Does mafmanic acid affects the menstrual flow ?
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You're likely referring to mefenamic acid (a common NSAID) — "mafmanic acid" appears to be a spelling variation. Here's a comprehensive answer:
Mefenamic Acid and Menstrual Flow
Yes — mefenamic acid reduces menstrual blood flow. This is one of its established clinical uses.
Mechanism of Action
Mefenamic acid is an NSAID that inhibits cyclooxygenase (COX-1 and COX-2) enzymes, which are responsible for synthesizing prostaglandins (particularly PGE₂ and PGF₂α). These prostaglandins:
- Promote uterine vasodilation and increase blood flow to the uterus
- Stimulate myometrial contractions, which contribute to both pain and bleeding
By blocking prostaglandin synthesis, mefenamic acid reduces uterine blood flow and decreases menstrual blood loss (MBL).
Clinical Effect on Menstrual Flow
- Reduces menstrual blood loss by ~30–50% compared to placebo
- One study: mean MBL on placebo was 70.7 mL vs 47.3 mL on mefenamic acid (p < 0.001)
- It is less effective than tranexamic acid, danazol, or the levonorgestrel IUD for heavy menstrual bleeding (HMB), but is widely used due to its tolerability and dual benefit (pain + bleeding) — Berek & Novak's Gynecology
- It is more effective than ethamsylate or oral progestogens for reducing HMB — Cochrane Systematic Review (PMID: 36017945)
Approved Indications Related to Menstruation
| Indication | Dosing |
|---|---|
| Primary dysmenorrhea | 500 mg three times daily at onset of menstrual pain |
| Menorrhagia (heavy menstrual bleeding) | 500 mg three times daily from onset of bleeding |
| Premenstrual syndrome (PMS) | 500 mg three times daily from onset of symptoms |
| Menstrual migraine prophylaxis | 250 mg three times daily (days −3 to +3) |
— Harrison's Principles of Internal Medicine 22E; Pfizer Prescribing Information
Bottom Line
Mefenamic acid decreases menstrual flow — it does not increase or stop it entirely. It is a first-line medical option for women with heavy or painful periods who prefer a non-hormonal approach. However, for significantly heavy bleeding (menorrhagia), tranexamic acid or hormonal options are more effective.
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