If you see air bubbles in the syringe, repeat the steps. The effects may be increased because of slower removal of the medicine from the body. Some people may also have ringing in their ears tinnitus or dizziness. Children 1 year of age and older weighing 20 to 45 kg—20 mg 3 times a day. Read and follow these instructions carefully before you start using sildenafil and each time you get a refill of your medicine. There is a problem with information submitted for this request.Follow your doctor’s instructions. During sexual activity, if you become dizzy or nauseated, or have pain, numbness, or tingling in your chest, arms, neck, or jaw, stop and call your doctor right away. You could be having a serious side effect of sildenafil. Store at room temperature away from moisture and heat. RESOURCES GETTING STARTED WITH VIAGRA Your doctor has determined that VIAGRA may be right for you. Follow his or her instructions carefully to help you get the best results from treatment. VIAGRA is available by prescription only in 25 mg, 50 mg, and mg tablets. Not actual size. TIPS FOR TAKING VIAGRA.  · For information on the dosage of Viagra, including its pill form, strengths, and how to take the drug, keep reading. For a comprehensive look at Viagra, see this article.