Sildenafil, better known as Viagra or the blue pill , is a drug used in men to treat the inability to maintain a firm erection of the penis and long enough during sexual intercourse, this is known as erectile dysfunction.

It is also used to treat pulmonary hypertension and has been used to treat high-altitude pulmonary edema which is frequently caused when an individual is exposed to prolonged high altitudes, it is normally used in mountaineers when their descent is delayed for some reason.

In the following article you will learn a little more about the uses, doses, effects, precautions and cons of the consumption of this drug, so I invite you to continue with us.

Uses of Sildenafil

It is used to treat sexual dysfunction in men when they do not have the ability to provide a firm and constant erection during sexual intercourse, since its main compound Sildenafil Citrate acts as a vasodilator producing a better blood flow towards the penis causing erection during sexual stimulation.

It is also used to treat pulmonary hypertension by reducing the effects of shortness of breath that produce symptoms of dizziness, exhaustion, weakness and tiredness. The action of the drug causes the arterial wall to relax, which eventually reduces the workload on the right ventricle of the heart, considerably reducing the chances of suffering a myocardial infarction or respiratory arrest.

For the pulmonary edema of altitude it is frequently prescribed when the descent of a mountaineer is prolonged, its effect has not yet been proven one hundred percent nor has this treatment been extensively studied, however, the times it has been applied have been cases with effective and positive results.

What you should know before taking Sildenafil

  • It is important before starting to take any type of medicine to consult with your doctor and that he / she performs a check-up and indicates the best way to start giving it.
  • Erectile dysfunction problems are often associated with other pathologies or depressive attacks, so it is advisable to turn to a specialist and find a way to correct the factor that affects the body in order to guarantee a better quality of life.
  • If you have consumed any type of drug that contains nitrates, you must not consume this medicine in any way.
  • Make sure to tell your doctor about all the medications you are taking or that you plan to start taking and that they are sold with or without a prescription, including vitamins and nutritional supplements, make a list and do not go unnoticed.
  • If you consume herbal products inform your doctor as well.
  • If you are prescribed treatment for pulmonary hypertension (female) and you are pregnant or breast-feeding, inform your doctor.


  • If you plan to drive for a long time after consuming a dose, avoid doing so as it can lead to drowsiness and lethargy.
  • Foods that contain high fat content can suppress the absorption of the drug.
  • If you are young, avoid non-prescribed consumption without first consulting your doctor.
  • Do not drink large amounts of alcohol if you are consuming the medicine as it can cut the effect of the medicine and even put your health at risk.
  • If you are a woman, do not take the product unless it is to treat pulmonary hypertension problems previously prescribed by a specialist doctor.
  • Many people including women associate the product with a powerful aphrodisiac that stimulates sexual pleasures, it should be noted that its use is only to treat pulmonary hypertension and erectile dysfunction of the penis.

Recommended dosage

To treat erectile dysfunction:

  • The most recommended is to take a dose of 100 mg per day and approximately 30 minutes before having a sexual intercourse, if the presentation that you have at your disposal is 50 mg, you can take two pills. It is not advisable to take more than 100 mg a day.
  • There is a chewable presentation whose absorption is much faster than the previous one, so it can be taken 15 minutes before having sexual intercourse.

To treat pulmonary hypertension:

  • The recommended dose is 20 mg every 8 hours (3 times a day).

Side effects

As usual, almost all medications can have side effects on the body since they are substances foreign to the body, not all people experience the same symptoms or reaction in the same way, here we will leave you a list with the most common symptoms.

  • Headache.
  • Nasal bleeding.
  • Redness of the skin.
  • Rashes.
  • Heartburn.
  • Diarrhea.
  • Dyspepsia.
  • Embarrassment.
  • Blurry vision.
  • Photophobia (intolerance to light).
  • Dizziness
  • Numbness of the limbs.
  • Accelerated palpitations
  • Indigestion.
  • Pain in the lower area from a prolonged erection.
  • If its use is frequent, it is likely to present muscle pain.
  • Some users report the presence of a blue tone in their vision, a disorder known as “Cyanopsia”.
  • Loss of peripheral vision.

Other more severe but less frequent effects:

  • Hypotension
  • Priapism.
  • Ventricular arrhythmia.
  • Loss of audio.
  • Myocardial infarction.
  • Cerebral stroke.
  • Increased eye pressure.


Like many medications, its use must always be carried out under medical supervision and indications, since certain pathologies restrict its use and the combined use with certain medications can put the individual’s health at risk. Their sale is usually carried out in a prescribed manner.

Contraindications apply for the following cases:

  • If you suffer from kidney disease or liver failure.
  • Degenerative eye diseases.
  • Arterial hypotension
  • High blood pressure.
  • Cardiovascular risks.
  • If you have recently suffered from myocardial infarction.
  • If you are consuming any medicine or substance whose composition contains nitrites and nitric oxides, amyl nitrate, organic nitrates, nitroglycerin, sodium nitroferricyanide.
  • If you are consuming any retroviral treatment as it may decrease the effect of it.

Presentations available in the market

  • Of 25 mg 4 pills.
  • Of 25 mg 8 pills.
  • Of 50 mg 4 pills.
  • Of 50 mg 8 pills.
  • Of 50 mg 12 pills.
  • Of 50 mg 24 pills.
  • Of 50 mg 32 pills.
  • Of 50 mg 36 pills.
  • Of 50 mg 64 pills.
  • Of 100 mg 8 pills.
  • Of 100 mg 12 pills.
  • 100 mg 16 pills.
  • Of 100 mg 24 pills.
  • Of 100 mg 32 pills.
  • Of 100 mg 36 pills.
  • Of 100 mg 64 pills.

How to store and dispose of the product

You should keep this medicine in the original container with which it comes from the factory, try to keep it closed and always out of the reach of children. Keep your medicine at a suitable temperature. You should never store your medicine in humid areas or in places that are exposed to the sun’s rays. You can even refrigerate it if you prefer, it should not be frozen either. If after 30 days you do not use an open product which has been exposed to the environment, discard it.

Remember the importance of keeping the products out of the reach of children, the pill presentations of this drug do not come in a bottle with a safety cap so that any child can easily access the drug.

To dispose of the product, do not throw this in the garbage in order to protect pets, children or any other person from accidentally consuming it, it is not advisable to throw it in the toilets, the best thing you can do is dispose of them through a return program medication or ask your local pharmacy for it.

A little history

It was initially created with the purpose of treating the problems caused by high blood pressure and the disease known as angina pectoris (pain and disease of the coronary arteries).

Its first clinical studies were carried out at the Morriston Hospital located in the United Kingdom under the supervision of the specialist Ian Osterloh, in this first phase the evidence of lifting or erections of the penis is observed in men who had been given a dose.

When they noticed the effects it produced on the penis, they dedicated their efforts and work to study it more, practically the drug was a coincidence and a discovery that would change the lives of many people.

In 1996, the Pfizer Laboratory patented its formula and it was released on the market for the first time in 1998 in the United States, achieving great popularity and being the best-selling pill in a short time. Only between 1999 and 2001 more than a billion dollars were registered in the sale of this product.

Samantha Robson
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Dr. Samantha Robson ( CRN: 0510146-5) is a nutritionist and website content reviewer related to her area of ​​expertise. With a postgraduate degree in Nutrition from The University of Arizona, she is a specialist in Sports Nutrition from Oxford University and is also a member of the International Society of Sports Nutrition.

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