If you will be taking this medicine for pulmonary arterial hypertension, your doctor will want to check your progress at regular visits. Check with your doctor right away if you have a sudden decrease in hearing or loss of hearing, which may be accompanied by dizziness and ringing in the ears. Precautions It is important that you tell all of your doctors that you take sildenafil. Use protective measures and ask your doctor if you have any questions about this. Ask your doctor if you have any questions. Do not press on the plunger of the syringe. Children 1 year of age and older weighing 20 to 45 kg—20 mg 3 times a day.Overview Do Medicare prescription drug plans cover sildenafil? Yes. % of Medicare prescription drug plans cover this drug. If my Medicare prescription drug plan covers . The drug is available in 25mg, 50mg and mg options – with 50mg being the standard option. If this dose of Sildenafil doesn’t help you achieve an erection firm enough for . For oral dosage form (tablets): Adults up to 65 years of age—50 milligrams (mg) as a single dose no more than once a day, 1 hour before sexual intercourse. Alternatively, the .