Precautions
Before using Viagra, tell your doctor your medical history, including any allergies (especially drug allergies), any penis conditions such as fibrosis/scarring, history of painful/prolonged erection (priapism), sickle cell anemia, blood system cancers (such as leukemia or myeloma), or Peyronie's disease, eye problems (retina diseases). kidney or liver disease, bleeding disorders or active stomach ulcers, heart diseases, stroke or severe high or low blood pressure. Limit alcohol intake, as it may aggravate side effects of Viagra. To avoid dizziness and lightheadedness when rising from a seated or lying position, get up slowly. The elderly may be more sensitive to the side effects of this drug, therefore caution is advised in this group.

Drug interactions
Tell your doctor of all nonprescription and prescription medication you may use, especially any nitrate medications (e.g., nitroglycerin, isosorbide dinitrate), nitroprusside (any "nitric oxide donor" medicines), cimetidine, erythromycin, azole antifungals (e.g., itraconazole, ketoconazole), mibefradil, rifamycins (e.g., rifampin) or high blood pressure medicines.

Notes
Do not share Viagra with others, since they may have a problem that is not effectively treated by this drug. Use of this drug does not protect against sexually transmitted diseases (e.g., HIV, Hepatitis B, gonorrhea).

Miss dose
Not applicable.

Storage
Store at room temperature between 59 and 86 degrees F (15-30 degrees C) away from light and moisture. Keep this and all medications out of the reach of children.

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