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Warnings/Precautions
Do not take Viagra if you are taking any nitrate-based drug,
including nitroglycerin patches (Nitro-Dur, Transderm-Nitro),
nitroglycerin ointment (Nitro-Bid, Nitrol), nitroglycerin pills
(Nitro-Bid, Nitrostat), and isosorbide pills (Dilatrate-SR, Isordil,
Sorbitrate). Combining Viagra with these drugs can cause a severe
drop in blood pressure.
If you have heart problems severe enough to make sexual activity
a danger, you should avoid using Viagra. Use it cautiously if
you've had a heart attack, stroke, or life-threatening heart irregularities
within the past 6 months. Be equally cautious if you have severe
high or low blood pressure, heart failure, or unstable angina.
If you take Viagra and develop cardiac symptoms (for example,
dizziness, nausea, and chest pain) during sexual activity, do
not continue. Alert your doctor to the problem as soon as possible.
If you have a condition that might result in long-lasting erections,
such as sickle cell anemia, multiple myeloma (a disease of the
bone marrow), or leukemia, use Viagra with caution. Also use cautiously
if you have a genital problem or deformity such as Peyronie's
disease. If an erection lasts more than 4 hours, seek treatment
immediately. Permanent damage and impotence could result.
If you have a bleeding disorder, a stomach ulcer, or the inherited
eye condition known as retinitis pigmentosa, use Viagra with caution.
Its safety under these circumstances has not yet been studied.
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