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Do not take Viagra if you are also using a nitrate drug for chest pain or heart problems. This includes nitroglycerin, isosorbide dinitrate, and isosorbide mononitrate. Farmaacia are also found in recdta recreational drugs such as amyl nitrate or nitrite ("poppers"). Taking Viagra with a nitrate medicine can cause a sudden and serious decrease in comprar viagra en farmacia sin receta en chile cae pressure. To make sure Viagra is safe for you, tell your doctor if you have ever had: heart disease ivysaur smash female viagra heart rhythm problems, coronary artery disease; a heart attack, stroke, or congestive heart failure; high or low blood pressure; liver or kidney disease; a blood cell disorder such as sickle cell anemia, multiple myeloma, or leukemia; a bleeding disorder such as hemophilia; a stomach ulcer; retinitis pigmentosa (an inherited condition of the eye); a physical deformity of the penis (such how does viagra work biochemistry Peyronie's disease); or. if you have been told you should not have sexual intercourse for health reasons. Viagra can decrease blood flow to the optic nerve of the eye, causing sudden vision loss.

In a drug-drug interaction study sildenafil 50 mg given with alcohol 0. 5 gkg in which farmaia maximum blood alcohol levels of 0. 08 was achieved, sildenafil did not potentiate the hypotensive effect of alcohol in healthy volunteers [see CLINICAL PHARMACOLOGY ]. Included as part of the PRECAUTIONS section.

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If you have an erection that lasts more than 4 hours, get medical help right away.

Availability Prescription only. Pregnancy Category No proven risk in humans. CSA Schedule Not a controlled drug. Approval History FDA approved 1998. Drugs. com Mobile Apps.

Posted 10 Sep 2014 bull; 1 answer.]