SIDE EFFECTS
Headache, flushing, stomach upset, nasal stuffiness, diarrhea and dizziness might occur. If these effects persist or worsen, notify your doctor promptly. Unlikely but report promptly: painful or other urination problems, vision problems, skin rash. Very unlikely but report promptly: chest pain, fainting, foot or ankle swelling. If you experience a painful or prolonged erection (lasting longer than 4 hours), stop using this drug and seek immediate medical attention. If you notice other effects not listed above, contact your doctor or pharmacist.

PRECAUTIONS
Before using this drug, tell your doctor your medical history, including: allergies (especially drug allergies), penis conditions such as fibrosis/scarring (e.g., Peyronie's disease), history of painful/prolonged erection (priapism), sickle cell anemia, blood system cancers (such as leukemia or myeloma), eye problems (retina diseases), kidney or liver disease, bleeding disorders, active stomach ulcers, heart disease, stroke, very high or low blood pressure. Limit alcohol intake, as it may aggravate side effects of this drug. Since this drug may cause dizziness, caution is advised when performing tasks requiring alertness (e.g., driving). To avoid dizziness and light-headedness when rising from a seated or lying position, get up slowly. This drug is not to be used in women or children. 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 non-prescription and prescription medication you may use, especially of: 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), high blood pressure medicines, certain HIV protease inhibitors (such as Saquinavir, Ritonavir, Amprenavir), Delavirdine. Do not start or stop any medicine without doctor or pharmacist approval. 

OVERDOSE
If overdose is suspected, contact your local poison control center or emergency room immediately. Symptoms of overdose may include severe dizziness, fainting, or prolonged erection.

NOTES
Do not share this medication 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, Syphilis).

MISSED 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.

IMPORTANT NOTE
The above information is intended to supplement, not substitute for, the expertise and judgement of your physician, pharmacist or other healthcare professional. It should not be construed that the taking of this medication is safe, appropriate or effective for you.

* Illustrations are for graphic purposes only and the ordered medication may differ in appearance.