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Overdose
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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How to Use
Doses range from 25 milligrams to 100 milligrams, depending on the drug's effect. The usual dose is 50 milligrams. If you are over 65, have liver or kidney problems, or are taking erythromycin, ketoco
nazole, itraconazole, ritonavir, or saquinavir a dose of 25 milligrams may be sufficient. Your doctor will adjust the dosage if the drug is not working properly for you.
Take Viagra only bef
ore sexual activity. The manufacturer recommends a maximum of 1 dose per day (1 dose every 2 days for those taking ritonavir).
To avoid low blood pressure, do not take the 50-milligram or 10
0-milligram dose of Viagra within 4 hours of taking an alpha-blocking drug such as Cardura.
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Before Taking 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
- Coronary artery disease or
- Heart attack, history of (within the last 6 months) or
- High blood pressure or
- Low blood pressure or
- Stroke, history of (within the last 6 mont
hs)¡XChance of problems occurring may be increased
- Abnormal penis, including curved penis and birth defects of the penis¡XChance of problems occurring may be increased
- Bleeding problems
- Retinitis pigmentosa¡XChance of problems occurring may be increased. It is not known if the medicine is safe for use in these patients
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Before Taking This Medicine
Allergies¡XTell your doctor if you have ever had any unusual or allergic reaction to Viagra. Also tell your health care professional if you are allergic to any other substances, such as foods, preserv
tives, or dyes.
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Cautions
Viagra has not been studied with other medicines used for treatment of erectile dysfunction. Presently, using them together is not recommended .
-
- Use Viagra exactly as directed by your doc
tor. 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 erec
tion for 4 hours or more, contact your doctor immediately. This condition may require prompt medical treatment to prevent tissue damage of the penis and possible permanent impotence.
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Possible food and drug interactions
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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