Viagra

Viagra is a prescription medication used to treat erectile dysfunction (ED).

Viagra is in a class of medications called PDE inhibitors. It increases blood flow to the penis during sexual stimulation. This increased blood flow can cause an erection.

This medication comes in tablet form and is taken one hour before sexual activity if treating for ED.

Common side effects include headache, facial flushing, and upset stomach.

Viagra is a prescription medication used to treat erectile dysfunction (ED) in adult males.

This medication may be prescribed for other uses. Ask your doctor or pharmacist for more information.

• Pfizer Laboratories

The most common side effects of Viagra are:

• headache
• flushing of the face
• upset stomach

Less common side effects that may occur are temporary changes in color vision (such as trouble telling the difference between blue and green objects or having a blue color tinge to them), eyes being more sensitive to light, or blurred vision.

In rare instances, men taking PDE5 inhibitors reported a sudden decrease or loss of vision in one or both eyes. It is not possible to determine whether these events are related directly to these medicines, to other factors such as high blood pressure or diabetes, or to a combination of these. If you experience sudden decrease or loss of vision, stop taking PDE5 inhibitors, including Viagra, and call a doctor right away.

In rare instances, men have reported an erection that lasts many hours. You should call a doctor immediately if you ever have an erection that lasts more than 4 hours. If not treated right away, permanent damage to your penis could occur.

Sudden loss or decrease in hearing, sometimes with ringing in the ears and dizziness, has been rarely reported in people taking PDE5 inhibitors, including Viagra. It is not possible to determine whether these events are related directly to the PDE5 inhibitors, to other diseases or medications, to other factors, or to a combination of factors. If you experience these symptoms, stop taking Viagra and contact a doctor right away.

Heart attack, stroke, irregular heart beats, and death have been reported rarely in men taking Viagra. Most, but not all, of these men had heart problems before taking this medicine. It is not possible to determine whether these events were directly related to Viagra.

Viagra may cause other side effects besides those listed. If you want more information or develop any side effects or symptoms you are concerned about, talk to your doctor or pharmacist.

Tell your doctor about all the medicines you take including prescription and non-prescription medicines, vitamins, and herbal supplements. Especially tell your doctor if you take any of the following:

• medicines called alpha blockers. These include Hytrin (terazosin HCl), Flomax (tamsulosin HCl), Cardura (doxazosin mesylate), Minipress (prazosin HCl) or Uroxatral (alfuzosin HCl). Alpha blockers are sometimes prescribed for prostate problems or high blood pressure. If Viagra is taken with certain alpha blockers, your blood pressure could suddenly drop and you could get dizzy or faint.
• other medicines to treat high blood pressure (hypertension)
• medications that block a protein in the body (CYPA4) such as some macrolide antibiotics (clarithromycin, telithromycin), some HIV protease inhibitors (indinavir, nelfinavir, ritonavir, saquinavir), some HCV protease inhibitors (boceprevir, telaprevir), some azole antifungals (ketoconazole, itraconazole, posaconazole, voriconazole), conivaptan (Vaprisol), delavirdine (Rescriptor), and nefazodone (Serzone)
• medications that increase the activity of the enzyme CYP3A4 such as carbamazepine (Tegretol, Equetro, Carbatrol), phenobarbital, phenytoin (Dilantin), rifampin (Rifadin), St John's wort, and nimodipine (Nimotop)
• other medicines or treatments for ED

Do not take Viagra if you take any medicines called “nitrates.” Nitrates are commonly used to treat angina. Angina is a symptom of heart disease and can cause pain in your chest, jaw, or down your arm.

• Medicines called nitrates include nitroglycerin that is found in tablets, sprays, ointments, pastes, or patches. Nitrates can also be found in other medicines such as isosorbide dinitrate or isosorbide mononitrate. Some recreational drugs called “poppers” also contain nitrates, such as amyl nitrite and butyl nitrite.
• Ask your healthcare provider or pharmacist if you are not sure if any of your medicines are nitrates.

This is not a complete list of Viagra drug interactions. Ask your doctor or pharmacist for more information.

• Viagra is not for newborns, children, or women.
• Do not let anyone else take your Viagra.
• Viagra must be used only under a doctor's supervision.
• There is potential risk of sexual activity in patients with cardiovascular risk factors. If you experience symptoms (chest pain, dizziness, nausea) upon initiation of sexual activity, it is advised to refrain from further sexual activity and discuss the episode with your doctor.

Grapefruit and grapefruit juice may interact with Viagra and lead to potentially dangerous effects. Discuss the use of grapefruit products with your doctor.

Be sure to tell your doctor if you:

• have ever had any heart problems (e.g., angina, chest pain, heart failure, irregular heart beats, heart attack or narrowing of the aortic valve)
• have ever had a stroke
• have low or high blood pressure
• have ever had severe vision loss
• have a rare inherited eye disease called retinitis pigmentosa
• have ever had any kidney problems
• have ever had any liver problems
• have ever had any blood problems, including sickle cell anemia or leukemia
• are allergic to Viagra or any of the other ingredients of Viagra
• have a deformed penis, Peyronie's disease, or ever had an erection that lasted more than 4 hours
• have stomach ulcers or any types of bleeding problems
• are taking any other medicines
• have sickle cell disease; Viagra may cause serious complications if PAH is secondary to sickle cell disease

Tell your doctor if you are pregnant or plan to become pregnant.

The FDA categorizes medications based on safety for use during pregnancy. Five categories - A, B, C, D, and X, are used to classify the possible risks to an unborn baby when a medication is taken during pregnancy.

This medication falls into category B.

Viagra is not indicated for use in newborns, children, or women.

It is not known if Viagra or its metabolites are excreted in human breast milk. Because many drugs pass into human milk, caution should be used when Viagra is administered to a nursing woman.

This medication comes in tablet form and is taken one hour before sexual activity if treating for ED.

For the treatment of ED:

For most patients, the recommended dose is 50 mg taken, as needed, approximately 1 hour before sexual activity. However, Viagra may be taken anywhere from 4 hours to 0.5 hour before sexual activity. Your doctor may increase the dose to a maximum recommended dose of 100 mg or decreased it to 25 mg. Viagra is to be taken only once per day.

If you take too much this medication, call your healthcare provider or local Poison Control Center, or seek emergency medical attention right away.

• Keep Viagra out of the reach of children.
• Keep Viagra in its original container.
• Store at room temperature away from excessive heat or moisture.