If we combine this information with your protected health information, we will treat all of that information as protected health information and will only use or disclose that information as set forth in our notice of privacy practices. You’ll soon start receiving the latest Mayo Clinic health information you requested in your inbox. You may take this medicine with or without food. By controlling the enzyme, sildenafil helps to maintain an erection after the penis is stroked. Sildenafil is also used in both men and women to treat the symptoms of pulmonary arterial hypertension.Generic sildenafil is covered by most Medicare and insurance plans, but some pharmacy coupons or cash prices may be lower. Get sildenafil for as low as $, which is 95% off the average retail price of $ for the most common version, by .  · Maximum dose: 20 mg orally three times a day. Injection: Initial dose: or 10 mg IV bolus three times a day. Comments: No greater efficacy was achieved with oral doses higher than the maximum recommended dose. A 10 mg injection dose is predicted to provide pharmacological effect equivalent to the 20 mg oral dose. Is branded Viagra available? Is generic Viagra (sildenafil) available? How much does Viagra cost online? What dosage is available? Hims: yes: yes – starting at $ per dose of Viagra.