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What is Viagra?

Viagra is the world's first ED therapeutic drug commercialized by Pfizer Inc., which has its headquarters in the United States, as an effective drug for ED (erectile dysfunction). The active ingredient is “sildenafil” and the formulation name is “sildenafil citric acid”. "Salt tablets" and the brand name "Viagra" are registered trademarks of Pfizer. The international birth was in February 1998 in the United States. The dosage form is a diamond-shaped, blue film-coated tablet as shown in the image. When the drug is broken, the content is white.

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How to take and precautions

Only the main points of taking it are summarized below. The main point is to drink on an empty stomach.

  • Take with water 1 hour before sexual activity. If there is no water, there is no problem with soft drinks and tea. *However, do not drink beverages that contain fat, such as milk. It may interfere with the absorption of the drug.
  • It is dangerous to take grapefruit juice because the medicine may be too effective or unexpected side effects may occur. Also, please note that even if you chew it, it does not work quickly and it is only bitter.
  • The action time is about 4 to 5 hours after taking it.
  • Take once a day, and take at least 24 hours apart.
  • It is not a drug that produces an effect and erects without permission, but it does not erect unless there is sexual desire and sexual stimulation. Emergency medicine to assist it in when the erection Please think.
  • There is no sexual arousal effect or sexual desire promotion effect, so drinking it will not cause an erection. Viagra helps with sexual stimulation when it erects.
  • If you take it after meals, the effect will be considerably lower than when you eat it (when you are hungry). If you are hungry, it will take effect in about 30 minutes. For details , please refer to " Effects of meals " at the bottom of the page .
  • Moderate drinking can be effective, but overdrinking may not work at all. For more information , please see " About using with alcohol " at the bottom of the page .

About side effects | Do you strain your heart?

Those who take Viagra tend to have side effects such as "hot flashes on the face" and "red blood in the eyes" as soon as the effects begin to appear . It will be easier to understand if you can imagine when drinking. It is a symptom that occurs in about 50% of people, so it is fine if you can capture it as a signal that Viagra has started to work. Other symptoms such as headache, palpitation, and stuffy nose may occur, but they are temporary.

On the other hand, although there are few cases, it cannot be said that there are no serious side effects. If any symptoms other than the above appear, stop using Viagra immediately and consult a doctor.

Effect, efficacy, mechanism of action.

Viagra is a drug that is effective and effective in treating ED (erectile dysfunction). The mechanism (mechanism of action) is as follows.

First, let me explain the mechanism of erection in the male genitals. When some sexual stimulation is given to a man, the central nerves of the brain are excited and transmitted to the penis through the spinal nerves. At this time, nitric oxide is secreted in the body and a substance called cyclic GMP (cyclic guanosine monophosphate) that expands blood vessels in local cells increases, and as a result, the smooth muscle of the cavernous body relaxes. When this happens, more blood will flow into the corpus cavernosum than normal, causing an erection in the male genitals. It should be noted that, for the mechanism of erection, we introduce in more detail here please take a look since.

However, it is inconvenient if the penis is always erected, so there is an enzyme (5-phosphodiesterase: PDE-5) in the human body that suppresses erection. This enzyme has the function of degrading cyclic GMP. It is the action of this enzyme that causes the erection to converge when sexual arousal subsides.

If this enzyme remains dominant during sexual activity, you will end up with ED (erectile dysfunction). The component contained in Viagra promotes erection by inhibiting the action of this enzyme called PDE-5 . There are three main causes of ED: organic, psychogenic, and drug-induced. Please refer to the links for detailed explanations of each.

What is the recommended dose of Viagra?

In general, for adults, take 1 tablet (25 mg to 50 mg) once a day with about 1 cup of water or lukewarm water about 1 hour before sexual activity. It may take some time for the effects to appear after drinking, so please take before meals. There is individual difference in the dose required for each dose, so be sure to consult a doctor.