· Viagra; Descriptions. Sildenafil is used to treat men who have erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines Missing: criteria.You may take this medicine with or without food. Storage Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Use only the brand of this medicine that your doctor prescribed. If you see air bubbles in the syringe, repeat the steps. To use the oral liquid: Shake the bottle well for at least 10 seconds before each use. Rarely reported side effects include: an erection that will not go away priapism. The following information includes only the average doses of this medicine.Overdose Talk with your doctor Q&A Drug Images Viagra (sildenafil) is a prescription drug that’s used to treat erectile dysfunction (ED). The drug comes as a . 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 . This means that 4 hours after you take a dose, your body has cleared half of the dose. In most cases, it takes about 5 half-lives for your body to completely Missing: criteria.This medicine can cause serious side effects in patients with heart problems. Click here for an email preview. Alternatively, the medicine may be taken 30 minutes to 4 hours before sexual intercourse. 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. Keep out of the reach of children. If used together, your doctor may change the dose or how often you use this medicine, or give you special instructions about the use of food, alcohol, or tobacco. Proper Use Use sildenafil exactly as directed by your doctor.

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