Different brands may not work the same way. Your doctor may adjust your dose as needed and tolerated. Please expect up to 4 to 6 weeks for reimbursement. Read and follow these instructions carefully before you start using sildenafil and each time you get a refill of your medicine. Sorry something went wrong with your subscription Please, try again in a couple of minutes Retry. Without physical action to the penis, such as that occurring during sexual intercourse, sildenafil will not work to cause an erection.Strengths: 25 mg, 50 mg, mg; Brand: Viagra. Form: oral tablet; Strengths: 25 mg, 50 mg, mg; Adult dosage (ages 18–64 years) Typical dosage: 50 mg, taken as needed about 1 hour before.  · 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. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. The penis is one of the areas where . AdLooking for Mens Male Enhancement? We have almost everything on eBay. But did you check eBay? Check Out Mens Male Enhancement on eBay.1M+ visitors in the past monthHuge Selection · Returns Made Easy · Featured Collections · Daily DealsPopular Links: Bulova · Tennis · Women · Longines · Large · Colombia.