Does viagra affect sperms and men fertility?what is the risk of taking viagra once daily on longrun?

No. viagra will not affect your sperm count or your fertility. It doesnt help or harm either one. It only increases the blood flow to the penis to allow it to fill with blood and therefore have an erection. Ask your Dr about taking it on a daily basis. I'm not sure on Viagra, but they do have these types of drugs that are taken in lower doses on a daily basis rather than just prior to a sexual event to allow for more sponteneity.