I am a healthy 40 years old Male and I ordered Sildenafil to improve my sexual life. Currently I am using a recommended dose is 50 mg (min 25 mg, max 100mg). So far, it has proven to be a success. I can perform much longer than expected. I can get second erection after ~3 hours after the first one. The drug works faster if consumed in an empty stomach and I don't consume alcohol. One time, I had a big dinner and also consumed alcohol, the drug only works after ~2.5 hours (instead the usual 1 hour wait time). My only warning is that the second erection is much stronger that the first. My advice, is to try from smaller dosage and gradually increase dosage if needed.