The length of time Viagra lasts for will vary from person to person, but it can work for up to 5 hours at a time. This doesn’t mean you will have an erection for 5 hours, it means you will be able to get them easier during this time. Most men will find, that the effects of the pill will start to wear off 2 to 3 hours after first taking it. There are some things that will affect how long Viagra will last for in your case. These are listed in the “What will affect how long Viagra lasts for? To make sure Viagra lasts as long as it’s supposed to, you should always give correct information about your current and past health, and details of any medications you are currently taking when starting a course of treatment with Viagra. One study showed that an hour after taking Viagra for erectile dysfunction, men were able to get erections that lasted 33 mins on average. This dropped to 23 mins if they’d taken it 8 hours beforehand and 16 mins if they took it 12 hours beforehand. Special patient instructions comes with sildenafil. Read the directions carefully before you start using sildenafil and each time you get a refill of your medicine. If you are using the oral liquid, shake the bottle well for at least 10 seconds before measuring each dose. Use the oral syringe provided in the package to measure each dose. This medicine usually begins to work for erectile dysfunction within 30 minutes after taking it. It continues to work for up to 4 hours, although its action is usually less after 2 hours. Use only the brand of this medicine that your doctor prescribed. The dose of this medicine will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of this medicine. If your dose is different, do not change it unless your doctor tells you to do so. Fluconazole dogs Generic name for xanax Find patient medical information for Sildenafil Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. Pictures of Viagra Sildenafil Citrate, drug imprint information, side effects for the patient. Follow all directions on your prescription label. Do not take this. Viagra sildenafil is used to treat erectile dysfunction or impotence in men. Includes. Follow all directions on your prescription label. Do not. Sildenafil (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. Sildenafil (Revatio) is used to improve the ability to exercise in adults with pulmonary arterial hypertension (PAH; high blood pressure in the vessels carrying blood to the lungs, causing shortness of breath, dizziness, and tiredness). Children should not usually take sildenafil, but in some cases, a doctor may decide that sildenafil (Revatio) is the best medication to treat a child's condition. Sildenafil is in a class of medications called phosphodiesterase (PDE) inhibitors. Sildenafil treats erectile dysfunction by increasing blood flow to the penis during sexual stimulation. Sildenafil treats PAH by relaxing the blood vessels in the lungs to allow blood to flow easily. If you are taking sildenafil to treat erectile dysfunction, you should know that it does not cure erectile dysfunction or increase sexual desire. Sildenafil does not prevent pregnancy or the spread of sexually transmitted diseases such as human immunodeficiency virus (HIV). Sildenafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). In combination with sexual stimulation, sildenafil works by increasing blood flow to the penis to help a man get and keep an erection. This drug does not protect against sexually transmitted diseases (such as HIV, hepatitis B, gonorrhea, syphilis). Consult your doctor or pharmacist for more details. Read the Patient Information Leaflet provided by your pharmacist before you start taking sildenafil and each time you get a refill. If you have any questions, ask your doctor or pharmacist. To treat erectile dysfunction-ED, take this drug by mouth as directed by your doctor, usually as needed. Take sildenafil at least 30 minutes, but no more than 4 hours, before sexual activity (1 hour before is the most effective). A high-fat meal may delay how quickly the drug begins to work. Sildenafil directions Treatment Plan Sildenafil - Roman - Men's Health, Viagra Sildenafil Citrate Patient Information Side Effects and Drug. Can amoxicillin treat chlamydia What is viagra and how to use. Medical Video. Loading. Unsubscribe from Medical Video? Cancel Unsubscribe. Working. What is viagra and how to use - YouTube. Viagra Uses, Dosage & Side Effects Information -. How to take sildenafil citrate Viagra - NetDoctor. Viagra starts working about 30-60 minutes after it's taken and lasts up around 5 hours. For most men Viagra starts to wear off 2-3 hours after. Special patient instructions comes with sildenafil. Read the directions carefully before you start using sildenafil and each time you get a refill of your medicine. Viagra, or sildenafil citrate, is one of the most widely used and effective drugs for treating ED, or erectile dysfunction. In many cases, a.