Viagra

Viagra - Achieve an erection

Viagra is a well-known drug that contains the active substance called sildenafil. It was invented by the scientists from the American pharmaceutical company Pfizer while searching a medicine for heart disease. This drug belongs to the group of phosphodiesterase type 5 inhibitors. It works by expanding the blood vessels in the penis and improves blood flow to the penis when you get sexually excited.

Viagra is used to treat erectile dysfunction (impotence) in men and should never be administered in women.

Precautions

Viagra should not be taken in patients with heart disorders because it can lead to a lowering of blood pressure and the occurrence of complications in these patients.

Viagra should never be taken simultaneously with medicines called nitric oxide donors (such as nitroglycerin). These drugs lower blood pressure and are used in the treatment of angina pectoris. Co-administration may lead to the occurrence of serious cardiac complications.

Viagra should not be used in the following situations:

  • If you have severe liver impairment
  • If you have had a heart attack or stroke
  • If you have a rare inherited eye disease called retinitis pigmentosa
  • If you have cancer
  • If you have a stickle cell anemia
  • If you have hemophilia
  • If you have stomach ulcers
  • If you have penile deformity

It should not be used in patients under the age of 18.

How should you take Viagra

Take one tablet (50-100 mg) one hour before sexual activity. If after taking Viagra tablets you eat your meal, then it may take longer for Viagra to have therapeutic effect.

This medicine will help you get an erection only if you are sexually stimulated.

If you take more than 100 mg it will not increase the effect of this drug on the erection but it will increase the risk of side effects.

Interactions

Drugs that increase the concentration of Viagra in the blood and its side effects include:

  • Clarithromycin, erythromycin and telithromycin (antibiotics)
  • Amprenavir and atazanavir (medicines used to treat AIDS)
  • Boceprevir (drug used to treat hepatitis C)

Drugs that increase the risk of low blood pressure when used simultaneously with Viagra include:

  • Riociguat (a drug used to treat pulmonary hypertension)
  • Isosorbide dinitrate, nitroglycerin and other nitrates

Viagra side effects

Very common side effect of Viagra is headache. It is caused by dilation of blood vessels in the head. It lasts a few hours.

Other Viagra adverse effects include:

  • Increased sensitivity to light
  • Hot flushes
  • Redness
  • Dizziness
  • Blurred vision
  • Bloodshot eyes
  • Double vision
  • Abnormal sensation in the eye
  • Rapid heartbeat
  • Low blood pressure
  • Ringing in the ears
  • Stroke
  • Nosebleeds
  • Hearing loss
  • Heart attack
  • Dry mouth
  • Allergy
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