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for more information about viagra. VIAGRA is prescribed to treat erectile dysfunction (ED). Important safety information. Do not take VIAGRA if you take nitrates, often prescribed for chest pain, as this may cause a sudden, unsafe drop in blood pressure. In the rare event of an erection lasting more than 4 hours, seek immediate medical help to avoid long-term injury. 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.