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Directions
Viagra is generally taken approximately one hour prior to sexual activity.
Patient information
Viagra should not be taken more than once daily or if you use any medications containing nitrates. The use of this medication does not protect against sexually transmitted diseases. Patients are advised that the medication has no effect without sexual stimulation. Side effects include upset stomach, headache, flushing, abnormal vision, diarrhea, dizziness, and rash.
Precautions
It is important that your doctor has your complete medical history. Consult with your doctor if you have a cardiovascular condition, such as high blood pressure, kidney impairment, liver impairment, sickle cell anemia, multiple myeloma, leukemia, and anatomical deformations of the penis, bleeding disorders, or retinitis pigmentosa.
Drug interactions
Tell your doctor of all prescription and nonprescription medication you may
be using, especially any nitrate medications (e.g., nitroglycerin, isosorbide dinitrate), nitroprusside (any "nitric oxide donor" medicines), quinidine, quinine, verapamil, cimetidine, erythromycin, clarithromycin, azole antifungals (e.g., itraconazole, ketoconazole, fluconazole), mibefradil, niacin, omeprazole, rifamycins (e.g., rifampin) medication for HIV infection or high blood pressure medicines.
Side
Effects
Side effects associated with Viagra include headache, flushing, upset stomach, abnormal vision, diarrhea, dizziness, and rash.
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