You are not supposed to take Viagra if you are using drugs for Chest Pain or heart problem. This includes nitroglycerin (Nitrostat, Nitrolingual, Nitro-Dur, Nitro-Bid, and others), isosorbide dinitrate (Dilatrate-SR, Isordil, Sorbitrate), and isosorbide mononitrate (Imdur, ISMO, Monoket). Nitrates are also found in some recreational drugs such as amyl nitrate or nitrite (”poppers”). As Taking Sildenafil with a nitrate medicine can cause a serious decrease in blood pressure, leading to fainting, stroke or heart attack; as Sildenafil core function is to meddle with how the heart functions; therefore Viagra combine with the effects of these drugs, is the perfect recipe for disaster.

A number of people have been reported a sudden loss of vision after the intake Sildenafil. This type of vision loss is caused by decreased blood flow to the optic nerve of the eye. This sudden loss of vision has been widely reported in patient having history of heart disease, diabetes, high blood pressure, high cholesterol, or certain pre-existing eye problems, and in those who smoke or are over 50 years old.

Before taking Sildenafil, tell your doctor if you have:

Heart disease or heart rhythm problems
A recent history (in the past 6 months) of a heart attack, stroke, or heart rhythm disorder
Congestive heart failure
High or low blood pressure
Coronary artery disease
Liver disease
Kidney disease
A blood cell disorder such as sickle cell anemia, multiple myeloma, or leukemia
A bleeding disorder such as hemophilia
A stomach ulcer
Retinitis pigmentosa (an inherited condition of the eye)
A physical deformity of the penis (such as peyronie’s disease)
If you have been told you should not have sexual intercourse for health reasons

If dizziness, nausea or pain, numbness or tingling in the chest, arms, neck or jaw during sexual activity are experienced; Immediately seek the help of the doctor

At the time of sudden loss of vision after the intake of Sildenafil, without any delay see a doctor.

After the intake Sildenafil if you experience the following allergies that are hives, difficulty breathing, swelling of face, lips, tongue, or throat immediately seek the help of a doctor.

At the emergence of the following complaint prior to the use of Sildenafil that are chest pain or heavy feeling, pain spreading to the arm or shoulder, nausea, sweating, general ill feeling. Quickly see a doctor.

Following are the side effects that are mostly reported and if these occur you are advised to immediately seek the help of the nearest doctor:

Irregular heartbeat.
Swelling in hands, ankles, or feet.
Shortness of breath.
Vision changes.
Feeling light-headed, fainting.
Penis erection that is painful or lasts 4 hours or longer.

Continue taking Sildenafil and talk with your doctor if you have any of these less serious side effects:

Warmth or redness in your face, neck, or chest.
Stuffy nose.
Headache.
Upset stomach.
Back pain.