Flagyl ER Coupon - Flagyl ER 750mg tablet
METRONIDAZOLE is an antiinfective. It is used to treat certain kinds of bacterial and protozoal infections. It will not work for colds, flu, or other viral infections. Compare nitroimidazole antibiotics.
Flagyl ER Coupon - Flagyl ER 750mg tablet

Flagyl ER Side Effects

What should I watch for?

Tell your doctor or health care professional if your symptoms do not improve or if they get worse.

You may get drowsy or dizzy. Do not drive, use machinery, or do anything that needs mental alertness until you know how this medicine affects you. Do not stand or sit up quickly, especially if you are an older patient. This reduces the risk of dizzy or fainting spells.

Avoid alcoholic drinks while you are taking this medicine and for three days afterward. Alcohol may make you feel dizzy, sick, or flushed.

If you are being treated for a sexually transmitted disease, avoid sexual contact until you have finished your treatment. Your sexual partner may also need treatment.


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:

More common


back pain


blurred vision

burning, numbness, tingling, or painful sensations in the hands or feet

changes in speech patterns



decreased vision




eye pain





lack of coordination



shakiness and unsteady walk

slurred speech

stiff neck or back

trouble speaking

unsteadiness, trembling, or other problems with muscle control or coordination

unusual tiredness or weakness


weakness in the arms, hands, legs, or feet

Less common

Black, tarry stools

blood in the urine or stools

body aches or pain


clumsiness or unsteadiness

difficulty with breathing

ear congestion

feeling of pelvic pressure

frequent or painful urination

loss of voice

nasal congestion

pinpoint red spots on the skin

runny nose

skin rash, hives, redness, or itching


stomach and back pain (severe)

unusual bleeding or bruising

vaginal irritation, discharge, or dryness not present before taking the medicine


Bleeding gums


chest pain



dark-colored urine

fast heartbeat


loss of appetite

painful or difficult urination

pains in the stomach, side, or abdomen, possibly radiating to the back

sore throat

sores, ulcers, or white spots on the lips or in the mouth

swollen glands

yellow eyes or skin

Incidence not known

Blistering, peeling, or loosening of the skin

bloody or cloudy urine

burning while urinating

continuing diarrhea

continuing stomach pain


feeling of warmth

increased volume of pale, dilute urine

joint or muscle pain

loss of bladder control

red skin lesions, often with a purple center

red, irritated eyes

redness of the face, neck, arms, and occasionally, upper chest

redness of the skin

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

Abdominal or stomach cramps

dizziness or lightheadedness

feeling of constant movement of self or surroundings


sensation of spinning

trouble sleeping

weight loss

Less common or rare

Change in taste sensation


dry mouth

pain or tenderness around the eyes and cheekbones

tender, swollen glands in the neck

trouble with swallowing

unpleasant or sharp metallic taste

voice changes

Incidence not known

Decreased interest in sexual intercourse

inability to have or keep an erection

loss in sexual ability, desire, drive, or performance

painful sexual intercourse

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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