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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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Side Effects of This Medicine
Side effects cannot be anticipated. If any develop or change in intensity, inform your doctor as soon as possible. Only your doctor can determine if it is safe for you to continue taking Viagra.
More common side effects may include:
Abnormal vision (color tinge, blurring, sensitivity to light), acid indigestion, diarrhea, flushing, headache, nasal congestion, urinary tract infection
Heart attack, stroke, heart irregularities, dangerous surges in blood pressure, and sudden death have all been reported after use of Viagra, usually in men with existing cardiac risk factors
, and typically during or shortly after sex.
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Significant Interactions:
When you are taking Viagra, it is especially important that your health care professional know if you are taking any of the following:
- Cimetidine (e.g., Tagamet)
- Erythromycin (e.g.,
E.E.S. or Ery-Tab)
- Itraconazole (e.g., Sporanox)
- Ketaconazole (e.g., Nizoral)
- Mibefradil (e.g., Posicor)
- Ritonavir (e.g., Norvir)
- Saquinavir (e.g., Fortovase or Inv
irase)¡XThese medicines may increase the unwanted effects of Viagra, unless lower starting doses of Viagra are used
- Nitrates, such as nitroglycerin (e.g., Nitrostat or Transderm-Nitro)¡XViagra
creases the lowering of blood pressure by nitrates too much and their use together is not recommended
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What special precautions should I follow?
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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Precautions 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
- 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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Special warnings about this medication
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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