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Mefenamic acid is used for the short-term treatment of mild to moderate pain from various conditions. It is also used to decrease pain and blood loss from menstrual periods.
Mefenamic acid is known as a nonsteroidal anti-inflammatory drug (NSAID).
OTHER USES: This section contains uses of this drug that are not listed in the approved professional labeling for the drug but that may be prescribed by your health care professional. Use this drug for a condition that is listed in this section only if it has been so prescribed by your health care professional.
Take mefenamic acid by mouth, usually 4 times a day with a full glass of water (8 ounces or 240 millilitres) or as directed by your doctor. Do not lie down for at least 10 minutes after taking this drug. If stomach upset occurs, take mefenamic acid with food or milk. Do not take mefenamic acid with antacids unless directed by your doctor. Certain antacids may change the amount of mefenamic acid absorbed by the body.
Dosage is based on your medical condition and response to therapy. To reduce your risk of stomach bleeding and other side effects, take mefenamic acid at the lowest effective dose for the shortest possible time. Do not increase your dose, take it more frequently, or take it for a longer time than prescribed. Mefenamic acid usually should not be taken for more than 7 days at a time.
If you are taking this drug on an “as needed” basis (not on a regular schedule), remember that pain medications work best if they are used as the first signs of pain occur. If you wait until the symptoms have worsened, the medicine may not work as well.
If you are using mefenamic acid for painful periods, take your first dose as soon as your period starts or pain begins. Usually, you will only need to take it for the first 2 to 3 days of your period.
Inform your doctor if your pain persists or worsens or if you develop new symptoms.
Mefenamic acid is best stored at room temperature away from direct light and moisture. To prevent drug damage, you should not store mefenamic acid in the bathroom or the freezer. There may be different brands of mefenamic acid that may have different storage needs. It is important to always check the product package for instructions on storage, or ask your pharmacist. For safety, you should keep all medicines away from children and pets.
You should not flush mefenamic acid down the toilet or pour them into a drain unless instructed to do so. It is important to properly discard this product when it is expired or no longer needed. Consult your pharmacist for more details about how to safely discard your product.
Before taking mefenamic acid,
Please always consult with your doctor to weigh the potential benefits and risks before taking this mefenamic acid . Mefenamic acidis pregnancy risk category C according to the US Food and Drug Administration (FDA).
FDA pregnancy risk category reference below:
Mefenamic acid should not be taken by pregnant women, especially during the 3rd trimester as it may harm the fetus. Mefenamic acid also passes into breast milk and is not recommended for use while breastfeeding. Only take this medication if your doctor has prescribed it.
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Stop taking mefenamic acid and seek medical attention or call your doctor at once if you have any of these serious side effects:
Less serious side effects may include:
Not everyone experiences these side effects. There may be some side effects not listed above. If you have any concerns about a side-effect, please consult your doctor or pharmacist
Mefenamic acidmay interact with other drugs that you are currently taking, which can change how your drug works or increase your risk for serious side effects. To avoid any potential drug interactions, you should keep a list of all the drugs you are using (including prescription drugs, nonprescription drugs and herbal products) and share it with your doctor and pharmacist. For your safety, do not start, stop, or change the dosage of any drugs without your doctor’s approval.
Tell your doctor if you are taking an antidepressant such as citalopram (Celexa), duloxetine (Cymbalta), escitalopram (Lexapro), fluoxetine (Prozac, Sarafem, Symbyax), fluvoxamine (Luvox), paroxetine (Paxil), sertraline (Zoloft), or venlafaxine (Effexor). Taking any of these drugs with mefenamic acid may cause you to bruise or bleed easily.
Before taking mefenamic acid, tell your doctor if you are taking any of the following drugs:
Mefenamic acid may interact with food or alcohol by altering the way the drug works or increase the risk for serious side effects. Do not use alcohol while taking this medication as it can increase the risk of gastric disturbances and bleeding. Please discuss with your doctor or pharmacist any potential food or alcohol interactions before using this drug.
Mefenamic acid may interact with your health condition. This interaction may worsen your health condition or alter the way the drug works. It is important to always let your doctor and pharmacist know all the health conditions you currently have, especially:
The information provided is not a substitute for any medical advice. You should ALWAYS consult with your doctor or pharmacist before using this mefenamic acid .
Usual Adult Dose for Pain
500 mg orally followed by 250 mg every 6 hours as needed, not to exceed 7 days
Usual Adult Dose for Dysmenorrhea
500 mg orally followed by 250 mg every 6 hours starting with the onset of menses
Usual Pediatric Dose for Pain
14 to 18 years: 500 mg orally followed by 250 mg every 6 hours as needed, not to exceed 7 days
Mefenamic acid is available in the following dosage forms and strengths:
In case of an emergency or an overdose, call your local emergency services or go to your nearest emergency room.
If you miss a dose of mefenamic acid , take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and take your regular dose as scheduled. Do not take a double dose.
Hello Health Group does not provide medical advice, diagnosis or treatment.
Mefenamic Acid. https://www.drugs.com/mtm/mefenamic-acid.html. Accessed June, 30, 2016.
Mefenamic Acid. http://www.everydayhealth.com/drugs/mefenamic-acid. Accessed June, 30, 2016.
Mefenamic Acid. http://www.mayoclinic.org/drugs-supplements/mefenamic-acid-oral-route/description/drg-20070790. Accessed June, 30, 2016.