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For example, you should not take Viagra if you take nitrate medications to treat chest pain. You should also avoid taking Viagra if you take a drug called riociguat (Adempas). Taking Viagra with these medications can cause a dangerous drop in your blood pressure that leads to heart attack or stroke. If you’re sexually aroused, Viagra should work to help you get or keep an erection within 30 minutes to 2 hours.

If 50mg has worked, but not to your expectation or to its full effect, you can then try 100mg tablets. Generic sildenafil citrate comes in preparations of 25mg, 50mg, and 100mg. Your first prescription will usually be for 50mg, which is the recommended starting dose.

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