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Possible food and drug interactions when taking this medication
If Viagra is taken with certain other drugs, the effects of either could be increased, decreased, or altered. It is especially important to check with your doctor before combining Viagra with the foll
owing:
- Other impotence remedies including Caverject and Muse
- Alpha-blockers such as doxazosin (Cardura)
- Amlodipine (Norvasc)
- Cimetidine (Tagamet)
- Erythromycin (
E-Mycin, Ery-Tab, PCE)
- Itraconazole (Sporanox)
- Ketoconazole (Nizoral)
- Nitrates such as Isordil, Nitro-Bid, and Nitro-Dur
- Rifampin (Rifadin, Rimactane)
- Ritonavir (Nor
vir)
- Saquinavir (Fortovase, Invirase)
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How should this medicine be used?
Viagra comes as a tablet to take by mouth. It should be taken as needed about 1 hour before sexual activity. However, Viagra can be taken anytime from 4 hours to 30 minutes before sexual activity. Via
gra should not be taken more than once a day. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take Viagra exact
ly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.
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Cautions
Use Viagra exactly as directed by your doctor. Do not use more of it and do not use it more often than your doctor ordered. If too much is used, the chance of side effects is increased.
-
If
you experience a prolonged or painful erection for 4 hours or more, contact your doctor immediately. This condition may require prompt medical treatment to prevent tissue damage of the penis and possi
ble permanent impotence.
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Why is this drug prescribed?
Viagra (sil-DEN-a-fil) belongs to a group of medicines that delay the enzymes called phosphodiesterases from working too quickly. The penis is one of the areas where these enzymes work. Viagra is used
to treat men who have erectile dysfunction (also called sexual impotence).
By controlling the enzyme phosphodiesterase, Viagra helps to maintain an erection that is produced when the penis i
s stroked. Without physical action to the penis, such as that occurring during sexual intercourse, Viagra will not work to cause an erection
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What special precautions should I follow?
The presence of other medical problems may affect the use of Viagra. Make sure you tell your doctor if you have any other medical problems, especially:
- Arrhythmias (irregular heartbeat) or
- Conditions causing thickened blood or slower blood flow, including leukemia; multiple myeloma (tumors of the bone marrow); or polycythemia, sickle cell disease, and thrombocythemia (blood problems)
or
- Priapism (history of)¡XAlthough Viagra does not cause priapism (erection lasting longer than 6 hours), patients with these conditions have an increased risk of priapism and it could occur w
ile using Viagra
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Overdosage
No overdose of Viagra has been reported. However, any medication taken in excess can have serious consequences. If you suspect an overdose, seek medical attention immediately.
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