Viagra (sildenafil citrate) is a commonly used PDE5 inhibitor that can be taken to treat erectile dysfunction in males that are unable to have sex without this kind of assistance. You may need to be taking this drug if you are unable to get an erection hard enough to have sex. Viagra is supposed to be taken as needed, but you must never use it too often - more often than once every 24 hours. Using Viagra more often can lead to the development of unpleasant health effects. As a result of that, you may not benefit from the treatment as much. Viagra is usually well tolerated and only such mild side effects as headaches, stomach pain, nausea, diarrhea, nasal congestion, facial flushing, or color vision problems can be experienced. You will need to be sure you report those in case they get more severe. Such serious side effects as rash, fainting, chest pain, dizziness, sudden severe loss of vision, lightheadedness, priapism, shortness of breath, loss of hearing, ringing in ears, itching or burning during urination, or blurred vision must be reported to your doctor right away. If there are any questions you have, make sure you ask them before starting the treatment.
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