This medicine usually begins to work for erectile dysfunction within 30 minutes after taking it. Ask your doctor if you have any questions. Place the tip of the syringe into you or your child’s mouth and point it towards the cheek. Data shared with Viatris will be aggregated and de-identified; it will be combined with data related to other Savings Offer redemptions and will not identify you Viatris reserves the right to rescind, revoke, or amend this Savings Offer without notice No membership fees. Read and follow these instructions carefully before you start using sildenafil and each time you get a refill of your medicine. The following information includes only the average doses of this medicine. Do not use more of it and do not use it more often than your doctor ordered.Sildenafil oral tablet is used to treat erectile dysfunction (ED). It’s also used to treat pulmonary arterial hypertension (PAH). What is sildenafil? Sildenafil is a prescription . What is Viagra? Viagra relaxes muscles found in the walls of blood vessels and increases blood flow to particular areas of the body. Viagra is used to treat erectile dysfunction . Sildenafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). In combination with sexual stimulation, sildenafil works by increasing blood flow to .