This will result in better patient outcomes, increased patient quality of life, and fewer adverse events. Your doctor may adjust your dose as needed and tolerated. Your doctor may adjust your dose if needed. What Are the Symptoms of Erectile Dysfunction? This activity describes the indications, actions, adverse effects, and contraindications of sildenafil as an agent in the clinical setting. However, all medications come with risks. Dosing The dose of this medicine will be different for different patients. · Viagra; Descriptions. Sildenafil is used to treat men who have erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. However the dose is usually not more than 40 mg 3 times a day. Children 1 year of age and older weighing 20 to 45 kg—20 mg 3 . the pharmacy you use whether Viagra has a savings program (see the “Financial and insurance assistance” section below) To find out what the average cost of Viagra tablets will be for you, talk. Get sildenafil for as low as $, which is 99% off the average retail price of $ for the most common version, by using a GoodRx coupon. Prices Medicare Drug Info Side Effects Images Sildenafil (Viagra, Revatio) is a moderately priced drug used to treat erection problems in men.