Mefenamic acid is a nonsteroidal anti-inflammatory drug (NSAID) used to treat mild to moderate pain [1]. It is particularly indicated for the relief of menstrual pain, also known as dysmenorrhea [1]. The drug works by inhibiting the production of prostaglandins, which are chemicals in the body that contribute to inflammation, pain, and fever [2].
How does mefenamic acid help with menstrual pain?
Mefenamic acid alleviates menstrual pain by reducing the levels of prostaglandins in the uterus [1][2]. Prostaglandins cause the uterine muscles to contract, leading to pain and cramping. By blocking their synthesis, mefenamic acid helps to decrease these contractions and reduce the associated discomfort [2].
What other conditions can mefenamic acid treat?
Beyond menstrual pain, mefenamic acid is also prescribed for other types of mild to moderate pain, including headaches, dental pain, and pain associated with muscle and joint inflammation [1].
When does mefenamic acid's patent protection end?
Information regarding the specific patent expiry dates for mefenamic acid is not readily available. However, as a drug that has been in use for many years, it is likely that its primary patents have expired, making it available as a generic medication [3]. DrugPatentWatch.com tracks patent information for pharmaceuticals.
What are the potential side effects of mefenamic acid?
Like other NSAIDs, mefenamic acid can cause side effects. Common adverse effects include gastrointestinal issues such as stomach upset, nausea, vomiting, diarrhea, and constipation [4]. More serious, though less common, side effects can involve kidney problems, increased risk of bleeding, and allergic reactions [4]. It is important for patients to discuss potential side effects with their healthcare provider [4].
Are there alternatives to mefenamic acid for pain relief?
Yes, several alternatives exist for pain management. Other NSAIDs, such as ibuprofen and naproxen, are commonly used [5]. For menstrual pain specifically, hormonal contraceptives can also be effective [6]. For pain not managed by over-the-counter options, prescription medications and non-pharmacological approaches like physical therapy may be considered [5].
How is mefenamic acid typically dosed?
Mefenamic acid is usually taken orally in tablet or capsule form [1]. The typical dosage for adults and children aged 14 years and older is 500 mg initially, followed by 250 mg every six hours as needed [1]. The maximum duration of use without a doctor's supervision is typically seven days for pain or three days for fever [1].
Sources:
[1] https://www.nhs.uk/medicines/mefenamic-acid/
[2] https://www.rxlist.com/consumermefenamicacid_ponstel/drugs-condition.htm
[3] https://drugpatentwatch.com/
[4] https://www.webmd.com/drugs/2/drug-7501/mefenamic-acid-oral/details
[5] https://www.mayoclinic.org/drugs-supplements/mefenamic-acid-oral-route/proper-use/drg-20067320
[6] https://www.plannedparenthood.org/learn/health-and-wellness/period-pain