avanafil Tablets can be used for the treatment of erectile dysfunction, and some patients may experience various adverse reactions such as shock, fatigue, low blood pressure, etc. They are contraindicated in children, pregnant women, as well as breastfeeding women and those who are allergic to the drugs. However, sildenafil citrate tablets need to be taken 30 minutes to 4 hours before sexual intercourse, vardenafil hydrochloride tablets need to be taken about 25 to 60 minutes before sexual intercourse, and avanafil tablets need to be taken orally about 15 minutes before sexual activity. There is no treatment of penile erectile dysfunction three drugs which is better, patients with erectile dysfunction should seek medical attention in time, follow the doctor’s instructions for medication, should not be unauthorized use of drugs.