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Viagra Side Effects

What should I watch for?

If you notice any changes in your vision while taking this drug, call your doctor or health care professional as soon as possible. Stop using this medicine and call your health care provider right away if you have a loss of sight in one or both eyes.

Contact your doctor or health care professional right away if you have an erection that lasts longer than 4 hours or if it becomes painful. This may be a sign of a serious problem and must be treated right away to prevent permanent damage.

If you experience symptoms of nausea, dizziness, chest pain or arm pain upon initiation of sexual activity after taking this medicine, you should refrain from further activity and call your doctor or health care professional as soon as possible.

Do not drink alcohol to excess (examples, 5 glasses of wine or 5 shots of whiskey) when taking this medicine. When taken in excess, alcohol can increase your chances of getting a headache or getting dizzy, increasing your heart rate or lowering your blood pressure.

Using this medicine does not protect you or your partner against HIV infection (the virus that causes AIDS) or other sexually transmitted diseases.

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Common and Rare Side Effects

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur:

Less common

Bladder pain

burning feeling in the chest or stomach

burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings

cloudy or bloody urine

dizziness

increased frequency of urination

indigestion

pain on urination

stomach upset

tenderness in the stomach area

Rare

Abnormal vision

anxiety

behavior change similar to drunkenness

bleeding of the eye

blurred vision

bone pain

breast enlargement

chest pain

chills

cold sweats

confusion

convulsions (seizures)

cool and pale skin

deafness or hearing loss

decrease in amount of urine or the frequency of urination

decreased vision

difficulty in concentrating

dizziness or lightheadedness, especially when getting up suddenly from a lying or sitting position

double vision

drowsiness

dry eyes

dry mouth

dryness, redness, scaling, or peeling of the skin

excessive hunger

eye pain

fainting or faintness

fast, irregular, or pounding heartbeat

feeling of something in the eye

fever or chills

headache (severe or continuing)

increase in the size of the pupil

increased sweating

increased thirst

lower back or side pain

migraine headache

nausea (severe or continuing)

nervousness

nightmares

numbness of the hands

painful, swollen joints

prolonged, painful erection of penis

redness, burning, or swelling of the eyes

redness, itching, or tearing of the eyes

restless sleep

seeing shades of colors differently than before

sensitivity to light

shakiness

skin lesions with swelling

skin paleness

skin rash, hives, or itching

skin ulcers

slurred speech

sore throat

sudden weakness

swelling of the face, hands, feet, or lower legs

trouble breathing

twitching of the muscles

unusual feeling of burning or stinging of the skin

unusual tiredness or weakness

vision changes

vision loss, temporary

Incidence not known

Blindness

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

Aches or pains in the muscles

bloody nose

diarrhea

difficult or labored breathing

flushing

headache

pain or tenderness around the eyes and cheekbones

redness of the skin

sneezing

stomach discomfort following meals

stuffy or runny nose

trouble sleeping

unusually warm skin

Rare

Abdominal or stomach pain

abnormal dreams

anxiety

clumsiness or unsteadiness

cough

diarrhea or stomach cramps (severe or continuing)

difficulty in swallowing

ear pain

increased amount of saliva

increased skin sensitivity

lack of coordination

loss of bladder control

mental depression

nausea

numbness or tingling of the hands, legs, or feet

rectal bleeding

redness or irritation of the tongue

redness, soreness, swelling, or bleeding of the gums

ringing or buzzing in the ears

sensation of motion, usually whirling, either of one's self or of one's surroundings

sexual problems in men (continuing), including failure to experience a sexual orgasm

sleepiness

sores in the mouth and on the lips

tense muscles

trembling and shaking

vomiting

waking to urinate at night

worsening of asthma

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

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