Sildenafil does not prevent pregnancy or the spread of sexually transmitted diseases such as human immunodeficiency virus HIV. Sildenafil usually should not be taken more than once every 24 hours. This medicine can cause serious side effects in patients with heart problems. In a study of healthy male volunteers, co-administration of sildenafil at steady state 80 mg t. In addition, patients were asked a global efficacy question and an optional partner questionnaire was administered. Such patients must not apply any out-of-pocket expenses incurred using this Savings Offer toward any government insurance benefit out-of-pocket spending calculations, such as Medicare Part D true out-of-pocket TrOOP costs You are responsible for reporting use of this Savings Offer to any private insurer, health plan, or other third party who pays for or reimburses any part of the prescription filled using this Savings Offer, as may be required.The Savings Offer and Program expire on 12/31/ For further information, call , visit test1.ru, or write: Viatris Inc., P.O. Box , Mission, KS .  · Alternatively, the medicine may be taken 30 minutes to 4 hours before sexual intercourse. Your doctor may adjust your dose if needed. Children—Use is not recommended. For treatment of pulmonary arterial hypertension: For oral dosage forms (suspension or tablets): Adults—20 milligrams (mg) 3 times a day.  · But Viagra may be taken between 30 minutes and 4 hours before you anticipate sexual activity. Viagra tablets may be taken with or without food. Keep in mind that meals high in fat may cause Viagra.