Viagra is used to treat erectile dysfunction. It works by reducing it to reach the blood flow to the penis during sexual stimulation, and support and maintain an erection. Viagra relaxes muscles and increases blood flow to certain areas of the body.

What should I tell my doctor before taking this medicine?

You need to know if you have any of these conditions:

• eye or vision problems, including a rare inherited eye disease called retinitis pigmentosa
• heart disease, angina, high or low blood pressure, history of heart attack or other heart problems
• Kidney disease
• Liver disease
• Career
• an allergic reaction to sildenafil, other medicines, foods, dyes, or preservatives
• are pregnant or trying to conceive
• Breastfeeding
How can I keep my medicine?
Take this medicine with a glass of water. Follow the directions on the prescription label. The dose is usually taken an hour before sexual activity. You should not use a dose more than once a day. Take your medicine more often than prescribed.

Overdosage: If you think you have taken too much of this medicine contact a poison control center or emergency room.

What happens if I miss a dose?
This does not apply. Do not take double or extra doses.

What may interact with this medicine?
Take this medicine with any of the following drugs:
• Cisapride
• methscopolamine nitrate
• nitrates like amyl nitrite, isosorbide dinitrate, isosorbide mononitrate, nitroglycerin
• Nitroprusside
• other products sildenafil

This medicine may also interact with the following medications:
• Some medicines for high blood pressure
• Some medicines for treating HIV infection or AIDS
• Some medicines for fungal or yeast infections, like fluconazole, itraconazole, ketoconazole, and voriconazole
• cimetidine
• Erythromycin
• Rifampicin

This list may not describe all possible interactions. Give your doctor a list of all the medicines, herbs, non-prescription drugs, or dietary supplements you take. I also tell them if you smoke, drink alcohol or use illegal drugs. Some items may have side effects.

What should I watch for while using this medicine?
If you notice changes in your vision while taking this medicine, contact your doctor or health care professional as soon as possible. Call your doctor immediately if you have a change of perspective. Contact your doctor or emergency room immediately if the erection lasts longer than 4 hours or if it becomes painful. This may indicate a serious problem and must be treated immediately to prevent permanent damage. If you experience symptoms like nausea, dizziness, chest pain or arm pain after the onset of sexual activity after taking this medication, you should refrain from further activity and call your doctor or health care professional as soon as possible. With the help of this drug does not protect you or your partner against HIV infection (the virus that causes AIDS) or other sexually transmitted diseases.

What side effects may I notice from this medicine?
Side effects with your doctor or health care professional as soon as possible:
• allergic reactions like skin rash, itching or hives, swelling of face, lips or tongue
• respiratory problems
• changes in hearing
• changes in vision, blurred vision, trouble telling blue from green
• Chest pain
• fast heartbeat, irregular
• Men: painful or prolonged erection (lasting longer than 4 hours)
• Attacks

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):
• Diarrhea
• Wash
• Headaches
• ndigestion

Stuffy or runny nose • Where can I keep my medicine?
Keep out of reach of children.
Store at room temperature between 15 and 30 degrees C (59 and 86 degrees F). Throw away any unused medicine after the expiration date.

Do not take Viagra if you are prescribed nitrates, often used for chest pain, light, as this may cause a sudden, without knowing the blood pressure.

Talk about your general health with your doctor to make sure you are healthy enough for sexual acts. If you experience chest pain, nausea or discomfort during sex, seek immediate medical help.

More in the rare case of an erection that lasts more than 4 hours, seek immediate medical attention to avoid long term injuries.
If you have more than 65 years, or severe liver problems or kidney problems, your doctor can help you the lowest dose (25 mg), starting with VIAGRA. If you are the protease inhibitors, such as for the treatment of HIV, your doctor may recommend a dose of 25 mg and can be used for a maximum single dose of 25 mg of VIAGRA in a 48-hour time limit.

In rare cases, people reported taking PDE5 inhibitors (oral erectile dysfunction, including Viagra), a sudden decrease or loss of vision. It is not possible to determine whether these events are related directly to these medicines or other factors. If you have a sudden decrease or loss of vision, stop taking PDE5 inhibitors, including VIAGRA, and call a doctor.

Sudden decrease or loss of hearing was rarely in people taking PDE5 inhibitors, including VIAGRA reported. It is not possible to determine whether these events are related directly to the PDE5 inhibitors or other factors. If you have a sudden decrease or loss of hearing, stop taking Viagra and seek medical help.

If you have prostate problems or high blood pressure are taking medicines called alpha blockers, your doctor may prescribe a lower dose of Viagra to get.

VIAGRA with other treatments, can lead to erections. VIAGRA should not be used as Revatio Revatio contains sildenafil, the same drug Viagra.

VIAGRA does not protect against sexually transmitted diseases, including HIV.

The most common side effects of Viagra are headache, facial flushing, upset stomach. Less commonly, bluish vision, blurred vision or sensitivity to light soon.