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.