Your doctor will tell you not to take sildenafil if you are taking street drugs containing nitrates. In many of the studies, of both fixed dose and titration designs, daily diaries were kept by patients. Sildenafil for pulmonary hypertension can also be known by the brand names Revatio and Grandipam. The products discussed in this site may have different product labeling in different countries. How to take tablets Swallow tablets whole with a drink of water or juice but not grapefruit juice. The patient addressed both questions at the final visit for the last 4 weeks of the study. These effects on the metabolite are not expected to be of clinical consequence.VIAGRA is supplied as blue, film-coated, rounded-diamond-shaped tablets containing sildenafil citrate equivalent to 25 mg, 50 mg, or mg of sildenafil. Tablets are debossed with PFIZER on one side and VGR25, VGR50 or VGR on the other to indicate the dosage strengths. Close. Sildenafil Prices, Coupons and Patient Assistance Programs. Sildenafil is a member of the agents for pulmonary hypertension drug class and is commonly used for Erectile . AdOver 50K Customers Save on Prescriptions Each Week Using Free SingleCare® Discount Cards. Save Up to 80% on Prescriptions at Over 35, Pharmacies Nationwide with a Free Rx CouponExplore: Bonus savings, Browse prescriptions, Discount cards, Drug classe.