Viagra details
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Viagra (generic name sildenafil) slows down the action of enzymes called phosphodiesterases (PDEs).
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What is Viagra?

Viagra (generic name sildenafil) slows down the action of enzymes called phosphodiesterases (PDEs). This allows arteries to dilate and so increases the flow of blood. Viagra is aimed at PDE5 which is found inside the muscle walls of the arteries in your penis. Because more blood flows inside, you get a harder, longer-lasting erection. When you have finished intercourse, your erection goes away until you are ready to go again.

PDE5 is also found in your chest and lungs. Viagra is therefore also used to treat pulmonary arterial hypertension. By allowing the arteries from the right side of your heart to dilate, your blood pressure is reduced and your heart can beat with less effort.

Before using Viagra

Although Viagra can be taken safely by most men, there are always safety concerns which should be discussed with a doctor or pharmacist. There will be serious issues to review if you have:

  • high or low blood pressure, any cardiovascular disease, or you have had a stroke or heart attack within the last six months;
  • any disease or condition that thickens your blood, slows its flow or affects its ability to clot;
  • high cholesterol or lipid levels, or you have been diagnosed as diabetic;
  • serious kidney or liver disease;
  • any serious eye condition — the risk of side effects affecting your vision is increased if you also smoke; or
  • any pain when erect, you have had an unnaturally long erection or your penis has changed shape.

Age—Any man over the age of 50 years who is about to resume sexual activity should have a physical examination. If you are aged 65 years over over, you should only take a reduced dose to minimise the risk of side effects.

Allergies—If you have ever had an adverse reaction to Viagra or to any food, preservative or dye, you should have allergy tests before using Viagra regularly.

Pregnancy—Viagra is designed for men. Although there is no evidence of birth defects if Viagra is taken during pregnancy, there may be risks to a male baby either in the womb or when breast-feeding.

Other medicines—There is always a risk when you take more than one medication at the same time. Always ask your doctor for advice if you are already taking:

  • alpha-blockers
  • Bosentan
  • Cimetidine
  • Erythromycin
  • Itraconazole
  • Ketaconazole
  • Mibefradil
  • Ritonavir
  • Saquinavir

PDE5 is also found in your chest and lungs. Viagra is therefore also used to treat pulmonary arterial hypertension. By allowing the arteries from the right side of your heart to dilate, your blood pressure is reduced and your heart can beat with less effort.

Taking Viagra

Dosage—The standard starting dose for adult men under the age of 65 years is 50mg. If you are over 65 years, you should start with 25mg. Do not take more than one tablet per day.

Viagra begins to work about thirty minutes after you have taken it and its effects last for up to four hours, although you will be at your best about two hours after taking it.

Storage—Always store this medication in a cool dry place out of the reach of children. Always make sure that you dispose of unwanted or out-of-date Viagra safely.

What are the side effects of Viagra

More common and mild side effects

  • headache;
  • nose bleed;
  • flushing or blushing to the face or neck, or unusually warm skin;
  • muscular aches and pains;
  • stomach discomfort following meals or diarrhoea; 
  • sneezing, or a stuffed-up or runny nose;
  • insomnia.

Less common and justifying seeking medical attention:

  • dizziness;
  • difficult or laboured breathing;
  • any change to your ability to distinguish between blue and green, or any sudden decrease in, or loss of, vision;
  • increased  indigestion, upset stomach or tenderness in stomach;
  • bladder pain, urinating more frequently, or cloudiness or blood in your urine;
  • itching, numbness, prickling, a rash, hives or any other symptom suggesting an allergic reaction.