Side Effects of This Medicine

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.

Stop taking this medicine and get emergency help right away if any of the following side effects occur:

Rare—For all nonsteroidal anti-inflammatory drugs

Fainting; fast or irregular breathing; fast, irregular heartbeat or pulse; hive-like swellings (large) on face, eyelids, mouth, lips, or tongue; puffiness or swelling of the eyelids or around the eyes; shortness of breath, troubled breathing, wheezing, or tightness in chest

Also, stop taking this medicine and check with your doctor immediately if any of the following side effects occur:

More common—for mefenamic acid only

Diarrhea

More common—for phenylbutazone only

Swelling of face, hands, feet, or lower legs; weight gain (rapid)

Symptoms of phenylbutazone overdose

Bluish color of fingernails, lips, or skin; headache (severe and continuing)

Rare—for all nonsteroidal anti-inflammatory drugs

Abdominal or stomach pain, cramping, or burning (severe); bloody or black, tarry stools; chest pain; convulsions (seizures); fever with or without chills; nausea, heartburn, and/or indigestion (severe and continuing); pinpoint red spots on skin; sores, ulcers, or white spots on lips or in mouth; spitting up blood; unexplained nosebleeds; unusual bleeding or bruising; vomiting of blood or material that looks like coffee grounds

Also, check with your doctor as soon as possible if any of the following side effects occur:

More common

Bleeding from rectum (with suppositories); headache (severe), especially in the morning (for indomethacin only); skin rash

Less common or rare

Bladder pain; bleeding from cuts or scratches that lasts longer than usual; bleeding or crusting sores on lips; bloody or cloudy urine or any problem with urination, such as difficult, burning, or painful urination; change in urine color or odor; frequent urge to urinate; sudden, large increase or decrease in the amount of urine; or loss of bladder control; blurred vision or any change in vision; burning feeling in throat, chest, or stomach; confusion, forgetfulness, mental depression, or other mood or mental changes; cough or hoarseness; decreased hearing, any other change in hearing, or ringing or buzzing in ears; difficulty in swallowing; eye pain, irritation, dryness, redness, and/or swelling; hallucinations (seeing, hearing, or feeling things that are not there); headache (severe), throbbing, or with stiff neck or back; hives, itching of skin, or any other skin problem, such as blisters, redness or other color change, tenderness, burning, peeling, thickening, or scaliness; increased blood pressure; irritated tongue; light-colored stools; loosening or splitting of fingernails; muscle cramps, pain, or weakness; numbness, tingling, pain, or weakness in hands or feet; pain in lower back and/or side (severe); swelling and/or tenderness in upper abdominal or stomach area; swelling of face, feet, or lower legs (if taking phenylbutazone, stop taking it and check with your doctor immediately); swelling of lips or tongue; swollen and/or painful glands (especially in the neck or throat area); thirst (continuing); trouble in speaking; unexplained runny nose or sneezing; unexplained, unexpected, or unusually heavy vaginal bleeding; unusual tiredness or weakness; weight gain (rapid) (if taking phenylbutazone, stop taking it and check with your doctor immediately); yellow eyes or skin

Other 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. However, check with your doctor if any of the following side effects continue or are bothersome:

More common

Abdominal or stomach cramps, pain, or discomfort (mild to moderate); diarrhea (if taking mefenamic acid, stop taking it and check with your doctor immediately); dizziness, drowsiness, or lightheadedness; headache (mild to moderate); heartburn, indigestion, nausea, or vomiting

Less common or rare

Bitter taste or other taste change; bloated feeling, gas, or constipation; decreased appetite or loss of appetite; fast or pounding heartbeat; flushing or hot flashes; general feeling of discomfort or illness; increased sensitivity of eyes to light; increased sensitivity of skin to sunlight; increased sweating; irritation, dryness, or soreness of mouth; nervousness, anxiety, irritability, trembling, or twitching; rectal irritation (with suppositories); trouble in sleeping; unexplained weight loss; unusual tiredness or weakness without any other symptoms

Although not all of the side effects listed above have been reported for all of these medicines, they have been reported for at least one of them. However, since all anti-inflammatory analgesics are very similar, it is possible that any of the above side effects may occur with any of these medicines.

Some side effects may occur many days or weeks after you have stopped using phenylbutazone. During this time check with your doctor immediately if you notice any of the following side effects:

Sore throat and fever; ulcers, sores, or white spots in mouth; unusual bleeding or bruising; unusual tiredness or weakness

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