Never take VIAGRA if you take any medicines with nitrates. This includes nitroglycerin. Your blood pressure could drop quickly. It could fall to an unsafe or life-threatening level. Erectile dysfunction means a man cannot get or keep an erection. Health problems, injury, or side effects of drugs may cause ED. The cause may not be known. VIAGRA is used to treat ED in men. When you want to have sex, VIAGRA can help you get and keep an erection when you are sexually excited. You cannot get an erection just by taking the pill. Only your doctor can prescribe VIAGRA. VIAGRA does not cure ED. VIAGRA does not protect you or your partner from STDs (sexually transmitted diseases) or HIV. You will need to use a condom. VIAGRA is not a hormone or an aphrodisiac.
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