Make sure you tell your doctor if you have any other medical problems, especially: Abnormal penis, including a curved penis or birth defects of the penis—Chance of problems occurring may be increased and this medicine should be used with caution in these patients. Pediatric Patients: Increased mortality with increasing sildenafil dose was observed in a clinical trial of pediatric patients with PAH. Place the tip of the syringe into you or your child’s mouth and point it towards the cheek. This condition may require prompt medical treatment to prevent serious and permanent damage to your penis. Adults 65 years of age and older—25 mg as a single dose no more than once a day, 1 hour before sexual intercourse. Children 1 year of age and older weighing 20 kg or less—10 mg 3 times a day. There are no adequate and well-controlled studies of sildenafil in pregnant women.Sildenafil is used to treat erectile dysfunction (ED) and to reduce blood pressure in pulmonary arterial hypertension (PAH). It is taken when needed for ED and daily for PAH. A headache, stomach upsets, and flushing are the main side effects, and it should not be taken within 24 hours of a nitrate. 5. Tips. 20 mg sildenafil oral tablet from $ for 10 tablets 25 mg sildenafil oral tablet from $ for 30 tablets 50 mg sildenafil oral tablet from $ for 15 tablets mg . Compare prices and print coupons for Viagra (Sildenafil) and other drugs at CVS, Walgreens, and other pharmacies. Prices start at $ Welcome! You’re in GoodRx Provider Mode. Save $ more and pay just undefined at Walmart with this GoodRx discount. Walmart. $ retail. Save 99% $ chevron_right. One-time offer. Get .