Like Viagra, Sildenafil has a high rate of success — whatever the underlying reasons behind your ED. New Zealand Sildenafil was reclassified in New Zealand in so it could be bought over the counter from a pharmacist. Do not keep outdated medicine or medicine no longer needed. Teva sued to have the latter patent invalidated, but Pfizer prevailed in an August federal district court case. Adults 65 years of age and older—25 mg as a single dose no more than once a day, 1 hour before sexual intercourse. Remove the syringe from the bottle.Compare prices and print coupons for Viagra (Sildenafil) and other drugs at CVS, Walgreens, and other pharmacies. Prices start at $ Print Save Sildenafil Prices, Coupons and Patient Assistance Programs Sildenafil is a member of the agents for pulmonary hypertension drug class and is commonly used for .  · Proper Use Drug information provided by: Merative, Micromedex ® Use sildenafil exactly as directed by your doctor. Do not use more of it and do not use it Missing: walmart.