Viagra can be taken as long as four hours or as little as 30 minutes before sex. Read more on male sexual health on the Sexual Health Australia site. But now, the repurposing of drugs is becoming far more sophisticated. The concomitant use of erythromycin or strong CYP3A4 inhibitors e. This increased blood flow can cause an erection. If you become pregnant while taking sildenafil, call your doctor.Email With the VIAGRA Savings Card, eligible patients may save 50% on up to 12 prescriptions of brand-name VIAGRA per year.* *Eligible patients could save up to $4, a year. Savings Card only works on brand-name VIAGRA. Terms and conditions apply. LEARN MORE ABOUT VIAGRA Taking VIAGRA How to Get Brand-Name VIAGRA . Compare prices and print coupons for Sildenafil (Generic Revatio and Viagra) and other drugs at CVS, Walgreens, and other pharmacies. Prices start at $ Typical dosing for Sildenafil (Viagra) The typical dose is to take 50 mg of sildenafil (Viagra) by mouth, about 1 hour before sex, as needed. The maximum recommended dose is mg. Don’t take sildenafil (Viagra) more than once daily (at any dose). Written by Brian Leonard, PharmD, BCACP, BCGP.