Viagra. General Information

Viagra is a medication used to relax muscles which results in increasing blood flow to particular areas of the body. Viagra is a phosphodiesterase inhibitor. It acts by relaxing and dilating muscles in blood vessels which results in increasing blood flow to particular areas including the area around penis. An increased blood flow to the penis together with sexual stimulation provides achieving and maintaining erection in men.

Brand Name: Revatio, Viagra

Generic: sildenafil

Availability: prescription

Date of Approvement by the FDA:

Producing Company:

Medical forms: blue, film-coated rounded-diamond-shaped tablets (25 mg, 50 mg, 100 mg of sildenafil) for oral administration

Ingredients: active ingredient: sildenafil citrate;

inactive ingredients:

microcrystalline cellulose
anhydrous dibasic calcium phosphate
croscarmellose sodium
magnesium stearate
hypromellose
titanium dioxide
lactose
triacetin
FD & C Blue #2 aluminum lake.

Viagra Indications

Viagra is used to treat erectile dysfunction (ED) or impotence in men. There’s one more brand name for sildenafil which is Revatio. Revatio may be also used to treat the symptoms of pulmonary arterial hypertension and improve exercise capacity both in men and women. Viagra may also be used for other purposes not listed above if it is prescribed by a doctor.

Mechanism of Action

Viagra blocks PDE5 which is a chemical that makes blood leave the penis. The more blood in the penis the better is an erection. When PDE5 is blocked more chemicals which are concerned for erection remain which makes muscles in the penis relaxed. This results in blood staying in the penis for longer which allows it to remain erected.

Viagra does not work without stimulation as the chemicals that cause an erection must be released into the body of the penis; the chemicals get released only when an individual is sexually stimulated. Viagra does not produce any action towards the release of the chemicals; it just helps them stay in the penis for a longer time.

For how long Viagra will be active and when it starts to act depends on each particular individual.

The clinical studies showed the average time between the time of taking Viagra and the time when it started working; this time was 14 minutes. Still for most men Viagra gets active within 30 minutes’ time.

The duration of Viagra’s action is approximately 4 hours, but usually the response decreases after 2 hours’ time.

Before Use. Precautions

A patient should avoid taking Viagra if being allergic to sildenafil, an active component of the medication, or any other of the ingredients of Viagra.

Patients using nitrate drugs for chest pain or any other heart problems should avoid taking Viagra. The drugs for chest pain and other heart problems usually include:

nitroglycerin (Nitrostat, Nitrolingual, Nitro-Dur, Nitro-Bid, Minitran, Deponit, Transderm-Nitro)
isosorbide dinitrate (Dilatrate-SR, Isordil, Sorbitrate)
isosorbide mononitrate (Imdur, ISMO, Monoket)
recreational drugs such as amyl nitrate or nitrite (“poppers”).

The list of the medications is not complete. Using Viagra with any nitrate medication can cause a sudden and serious decrease in blood pressure.

A person should immediately tell a doctor about experiencing the following conditions during a sexual intercourse:

dizziness
nausea
chest pain
numbness
tingling in the chest, arms, neck, or jaw.

The listed side effects may be the sign of serious problems caused by Viagra.

Viagra should not be taken more than once a day. There should be 24 hours between the doses’ administration. A patient should consult a doctor in case his erection lasts for more than 4 hours or is painful. A prolonged erection which is called priapism can damage the penis.

There were a few cases of a sudden vision loss in the patients experiencing the following conditions:

heart disease
diabetes
high blood pressure
high cholesterol level
certain pre-existing eye problems
smoking
being over 50 years old. Continue reading →

How to Use

Viagra should be taken exactly as prescribed by a doctor. The medication should not be used in larger or smaller amounts or for a longer period than written on a prescription label.

A doctor may change the dosage or the way of administrating Viagra to reach better results. A patient should not change the dosage or the way of taking Viagra without consulting a doctor.

Viagra is usually taken when needed 30 minutes before a sexual intercourse. It may take up to 4 hours for Viagra to get into action. Erection does not appear at once as a patient takes Viagra. The medication is not effective without sexual stimulation. Viagra should not be taken more often than once in 24 hours’ time.

If a patient notices the following signs during sexual activity he should immediately stop and call a doctor. Such signs include:

dizziness
nausea
pain
numbness
tingling in the chest, arms, neck, or jaw.

A patient experiencing the named signs may have a serious side effect of Viagra. Continue reading →

Viagra Side Effects

A patient should immediately get an emergency medical help if any of the signs of allergy to any of Viagra ingredients perform:

hives
difficulty breathing
swelling of the face, lips, tongue, or throat.

A patient should get emergency medical help and immediately tell a doctor about experiencing the following conditions during a sexual intercourse:

dizziness
nausea
chest pain
numbness
tingling in the chest, arms, neck, or jaw.

If a patient experiences the named symptoms it may be a sign of a serious side effect caused by Viagra. S patient should stop using the medication and call a doctor if case if having the following signs:

changes in vision or sudden vision loss
ringing in your ears, or sudden hearing loss
chest pain or heavy feeling, pain spreading to the arm or shoulder, nausea, sweating, general ill feeling
irregular heartbeat
shortness of breath, swelling in your hands, ankles, or feet
seizure (convulsions)
feeling light-headed, fainting
penis erection that is painful or lasts 4 hours or longer
redness or warmth in your face, neck, or chest
cold symptoms such as stuffy nose, sneezing, or sore throat
headache
memory problems
diarrhea
upset stomach
muscle pain
back pain.

The list of the side effects above is incomplete. If a patient experiences any other signs which may be associated with Viagra administration he should immediately consult a doctor.

Viagra Overdose

If a patient suspects himself of having overdosed with Viagra he should seek an emergency medical help.

The most common overdose side effects of Viagra include:

chest pain
nausea
irregular heartbeat
and feeling light-headed
fainting.

Storage. Disposal

Viagra should be stored at a room temperature of 25 degrees C (77 degrees F) in a cool dry place out of reach of children and away from pets. The medication should not be kept in a refrigerator. Viagra should be stored in its original container.

A patient should strictly follow the trait of Viagra amount to prevent others to whom it is not prescribed from taking it.

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