If you take any medicines that have nitrates in them (like nitroglycerin for chest pain)?every day or even once in a while?you should NOT take VIAGRA.
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If you are older than age 65, or have serious liver or kidney problems, your doctor may start you at the lowest dose (25 mg) of VIAGRA. If you are taking protease inhibitors, such as for the treatment of HIV, your doctor may recommend a 25-mg dose and may limit you to a maximum single dose of 25 mg of VIAGRA in a 48-hour period.