In a study of healthy male volunteers, co-administration of sildenafil at steady state 80 mg t. The studies that established benefit demonstrated improvements in success rates for sexual intercourse compared with placebo. Although the interaction between other protease inhibitors and sildenafil has not been studied, their concomitant use is expected to increase sildenafil levels. One-third to one-half of the subjects in these studies reported successful intercourse at least once during a 4-week, treatment-free run-in period. The concomitant use of erythromycin or strong CYP3A4 inhibitors e.For most patients, the recommended dose is 50 mg taken, as needed, approximately 1 hour before sexual activity. However, VIAGRA may be taken anywhere from 30 minutes to 4 hours before sexual activity ()Based on effectiveness and toleration, may increase to a maximum of mg or decrease to 25 mg ()Maximum recommended . Hims offers generic Viagra starting at $3 per pill, and branded Viagra starting at $ per pill. To start with Hims, people must fill in an online questionnaire. Expand to see all locations within your area. Get Coupon Add to Pricing Basket SHOW LOCATIONS FUTRELL PHARMACY OF LITTLETON $ E S Main St.