Sildenafil Citrate (Generic Viagra) belongs to a group of medicines that delay the enzymes called phosphodiesterases from working too quickly. The penis is one of the areas where these enzymes work. Sildenafil Citrate is used to treat men who have erectile dysfunction (also called sexual impotence).

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GENERIC NAME: Sildenafil Citrate
BRAND NAME: Viagra

Why is Sildenafil Citrate prescribed?
Sildenafil Citrate (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. Sildenafil Citrate (Revatio) is used to improve the ability to exercise in people with pulmonary arterial hypertension (PAH; high blood pressure in the vessels carrying blood to the lungs, causing shortness of breath, dizziness, and tiredness). Sildenafil Citrate is in a class of medications called phosphodiesterase (PDE) inhibitors. Sildenafil Citrate treats erectile dysfunction by increasing blood flow to the penis during sexual stimulation. This increased blood flow can cause an erection. Sildenafil Citrate treats PAH by relaxing the blood vessels in the lungs to allow blood to flow easily.

If you are taking Sildenafil Citrate to treat erectile dysfunction, you should know that it does not cure erectile dysfunction or increase sexual desire. Sildenafil Citrate does not prevent pregnancy or the spread of sexually transmitted diseases such as human immunodeficiency virus (HIV).

How should Sildenafil Citrate be used?
Sildenafil Citrate comes as a tablet to take by mouth.

If you are taking Sildenafil Citrate to treat erectile dysfunction, follow your doctor's directions and the guidelines in this paragraph. Take Sildenafil Citrate as needed before sexual activity. The best time to take Sildenafil Citrate is about 1 hour before sexual activity, but you can take the medication any time from 4 hours to 30 minutes before sexual activity. Sildenafil Citrate usually should not be taken more than once every 24 hours. If you have certain health conditions or are taking certain medications, your doctor may tell you to take Sildenafil Citrate less often. You can take Sildenafil Citrate with or without food. However, if you take Sildenafil Citrate with a high-fat meal, it will take longer for the medication to start to work.

If you are taking Sildenafil Citrate to treat PAH, follow your doctor's directions and the guidelines in this paragraph. You will probably take Sildenafil Citrate three times a day with or without food. Take Sildenafil Citrate at around the same times every day, and space your doses about 4 to 6 hours apart.

Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take Sildenafil Citrate exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.

If you are taking Sildenafil Citrate for erectile dysfunction, your doctor will probably start you on an average dose of Sildenafil Citrate and increase or decrease your dose depending on your response to the medication. Tell your doctor if Sildenafil Citrate is not working well or if you are experiencing side effects.

If you are taking Sildenafil Citrate for PAH, you should know that Sildenafil Citrate controls PAH but does not cure it. Continue to take Sildenafil Citrate even if you feel well. Do not stop taking Sildenafil Citrate without talking to your doctor.

Ask your pharmacist or doctor for a copy of the manufacturer's information for the patient.

Other uses for Sildenafil Citrate
Sildenafil Citrate is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.

What special precautions should I follow?
Before taking Sildenafil Citrate,

tell your doctor and pharmacist if you are allergic to Sildenafil Citrate or any other medications.
do not take Sildenafil Citrate if you are taking or have recently taken nitrates (medications for chest pain) such as isosorbide dinitrate (Isordil), isosorbide mononitrate (Imdur, ISMO), and nitroglycerin (Nitro-BID, Nitro-Dur, Nitroquick, Nitrostat, others). Nitrates come as tablets, sublingual (under the tongue) tablets, sprays, patches, pastes, and ointments. Ask your doctor if you are not sure whether any of your medications contain nitrates.
do not take street drugs containing nitrates such as amyl nitrate and butyl nitrate ('poppers') while taking Sildenafil Citrate.
tell your doctor and pharmacist what prescription and nonprescription medications, vitamins, and nutritional supplements you are taking or plan to take. Be sure to mention any of the following: alpha blockers such as alfuzosin (Uroxatral), doxazosin (Cardura), prazosin (Minipress), tamsulosin (Flomax), and terazosin (Hytrin); amlodipine (Norvasc); certain antifungals such as itraconazole (Sporanox) and ketoconazole (Nizoral); anticoagulants ('blood thinners') such as warfarin (Coumadin); certain barbiturates such as butalbital (in Esgic-Plus, in Fioricet, in Fiorinal, others) and secobarbital (Seconal); beta blockers such as atenolol (Tenormin), labetalol (Normodyne), metoprolol (Lopressor, Toprol XL), nadolol (Corgard), and propranolol (Inderal); bosentan (Tracleer); cimetidine (Tagamet);efavirenz (Sustiva); erythromycin (E.E.S., E-Mycin, Erythrocin); HIV protease inhibitors including amprenavir (Agenerase), atazanavir (Reyataz), darunavir (Prezista), fosamprenavir (Lexiva), indinavir (Crixivan), lopinavir (in Kaletra), nelfinavir (Viracept), ritonavir (Norvir, in Kaletra), saquinavir (Fortovase, Invirase), and tipranavir (Aptivus); nevirapine (Viramune); other medications or devices to treat erectile dysfunction;medications for high blood pressure; certain medications for seizures including carbamazepine (Carbatrol, Epitol, Tegretol), phenobarbital, and phenytoin (Dilantin, Phenytek); rifabutin (Mycobutin); and rifampin (Rifadin, Rimactane). Your doctor may need to change the doses of your medications or monitor you carefully for side effects. Many other medications may also interact with Sildenafil Citrate, so be sure to tell your doctor about all the medications you are taking, even those that do not appear on this list.
tell your doctor what herbal products you are taking or plan to take, especially St. John's wort.
tell your doctor if you smoke, if you have ever had an erection that lasted for several hours, and if you have recently lost a large amount of body fluids (dehydration). This can happen if you are sick with fever, diarrhea, or vomiting; sweat a lot; or do not drink enough liquids. Also tell your doctor if you have or have ever had pulmonary veno-occlusive disease (PVOD; blockage of veins in the lungs); a stomach ulcer; heart, kidney, or liver disease; a heart attack; an irregular heartbeat; a stroke; chest pain; high or low blood pressure; high cholesterol; a bleeding disorder; blood circulation problems;blood cell problems such as sickle cell anemia (a disease of the red blood cells), multiple myeloma (cancer of the plasma cells), or leukemia (cancer of the white blood cells); conditions affecting the shape of the penis (e.g., angulation, cavernosal fibrosis, or Peyronie's disease); or diabetes. Also tell your doctor if you or any of your family members have or have ever had an eye disease such as retinitis pigmentosa (an inherited eye condition that causes loss of vision) or if you have ever had sudden severe vision loss, especially if you were told that the vision loss was caused by a blockage of blood flow to the nerves that help you see.
tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while taking Sildenafil Citrate, call your doctor.
if you are having surgery, including dental surgery, tell your doctor or dentist that you are taking Sildenafil Citrate.
if you are taking Sildenafil Citrate to treat erectile dysfunction, tell your doctor if you have ever been advised by a health care professional to avoid sexual activity for medical reasons or if you have ever experienced chest pain during sexual activity. Sexual activity may be a strain on your heart, especially if you have heart disease. If you experience chest pain, dizziness, or nausea during sexual activity, call your doctor immediately and avoid sexual activity until your doctor tells you otherwise.
tell all your health care providers that you are taking Sildenafil Citrate. If you ever need emergency medical treatment for a heart problem, the health care providers who treat you will need to know when you last took Sildenafil Citrate.
What special dietary instructions should I follow?
Talk to your doctor about eating grapefruit and drinking grapefruit juice while taking Sildenafil Citrate.

What should I do if I forget a dose?
If you are taking Sildenafil Citrate for erectile dysfunction, you are unlikely to miss a dose since Sildenafil Citrate is taken as needed, not on a regular dosing schedule.

If you are taking Sildenafil Citrate for PAH, take the missed dose as soon as you remember it. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. Do not take a double dose to make up for a missed one.

What side effects can Sildenafil Citrate cause?
Sildenafil Citrate may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:

headache
heartburn
diarrhea
flushing (feeling of warmth)
nosebleeds
difficulty falling asleep or staying asleep
numbness, burning, or tingling in the arms, hands, feet, or legs
muscle aches
changes in color vision (seeing a blue tinge on objects or having difficulty telling the difference between blue and green)
sensitivity to light

Some side effects can be serious. If you experience any of the following symptoms, call your doctor immediately:

sudden severe loss of vision (see below for more information)
blurred vision
sudden decrease or loss of hearing
ringing in ears
erection that is painful or lasts longer than 4 hours
dizziness or lightheadedness
fainting
chest pain
worsening shortness of breath
itching or burning during urination
rash

Some patients experienced a sudden loss of some or all of their vision after they took Sildenafil Citrate or other medications that are similar to Sildenafil Citrate. The vision loss was permanent in some cases. It is not known if the vision loss was caused by the medication. If you experience a sudden loss of vision while you are taking Sildenafil Citrate, call your doctor immediately. Do not take any more doses of Sildenafil Citrate or similar medications such as tadalafil (Cialis) or vardenafil (Levitra) until you talk to your doctor.

There have been reports of heart attack, stroke, irregular heartbeat, bleeding in the brain or lungs, high blood pressure, and sudden death in men who took Sildenafil Citrate for erectile dysfunction. Most, but not all, of these people had heart problems before taking Sildenafil Citrate. It is not known whether these events were caused by Sildenafil Citrate, sexual activity, heart disease, or a combination of these and other causes.Talk to your doctor about the risks of taking Sildenafil Citrate.

Some patients experienced a sudden decrease or loss of hearing after they took Sildenafil Citrate or other medications that are similar to Sildenafil Citrate. The hearing loss usually involved only one ear and may not get better. It is not known if the hearing loss was caused by the medication. If you experience a sudden loss of hearing, sometimes with ringing in the ears or dizziness, while you are taking Sildenafil Citrate, call your doctor immediately. If you are taking Sildenafil Citrate (Viagra) for erectile dysfunction, do not take any more doses of Sildenafil Citrate (Viagra) or similar medications such as tadalafil (Cialis) or vardenafil (Levitra) until you talk to your doctor. If you are taking Sildenafil Citrate (Revatio) for PAH, do not stop taking your medication until you talk to your doctor.

Sildenafil Citrate may cause other side effects. Call your doctor if you have any unusual problems while you are taking Sildenafil Citrate.

If you experience a serious side effect, you or your doctor may send a report to the Food and Drug Administration's (FDA) MedWatch Adverse Event Reporting program online [at http://www.fda.gov/MedWatch/index.html] or by phone [1-800-332-1088].

What storage conditions are needed for Sildenafil Citrate?
Keep Sildenafil Citrate in the container it came in, tightly closed, and out of reach of children. Store Sildenafil Citrate at room temperature and away from excess heat and moisture (not in the bathroom). Throw away any medication that is outdated or no longer needed. Talk to your pharmacist about the proper disposal of your medication.

In case of emergency/overdose
In case of overdose, call your local poison control center at 1-800-222-1222. If the victim has collapsed or is not breathing, call local emergency services at 911.

What other information should I know?
Keep all appointments with your doctor.

Do not let anyone else take your medication. Ask your pharmacist any questions you have about refilling your prescription.

It is important for you to keep a written list of all of the prescription and nonprescription (over-the-counter) medicines you are taking, as well as any products such as vitamins, minerals, or other dietary supplements. You should bring this list with you each time you visit a doctor or if you are admitted to a hospital. It is also important information to carry with you in case of emergencies.

Brand names
Viagra®