The following side effects may get better over time as your body gets used to the medication. Let your healthcare provider know immediately if you continue to experience these symptoms or if they worsen over time.
Common Side Effects
- Stomach pain
- Nausea
- Upset stomach or indigestion
- Gas
- Diarrhea
- Constipation
- Heartburn
- Vomiting
- Dizziness
- Headache
- Rash
Less Common Side Effects
- Dry mouth
- Fast heart rate
- Fever
- Infection
- High blood pressure
- Anxiety
- Shortness of breath
- Blurred vision
Mefenamic Acid serious side effects
Contact your healthcare provider immediately if you experience any of the following.
- Stomach bleeding: feeling faint, vomiting blood, bloody or dark stools, severe stomach pain or discomfort
- Heart attack: chest pain or tightness, pain that radiates up to your shoulder, arm, neck, or jaw
- Stroke: chest pain, trouble breathing, weakness in one part of your body or face, slurred speech
- Heart failure: difficulty breathing, swelling, fast heartbeat
- Liver problems: swelling of your stomach, yellowing of your skin or the whites of your eyes, confusion, dark or brown urine
- Kidney problems: tiredness, dry and itchy skin, low appetite, urinating less than usual, foamy or bloody urine, muscle cramps
- Allergic reactions: hives, rash, blisters, swelling of the lips or tongue, difficulty breathing
- Serious skin reactions: skin reddening, blisters, rash
Source: DailyMed
The following Mefenamic Acid side effects have also been reported
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
Bloody urine
bloody, black, or tarry stools
decreased frequency or amount of urine
increased bleeding time
increased blood pressure
increased thirst
indigestion
itching skin
loss of appetite
lower back or side pain
pale skin
rashes
severe abdominal pain, cramping, or burning
stomach bloating
swelling of the face, fingers, feet, or lower legs
trouble breathing with or without exertion
unusual bleeding or bruising
unusual tiredness or weakness
vomiting
vomiting of material that looks like coffee grounds, severe and continuing
Less common
Bleeding gums
blood in vomit
blurred vision
burning feeling in the chest or stomach
clay-colored stools
cloudy urine
confusion
cough or hoarseness
dark urine
difficult or labored breathing
difficult, burning, or painful urination
difficulty in swallowing
dilated neck veins
dizziness
extreme fatigue
fainting
fast, pounding, or irregular heartbeat or pulse
fever or chills
frequent urge to urinate
headache
increased volume of pale, dilute urine
irregular breathing
irregular heartbeat
large, flat, blue, or purplish patches in the skin
light-colored stools
lightheadedness
nervousness
noisy breathing
pain or burning feeling in the throat
pinpoint red or purple spots on the skin
pounding in the ears
rapid, slow breathing
redness, swelling, or soreness of the tongue
severe or continuing stomach pain
slow heartbeat
sores, ulcers, or white spots on the lips or tongue or inside the mouth
stomach upset
swelling or inflammation of the mouth
swollen glands
tenderness in the stomach area
tightness in the chest
unpleasant breath odor
upper right stomach pain
yellow eyes and skin
Rare
Blistering, peeling, or loosening of the skin
change in consciousness
chest discomfort
continuing vomiting
cracks in the skin
dizziness, faintness, or lightheadedness when suddenly getting up from a lying or sitting position
drowsiness
fever with or without chills
flushed, dry skin
fruit-like breath odor
general body swelling
general feeling of illness
high fever
increased hunger
irregular, fast or slow, or shallow breathing
joint or muscle pain
large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs
leg pain
loss of consciousness
loss of heat from the body
no blood pressure
no breathing
no pulse
nosebleeds
painful glands
pain or discomfort in the arms, jaw, back, or neck
pains in the stomach, side, or abdomen, possibly radiating to the back
pale or blue lips, fingernails, or skin
puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
racing heartbeat or pulse
red skin lesions, often with a purple center
red, irritated eyes
red, swollen skin
redness or soreness of the skin
seeing, hearing, or feeling things that are not there
seizures
severe headache
sores, welting, or blisters
stiff neck or back
sweating
swollen, painful, or tender lymph glands in the neck, armpit, or groin
unexplained weight loss
Get emergency help immediately if any of the following symptoms of overdose occur:
Symptoms of overdose
Unusual drowsiness, dullness, tiredness, weakness, or feeling of sluggishness
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
Continuing ringing or buzzing or other unexplained noise in the ears
excess air or gas in the stomach or intestines
feeling of fullness
hearing loss
passing gas
stomach discomfort
Less common
Burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
discouragement
fear
feeling of constant movement of self or surroundings
feeling sad or empty
hair loss, thinning of the hair
increased sensitivity of the skin to sunlight
irritability
lack of appetite
lack of interest or pleasure
lack or loss of strength
redness or other discoloration of the skin
sensation of spinning
severe sunburn
sleepiness
trouble concentrating
trouble sleeping
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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