Mefenamic acid

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Mefenamic acid
Mefenamic acid2DACS.svg
Mefenamic-acid-from-xtal-3D-bs-17.png
Clinical data
Trade names Ponstel, Ponstan, others
AHFS/Drugs.com Monograph
MedlinePlus a681028
Pregnancy
category
  • AU:C
Routes of
administration 		By mouth, rectal
ATC code
Legal status
Legal status
Pharmacokinetic data
Bioavailability 90%
Protein binding >90%
Metabolism Liver (CYP2C9)
Elimination half-life 2 hours
Excretion Kidney (52–67%), faeces (20–25%)
Identifiers
  • 2-(2,3-dimethylphenyl)aminobenzoic acid
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
CompTox Dashboard (EPA)
ECHA InfoCard 100.000.467 OOjs UI icon edit-ltr-progressive.svg
Chemical and physical data
Formula C15H15NO2
Molar mass 241.290 g·mol−1
3D model (JSmol)
  • O=C(O)c2c(Nc1cccc(c1C)C)cccc2
  • InChI=1S/C15H15NO2/c1-10-6-5-9-13(11(10)2)16-14-8-4-3-7-12(14)15(17)18/h3-9,16H,1-2H3,(H,17,18) Yes check.svgY
  • Key:HYYBABOKPJLUIN-UHFFFAOYSA-N Yes check.svgY
 X mark.svgNYes check.svgY  (what is this?)    (verify)

Mefenamic acid is a member of the anthranilic acid derivatives (or fenamate) class of nonsteroidal anti-inflammatory drugs (NSAIDs), and is used to treat mild to moderate pain. [3] [4]

Contents

Its name derives from its systematic name, dimethylphenylaminobenzoic acid. It was discovered and brought to market by Parke-Davis as Ponstel in the 1960s. It became generic in the 1980s and is available worldwide under many brand names such as Meftal. [5]

Medical uses

Mefenamic acid is used to treat pain and inflammation in rheumatoid arthritis and osteoarthritis, postoperative pain, acute pain including muscle and back pain, toothache and menstrual pain, as well as being prescribed for menorrhagia. [6] [7] [8] In a 10-year study, mefenamic acid and other oral medicines (tranexamic acid) were as effective as the levonorgestrel intrauterine coil; the same proportion of women had not had surgery for heavy bleeding and had similar improvements in their quality of life. [9] [10]

There is evidence that supports the use of mefenamic acid for perimenstrual migraine headache prophylaxis, with treatment starting two days prior to the onset of flow or one day prior to the expected onset of the headache and continuing for the duration of menstruation. [4]

Mefenamic acid is recommended to be taken with food. [11]

Contraindications

Mefenamic acid is contraindicated in people who have shown hypersensitivity reactions such as urticaria and asthma to this drug or to other NSAIDs (e.g. aspirin); those with peptic ulcers or chronic inflammation of the gastrointestinal tract; those with kidney or liver disease; heart failure; after coronary artery bypass surgery; and during the third trimester of pregnancy. [7] [12]

Side effects

Known mild side effects of mefenamic acid include headaches, nervousness, and vomiting. Potentially serious side effects may include diarrhea, gastrointestinal perforation, peptic ulcers, hematemesis (vomiting blood), skin reactions (rashes, itching, swelling; in rare cases toxic epidermal necrolysis) and rarely blood cell disorders such as agranulocytosis. [13] [7] It has been associated with acute liver damage. [14]

In 2008 the US label was updated with a warning concerning a risk of premature closure of the ductus arteriosus in pregnancy. [15]

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. [16] [17] They recommend avoiding NSAIDs in pregnant women at 20 weeks or later in pregnancy. [16] [17]

In its November 2023 monthly drug safety alert under the Pharmacovigilance Programme of India (PvPI), the Indian Pharmacopoeia Commission flagged a risk of DRESS Syndrome due to use of mefenamic acid. [18]

Overdose

Symptoms of overdosing include kidney failure, gastrointestinal problems, bleeding, rashes, confusion, hallucinations, vertigo, seizures, and loss of consciousness. It is treated with induction of vomiting, gastric lavage, bone char, and control of electrolytes and vital functions. [7]

Interactions

Interactions are broadly similar to those of other NSAIDs. Mefenamic acid interferes with the anti–blood clotting mechanism of Aspirin. It increases the blood thinning effects of warfarin and phenprocoumon because it displaces them from their plasma protein binding and increases their free concentrations in the bloodstream. It adds to the risk of gastrointestinal ulcera associated with corticosteroids and selective serotonin reuptake inhibitors. It can increase the risk for adverse effects of methotrexate and lithium by lowering their excretion via the kidneys. It can increase the kidney toxicity of ciclosporin and tacrolimus. Combination with antihypertensive drugs such as ACE inhibitors, sartans and diuretics can decrease their effectiveness as well as increase the risk for kidney toxicity. [7] [8]

Pharmacology

Mechanism of action

Like other members of the anthranilic acid derivatives (or fenamate) class of NSAIDs, it inhibits both isoforms of the enzyme cyclooxygenase (COX-1 and COX-2). This prevents formation of prostaglandins, [14] [19] which play a role in pain sensitivity, inflammation and fever, but also in hemostasis, kidney function, sustaining of pregnancy, and protection of the gastric mucosa. [20]

Pharmacokinetics

Mefenamic acid (top) and its 3'-hydroxymethyl- and 3'-carboxy-metabolites (middle and bottom, respectively). The carboxy groups at the bottom right of each substance can be glucuronidized. Mefenamic acid metabolites.svg
Mefenamic acid (top) and its 3'-hydroxymethyl- and 3'-carboxy-metabolites (middle and bottom, respectively). The carboxy groups at the bottom right of each substance can be glucuronidized.

Mefenamic acid is rapidly absorbed from the gut and reaches highest concentrations in the blood plasma after one to four hours. When in the bloodstream, over 90% of the substance are bound to plasma proteins. It probably crosses the placenta, and is found in the breast milk in small amounts. [7] [12]

It is metabolized by the liver enzyme CYP2C9 to the only weakly active 3'-hydroxymethylmefenamic acid. 3'-carboxymefenamic acid has also been identified as a metabolite, as well as carboxy glucuronides of all three substances. Mefenamic acid and its metabolites are excreted via the urine (52–67%) and the faeces (20–25%, or less than 20% following another source). The parent substance has a biological half-life of two hours; the half-life of its metabolites may be longer. [7] [8] [12]

History

Scientists led by Claude Winder from Parke-Davis invented mefenamic acid in 1961, along with fellow members of the class of anthranilic acid derivatives, flufenamic acid in 1963 and meclofenamate sodium in 1964. [21] U.S. Patent 3,138,636 on the drug was issued in 1964. [22] [23]

It was approved in the UK in 1963 as Ponstan, in West Germany in 1964 as Ponalar and in France as Ponstyl, and the US in 1967 as Ponstel. [14] [23]

Chemistry

Synthesis

Analogous to fenamic acid, this compound may be made from 2-chlorobenzoic acid and 2,3-dimethylaniline. [24]

Conformational flexibility

Mefenamic acid, a member of the fenamate, is a chemical compound derived from anthranilic acid . This derivative is created by substituting one of the hydrogen atoms attached to the nitrogen atom with a 2,3-dimethylphenyl fragment. The result is a structurally complex molecule with fascinating conformational properties.

The mefenamic acid molecule exhibits conformational lability, meaning it can exist in various shapes or conformers. This flexibility arises from changes in the position of the carboxylic acid group and the 2,3-dimethylphenyl fragment about the anthranil moiety. Specifically, the arrangement of the substituted benzene fragments relative to each other plays a crucial role in determining the different polymorphic forms of mefenamic acid. [25]

Recent experimental studies have unveiled two additional hidden conformers of mefenamic acid. [26] These conformers result from alterations in the positions of hydroxyl groups within the molecule. This discovery adds to our understanding of the compound's structural diversity.

External factors, including temperature, pressure, and the surrounding medium, highly influence the conformational state of mefenamic acid. Researchers have conducted extensive investigations into its spatial structure not only in organic solvents [27] but also in supercritical fluids, [28] [29] aerogels, [30] and lipid bilayers. [31] [32] These studies have helped elucidate the impact of different environments on the molecule's conformation.

Society and culture

Availability and pricing

Mefenamic acid is generic and is available worldwide under many brand names. [5]

In the US, wholesale price of a week's supply of generic mefenamic acid has been quoted as $426.90 in 2014. Brand-name Ponstel is $571.70. [33] By contrast, in the UK, a weeks supply is £1.66, or £8.17 for branded Ponstan. [34]

Research

While studies have been conducted to see if mefenamic acid can improve behavior in transgenic mouse models of Alzheimer's disease [35] [36] there is little evidence that mefenamic acid or other NSAIDs can treat or prevent Alzheimer's in humans; clinical trials of NSAIDs other than mefenamic acid for treatment of Alzheimer's have found more harm than benefit. [37] [38] [39] A small controlled study of 28 human subjects showed improved cognitive impairment using mefenamic acid non-steroidal anti-inflammatory therapy. [40]

Related Research Articles

<span class="mw-page-title-main">Nonsteroidal anti-inflammatory drug</span> Class of therapeutic drug for relieving pain and inflammation

Non-steroidal anti-inflammatory drugs (NSAID) are members of a therapeutic drug class which reduces pain, decreases inflammation, decreases fever, and prevents blood clots. Side effects depend on the specific drug, its dose and duration of use, but largely include an increased risk of gastrointestinal ulcers and bleeds, heart attack, and kidney disease.

<span class="mw-page-title-main">Ibuprofen</span> Medication used for treating pain, fever, and inflammation

Ibuprofen is a nonsteroidal anti-inflammatory drug (NSAID) that is used to relieve pain, fever, and inflammation. This includes painful menstrual periods, migraines, and rheumatoid arthritis. It may also be used to close a patent ductus arteriosus in a premature baby. It can be used orally or intravenously. It typically begins working within an hour.

<span class="mw-page-title-main">Diclofenac</span> Nonsteroidal anti-inflammatory drug

Diclofenac, sold under the brand name Voltaren, among others, is a nonsteroidal anti-inflammatory drug (NSAID) used to treat pain and inflammatory diseases such as gout. It is taken by mouth or rectally in a suppository, used by injection, or applied to the skin. Improvements in pain last for as much as eight hours. It is also available in combination with misoprostol in an effort to decrease stomach problems.

<span class="mw-page-title-main">Naproxen</span> Nonsteroidal anti-inflammatory drug (NSAID) used to treat pain

Naproxen, sold under the brand name Aleve among others, is a nonsteroidal anti-inflammatory drug (NSAID) used to treat pain, menstrual cramps, inflammatory diseases such as rheumatoid arthritis, gout and fever. It is taken orally. It is available in immediate and delayed release formulations. Onset of effects is within an hour and lasts for up to twelve hours.

Anti-inflammatory or antiphlogistic is the property of a substance or treatment that reduces inflammation or swelling. Anti-inflammatory drugs, also called anti-inflammatories, make up about half of analgesics. These drugs remedy pain by reducing inflammation as opposed to opioids, which affect the central nervous system to block pain signaling to the brain.

<span class="mw-page-title-main">Indometacin</span> Anti-inflammatory drug

Indometacin, also known as indomethacin, is a nonsteroidal anti-inflammatory drug (NSAID) commonly used as a prescription medication to reduce fever, pain, stiffness, and swelling from inflammation. It works by inhibiting the production of prostaglandins, endogenous signaling molecules known to cause these symptoms. It does this by inhibiting cyclooxygenase, an enzyme that catalyzes the production of prostaglandins.

<span class="mw-page-title-main">Oxaprozin</span> Chemical compound

Oxaprozin, also known as oxaprozinum, is a nonsteroidal anti-inflammatory drug (NSAID), used to relieve the inflammation, swelling, stiffness, and joint pain associated with osteoarthritis and rheumatoid arthritis. Chemically, it is a propionic acid derivative. Safety and efficacy has been established in children over 6 years with juvenile rheumatoid arthritis only, and there is an increased risk of adverse reactions in the elderly population.

<span class="mw-page-title-main">Meloxicam</span> Nonsteroidal anti-inflammatory drug (NSAID)

Meloxicam, sold under the brand name Mobic among others, is a nonsteroidal anti-inflammatory drug (NSAID) used to treat pain and inflammation in rheumatic diseases and osteoarthritis. It is used by mouth or by injection into a vein. It is recommended that it be used for as short a period as possible and at a low dose.

<span class="mw-page-title-main">Ketorolac</span> Nonsteroidal anti-inflammatory drug (NSAID; analgesic)

Ketorolac, sold under the brand name Toradol among others, is a nonsteroidal anti-inflammatory drug (NSAID) used to treat pain. Specifically it is recommended for moderate to severe pain. Recommended duration of treatment is less than six days, and in Switzerland not more than two days. It is used by mouth, by nose, by injection into a vein or muscle, and as eye drops. Effects begin within an hour and last for up to eight hours.

<span class="mw-page-title-main">Etodolac</span> Nonsteroidal anti-inflammatory drug

Etodolac is a nonsteroidal anti-inflammatory drug (NSAID).

<span class="mw-page-title-main">Carprofen</span> Non-steroidal anti-inflammatory drug

Carprofen is a nonsteroidal anti-inflammatory drug (NSAID) of the carbazole and propionic acid class that was previously for use in humans and animals but is now only available to veterinarians for prescribing as a supportive treatment for various conditions in animals. Carprofen reduces inflammation by inhibition of COX-1 and COX-2; its specificity for COX-2 varies from species to species. Marketed under many brand names worldwide, carprofen is used as a treatment for inflammation and pain, including joint pain and postoperative pain.

<span class="mw-page-title-main">Diflunisal</span> NSAID analgesic and anti-inflammatory drug

Diflunisal is a salicylic acid derivative with analgesic and anti-inflammatory activity. It was developed by Merck Sharp & Dohme in 1971, as MK647, after showing promise in a research project studying more potent chemical analogs of aspirin. It was first sold under the brand name Dolobid, marketed by Merck & Co., but generic versions are now widely available. It is classed as a nonsteroidal anti-inflammatory drug (NSAID) and is available in 250 mg and 500 mg tablets.

<span class="mw-page-title-main">Sulindac</span> Nonsteroidal anti-inflammatory drug (NSAID)

Sulindac is a nonsteroidal anti-inflammatory drug (NSAID) of the arylalkanoic acid class that is marketed as Clinoril. Imbaral is another name for this drug. Its name is derived from sul(finyl)+ ind(ene)+ ac(etic acid) It was patented in 1969 and approved for medical use in 1976.

<span class="mw-page-title-main">Tolfenamic acid</span> Non-steroidal anti-inflammatory drug

Tolfenamic acid is a member of the anthranilic acid derivatives class of NSAID drugs discovered by scientists at Medica Pharmaceutical Company in Finland. Like other members of the class, it is a COX inhibitor and prevents formation of prostaglandins.

<span class="mw-page-title-main">Nabumetone</span> NSAID analgesic and anti-inflammatory drug

Nabumetone, sold under the brand name Relafen among others, is a nonsteroidal anti-inflammatory drug (NSAID). Nabumetone was developed by Beecham and first received regulatory approval in 1991.

<span class="mw-page-title-main">Meclofenamic acid</span> Chemical compound

Meclofenamic acid is a drug used for joint, muscular pain, arthritis and dysmenorrhea. It is a member of the anthranilic acid derivatives class of nonsteroidal anti-inflammatory drugs (NSAIDs) and was approved by the US FDA in 1980. Like other members of the class, it is a cyclooxygenase (COX) inhibitor, preventing the formation of prostaglandins.

<span class="mw-page-title-main">Flufenamic acid</span> Chemical compound

Flufenamic acid (FFA) is a member of the anthranilic acid derivatives class of nonsteroidal anti-inflammatory drugs (NSAIDs). Like other members of the class, it is a cyclooxygenase (COX) inhibitor, preventing the formation of prostaglandins. FFA is known to bind to and reduce the activity of prostaglandin F synthase and activate TRPC6.

<span class="mw-page-title-main">Acemetacin</span> NSAID analgesic medication

Acemetacin is a non-steroidal anti-inflammatory drug (NSAID) used for the treatment of osteoarthritis, rheumatoid arthritis, lower back pain, and relieving post-operative pain. It is manufactured by Merck KGaA under the tradename Emflex. It is no longer available in the UK, however is available in other countries as a prescription-only drug.

<span class="mw-page-title-main">Fenamic acid</span> Chemical compound

Fenamic acid is an organic compound, which, especially in its ester form, is called fenamate. serves as a parent structure for several nonsteroidal anti-inflammatory drugs (NSAIDs), including mefenamic acid, tolfenamic acid, flufenamic acid, and meclofenamic acid. These drugs are commonly referred to as "anthranilic acid derivatives" or "fenamates" because fenamic acid is a derivative of anthranilic acid.

<span class="mw-page-title-main">Antiarthritics</span> Drug class

An antiarthritic is any drug used to relieve or prevent arthritic symptoms, such as joint pain or joint stiffness. Depending on the antiarthritic drug class, it is used for managing pain, reducing inflammation or acting as an immunosuppressant. These drugs are typically given orally, topically or through administration by injection. The choice of antiarthritic medication is often determined by the nature of arthritis, the severity of symptoms as well as other factors, such as the tolerability of side effects.

References

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  3. ↑ "Ponstel Label" (PDF). U.S. Food and Drug Administration. 19 February 2008.
  4. 1 2 Pringsheim T, Davenport WJ, Dodick D (April 2008). "Acute treatment and prevention of menstrually related migraine headache: evidence-based review". Neurology. 70 (17): 1555–1563. doi:10.1212/01.wnl.0000310638.54698.36. PMID   18427072. S2CID   27966664.
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  10. ↑ "The coil and medicines are both effective long-term treatments for heavy periods". NIHR Evidence. 8 March 2024. doi:10.3310/nihrevidence_62335.
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  22. ↑ US 3,138,636,Scherrer RA,issued 23 June 1964, assigned to Parke Davis and Co LLC
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  39. ↑ Wang J, Tan L, Wang HF, Tan CC, Meng XF, Wang C, et al. (2015). "Anti-inflammatory drugs and risk of Alzheimer's disease: an updated systematic review and meta-analysis". Journal of Alzheimer's Disease. 44 (2): 385–396. doi:10.3233/JAD-141506. PMID   25227314.
  40. ↑ Melnikov V, Tiburcio-Jimenez D, Mendoza-Hernandez MA, Delgado-Enciso J, De-Leon-Zaragoza L, Guzman-Esquivel J, et al. (2021). "Improve cognitive impairment using mefenamic acid non-steroidal anti-inflammatory therapy: additional beneficial effect found in a controlled clinical trial for prostate cancer therapy". American Journal of Translational Research. 13 (5): 4535–4543. PMC   8205720 . PMID   34150033.

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