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Possible Side Effect
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
- Abnormal visio
n, including blurred vision, seeing shades of colors differently than before, or sensitivity to light; bladder pain; cloudy or bloody urine; dizziness; increased frequency of urination ; pain on
urination
- Bleeding of the eye; convulsions (seizures) ; decreased vision or other changes in vision; double vision; prolonged, painful, or inappropriate erection of penis; redness, b
urning, or swelling of the eye; vision loss, temporary
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Other Medicines
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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Before Using This Medicine
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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What is this medicine
Viagra is the first oral drug for male impotence. It works by dilating blood vessels in the penis, allowing the inflow of blood needed for an erection.
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What special precautions should I follow?
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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What special precautions should I follow?
Before taking Viagra,
tell your doctor and pharmacist what prescription and nonprescription medications you are taking, especially amlodipine (Norvasc) or other medications for high blood pre
ssure, cimetidine (Tagamet, Tagamet HB), erythromycin, HIV protease inhibitors such as ritonavir (Norvir) and saquinavir (Invirase), isosorbide (Imdur, Ismo, Isordil, and others), itraconazole (Sporan
ox), ketoconazole (Nizoral), nitroglycerin (Nitro-Bid, Nitrostat, and others), other medications to treat impotence, phenobarbital, rifampin (Rifadin, Rimactane),and vitamins.
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