Viagra is a phosphodiesterase inhibitor. Works to help increase blood flow into the penis during sexual stimulation. This will help you to obtain and / or maintain an erection.
Do not use Viagra if:
* Are allergic to any ingredient in Viagra
* Your doctor will advise you to avoid sexual activity because of heart problems
* Taking nitrates (eg, dinitrate, nitroglycerin) in any form (eg, tablet, capsule, patch, ointment) or nitroprusside
* The use of certain drugs holiday called "hooks" (eg, amyl nitrate, butyl nitrate)
Contact your doctor or health care provider right away if any of these apply to you.
Before using Viagra:
Some diseases may be associated with Viagra. Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:
* If you are taking any prescription or medicine is not without a prescription, herbal preparation, or dietary supplement
* If you have allergies to medicines, foods, or other substances
* If you have any deformation of the penis (such as Peyronie's disease, cavernosal fibrosis), blood problems (eg, sickle cell anemia, leukemia, myeloma), or any other condition that may increase the risk of a prolonged erection (eg,, priapism)
* If you have a history of certain eye problems (eg, retinitis pigmentosa, sudden vision loss, neuropathy optical, macular degeneration)
* If you have a history of liver or kidney problems, hypertension or hypotension, ulcers, bleeding problems, heart problems (eg, heart failure, heart rate, aortic stenosis, angina), or blood vessel problems
* If you have a history of heart attack, stroke, or heart rhythm that threatens life, mostly within 6 months
Some drugs may be associated with Viagra. Tell your health care provider if you are taking any other medicine, especially any of the following:
* Alpha-blockers (eg, doxazosin), amlodipine, medicines for high blood pressure, nitrates (eg, dinitrate, nitroglycerin), or nitroprusside, because severe hypotension with dizziness, vertigo, and fainting may occur
* Azole antifungals (eg, itraconazole), cimetidine, H2 agonists (eg, famotidine), HIV protease inhibitors (eg, ritonavir), macrolide antibiotics (eg, erythromycin), or telithromycin because they may increase the risk of Viagra 's side effects
* Bosentan or rifampin because they may decrease Viagra 's effectiveness
This may not be a complete list of all actions that may occur. Ask your health care provider if Viagra may be associated with other medicines that you take. In accordance with your health care provider before you start, stop, or change the dose of any medicine.
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