Doctor if I take weak erection drug like viagra (sildenafil) how long will it take before it take effect and is there any possible side effects?

Viagra (sildenafil) Viagra (sildenafil) starts to work in about 30-60 minutes. There is a lot of fake viagra (sildenafil) being sold online so i would recommend buying directly from pfizer at viagra (sildenafil).Com to be safe. The complete list of side effects is printed on the front page of viagra (sildenafil).Com. It is a generally safe drug, but if you have sudden loss of vision or your erection lasts more than 4 hours seek emergency medical advice.