VIAGRA

Who is Viagra for ?

Sildenafil is used to treat impotence in men. Sildenafil increases the body's ability to achieve and maintain an erection during sexual stimulation. this medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.

Sildenafil does not directly cause an erection of the penis, but it alters the body’s response to sexual stimulation by enhancing the effect of the nitric oxide, a chemical that is normally released during stimulation. Nitric oxide causes relaxation of the muscles in the penis, which allows for better blood flow to the penile area.

When should I be careful taking Viagra ?

Before taking sildenafil,

• tell your doctor and pharmacist if you are allergic to sildenafil or any other drugs.
• tell your doctor and pharmacist what prescription and nonprescription medications you are taking, especially amlodipine (Norvasc) or other medications for high blood pressure, cimetidine (Tagamet, Tagamet HB), erythromycin, isosorbide (Imdur, Ismo, Isordil, and others), itraconazole (Sporanox), ketoconazole (Nizoral), nitroglycerin (Nitro-Bid, Nitrostat, and others), other medications to treat impotence, phenobarbital, rifampin (Rifadin, Rimactane), ritonavir (Norvir), saquinavir (Invirase), and vitamins.
• tell your doctor if you have or have ever had a bleeding disorder; heart, kidney, or liver disease; a heart attack; irregular heartbeats; angina; a stroke; high or low blood pressure; sickle cell anemia; multiple myeloma; leukemia; conditions affecting the shape of the penis (e.g., angulation, cavernosal fibrosa, or Peyronie's disease); or a condition known as retinitis pigmentosa.
• if you are having surgery, including dental surgery, tell your doctor or dentist that you take sildenafil.
• tell your doctor if you use amyl nitrate, amyl nitrite, or butyl nitrate.

Side Effects

Although side effects from sildenafil are not common, they can occur. Tell your doctor if any of these symptoms are severe or do not go away:

• headache
• upset stomach
• diarrhea
• dizziness or lightheadedness
• flushing (feeling of warmth)
• nasal congestion (stuffiness)
• changes in vision
• breast enlargement

If you experience any of the following symptoms, call your doctor immediately:

• rash
• painful erection
• prolonged erection (longer than 4 hours)
• fainting
• chest pain
• itching or burning during urination