|Trade names||Meclomen, Ponstel, other|
|Other names||Meclofenamate, meclofenamate sodium|
|Drug class||Nonsteroidal anti-inflammatory drugs (NSAIDs)|
|Main uses||Pain, inflammation|
|Side effects||Headache, dizziness, nausea, abdominal pain, rash|
|Typical dose||50 to 100 mg TID or QID|
|US NLM||Meclofenamic acid|
|Chemical and physical data|
|Molar mass||296.15 g·mol−1|
Meclofenamic acid, also known as meclofenamate, is a nonsteroidal anti-inflammatory drugs (NSAIDs) used for pain and inflammation. This includes in conditions such as painful periods, osteoarthritis, and rheumatoid arthritis. It is taken by mouth.
Common side effects may include headache, dizziness, nausea, abdominal pain, and rash. Other side effects may include gastrointestinal bleeding, swelling, allergic reactions, stomach perforation, and stroke. Use in the later part of pregnancy may harm the baby. It works by blocking COX-1 and COX-2 decreasing the formation of prostaglandins.
Meclofenamic acid was approved for medical use in the United States in 1980. It is available as a generic medication. In the United States 30 pills of 250 mg costs about 46 USD. It is sold under the brand name Meclomen among others.
It is used at a dose of 50 to 100 mg three to four times per day.
In October 2020, the U.S. Food and Drug Administration (FDA) required the drug label to be updated for all nonsteroidal anti-inflammatory medications to describe the risk of kidney problems in unborn babies that result in low amniotic fluid. They recommend avoiding NSAIDs in pregnant women at 20 weeks or later in pregnancy.
Scientists led by Claude Winder from Parke-Davis invented meclofenamate sodium in 1964, along with fellow members of the class, mefenamic acid in 1961 and flufenamic acid in 1963.: 718 Patents on the drug expired in 1985: 295 and several generics were introduced in the US, but as of July 2015 only Mylan still sold it.
Meclofenamic acid is sold under the trade name "Arquel" for use in horses, and is administered as an oral granule form at a dose of 2.2 mg/kg/day. It has a relatively slow onset of action, taking 36–48 hours for full effect, and is most useful for treatment of chronic musculoskeletal disease. It has been found to be beneficial for the treatment of navicular syndrome, laminitis, and osteoarthritis, in some cases having a more profound effect than the commonly used NSAID phenylbutazone. However, due to cost, it is not routinely used in practice. Toxicity due to excessive dosage is similar to that of phenylbutazone, including depression, anorexia, weight loss, edema, diarrhea, oral ulceration, and decreased hematocrit.
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