If you have certain health conditions or are taking certain medications, your doctor may tell you to take sildenafil less often. Growing geriatric population and rising healthcare expenditure act as an opportunity for market growth. Children 1 year of age and older weighing 20 to 45 kg—20 mg 3 times a day. It may be difficult to remain firm despite wanting to have sex. The newly published report employs an appealing layout that presents essential data using visually engaging tables, graphs, charts, and figures.Drug Facts Common Brands Viagra Drug Class PDE-5 inhibitor Controlled Substance Classification Not a controlled medication Generic Status Lower-cost generic available Availability Prescription only How Sildenafil (Viagra) works Sildenafil (Viagra) is a phosphodiesterase-5 (PDE-5) inhibitor. There is also a generic version of Viagra available, under the name sildenafil, in 25mg, 50mg, and mg strengths. 3. Downsides If you are between the ages of 18 and 60, take no other medication or have no other medical conditions, side effects you are more likely to experience include. For men experiencing erectile dysfunction (ED), exercising regularly can be nearly as effective as ED medications, such as Viagra (sildenafil), in improving performance, according to a new meta.