A typical dose of Viagra is 25,50 or 100 mg, so your 3-5 doses of 20 mg isn't even atypical. Also, there are plenty of warnings that come with Viagra usage. You

A typical dose of Viagra is 25,50 or 100 mg, so your 3-5 doses of 20 mg isn't even atypical. Also, there are plenty of warnings that come with Viagra usage. You may have not taken the time to read them.