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What Is It
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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Possible Side Effect
Less common to rare side effects may include:
- insomnia, itchy skin, joint disease, light sensitivity, loss of bladder control (urinary incontinence), low blood pressure, migraine headache, mus
cle ache, nosebleeds, numbness, oral inflammation, pain, painful erection, prolonged erection, raised skin patches, rapid or throbbing heartbeat, rectal bleeding, respiratory inflammation, ringing in
the ears, seizure, sinus and throat inflammation, skin rash, skin ulcer, slow reflexes, stomach or intestinal inflammation, sweating, swelling, thirst, tremor, vision problems, vomiting, weakness
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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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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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Possible food and drug interactions when taking this medication
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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Precautions Before Using 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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