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Viagra

Viagra is a brand for sildenafil, a prescription drug used to treat erectile dysfunction (ED).
Sildenafil belongs to a class of drugs called phosphodiesterase inhibitors that work by increasing blood flow to the penis during sexual activity, leading to an erection.
However, Viagra will not work without sexual stimulation.
Manufactured by Pfizer Pharmaceuticals, Viagra was originally conceived as a treatment for hypertension and cardiovascular disease, until the researchers discovered that it had produced an erection.
In 1998, the Food and Drug Administration (FDA) approved it as the first tablet for the treatment of impotence (now known as erectile dysfunction), and in 2005 it approved sildenafil for the treatment of PAH.
Viagra was prescribed “without label” for the treatment of Raynaud’s disease, in which the fingers and toes become cold and numb, and in combination with doxorubicin for the treatment of prostate cancer.
Sildenafil under the Revatio brand name is also prescribed to men and women with pulmonary arterial hypertension (PAH) to improve their ability to exercise and reduce shortness of breath.

Viagra Warnings

Do not take Viagra if you are taking nitrate medicines for chest pain or heart problems. This mix can cause a sudden and severe drop in blood pressure, causing you to feel dizzy and weak and possibly cause a heart attack or stroke.
(Keep in mind that some recreational drugs, such as amyl nitrate or “poppers”, also contain nitrate).
Alpha blockers, such as Hytrin (terazosin) and Flomax (tamsulosin HCI) in combination with Viagra can also lead to lower blood pressure.
Make sure that you are healthy enough to have sex before taking Viagra – talk to your doctor about any heart problems or heart rhythm problems, as sex exerts additional stress on the heart.

Viagra for Women

The FDA did not approve of Viagra as a treatment for sexual dysfunction in women, although a growing number of studies have shown that in some women libido and sexual arousal can increase.

Pregnancy and Viagra

While the FDA has not approved Viagra for sexual dysfunction or low libido in women, women taking Revatio, which has the same active ingredient as Viagra, for LAS, should inform their doctor if they are pregnant or plan to become pregnant.
Viagra is in the B category of FDA pregnancy, which means that no fetal harm is expected, but adequate studies have not been conducted in pregnant women to prove this.
It is not known whether sildenafil is excreted in breast milk. Ask your doctor if it is safe to breast-feed while taking Viagra.

Viagra side effects

Common side effects of Viagra

  • Headache
  • Washing face, neck or chest
  • Upset stomach, upset stomach
  • Abnormal vision
  • Nasal congestion
  • Backache
  • Muscle pain or tenderness
  • Nausea
  • Dizziness
  • rash
  • diarrhea

Serious side effects of Viagra

  • Change or loss of vision
  • Ringing in the ears or hearing loss
  • Chest pain or irregular heartbeat
  • Inconsistent Breath
  • Dizziness
  • Swelling in the hands, ankles and legs

Stop taking Viagra and consult a doctor immediately if you experience any of these serious side effects.
Hives, shortness of breath, swelling of the face, lips, tongue or throat are signs of an allergic reaction. Seek immediate medical attention.
If your erection is painful or lasts more than four hours (priapism), immediately consult a doctor, as this can lead to permanent tissue damage and impotence.

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Interactions of Viagra with other drugs

Always let your doctor know about all other drugs you take, whether they are prescription, over-the-counter or recreational, including herbal remedies and food supplements or food supplements, since they can interact with Viagra.
If you take a nitrate drug such as nitroglycerin (nitrostat) or isosorbide dinitrate (Dilatrate-SR) for chest pain or heart problems, do not take Viagra, since the interaction with sildenafil can cause a sudden and dangerous drop in blood pressure.
Keep in mind that some recreational drugs, such as amyl nitrate or nitrite (“poppers”), contain nitrates. Blood pressure may drop when Viagra is taken with alpha-blockers.
Do not take Viagra if you are taking other drugs for erectile dysfunction, such as Stendra, Cialis or Levitra.
The use of these drugs with sildenafil is not recommended:

  • Cimetidine (Tagamet)
  • Boscentan (Tracleer)
  • Imatinib (Gleevets)
  • Nefazodone (Serzone)
  • St. John’s Wort
  • Antibiotics: such as clarithromycin (bixin), erythromycin (EryPed 200, EryPed 400)
  • Antifungal drugs: fluconazole (Diflucan), itraconazole (Sporanox)
  • Preparations of the heart or blood pressure: amlodipine (norvask), amiodarone (Cordarone, Nexterone, Pacerone)
  • Medicines against hepatitis C: boceprevir (Victrelis)
  • Treatment of HIV / AIDS: ritonavir (norvir), amprenavir (agenaraz), atazanavir (Reietaz)
  • Exciting drugs: carbamazepine (Tegretol), phosphenytoin (Cerebyx)
  • Tuberculosis drugs: isoniazid

Viagra and grapefruit

Avoid the use of grapefruit and grapefruit juice while taking sildenafil.
Grapefruit products can prevent the destruction of sildenafil, as a result of which it is absorbed in large amounts, which can reach toxic levels.

Viagra and alcohol

Drink carefully while taking Viagra. Alcohol and Viagra share the major side effects – dizziness, headaches, stomach upset – and their union only strengthens these effects.
In addition, excessive consumption of alcohol can have a devastating effect on erection.

Viagra and Food

Viagra can be taken with or without food. When you take a high-fat diet, it will take longer to work.

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Dosage of Viagra

Available in the form of tablets, Viagra comes in a dose of 25 mg (mg), 50 mg and 100 mg.

  • For ED, the recommended dose is 50 mg one hour before sexual activity, but Viagra can be taken from 30 minutes to four hours. Viagra should not be taken more than once a day.
  • The dose can be adjusted to the maximum recommended dose of 100 mg or reduced to 25 mg.
  • People over 65 years of age, as well as people with impaired kidney or liver, should start with a dose of 25 mg.
  • For those taking ritonavir (Norvir) and other drugs for HIV treatment, the recommended dose is 25 mg before sexual activity, and the maximum dose is 25 mg within 48 hours.
  • Those who take CYP3A4 inhibitors, such as ketonconazole (Xolegel, Extina, Nizoral), itraconazole (Onmel, Sporanox) or erythromycin (Akne-mycin, Staticin) should begin at a dose of 25 mg.
  • For adults taking sildenafil (Revatio) for PAH, the recommended dose is 20 mg three times a day for four to six hours. The FDA did not approve Revatio for children under the age of 18.

Overdose of Viagra

If you or someone else take too much Viagra, call the poison control center  (or call 911 if the person has collapsed or is not breathing).
Symptoms of an overdose of Viagra include:

  • Inconsistent Breath
  • Chest pain or irregular heartbeat
  • Nausea
  • Dizziness or weakness
  • Hearing loss or vision loss

The missed dose of Viagra

Since Viagra is taken as needed, and not on schedule, you are unlikely to forget the dose.

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