meftal spas
Reading File
Finding Sources
Finding Sources
Searching the Web
Meftal Spas mefenamic acid dicyclomine uses dosage side effects
Reading File
Reading File
Searching PubMed
mefenamic acid dysmenorrhea efficacy
Here is a full breakdown of Meftal Spas:
Meftal Spas
Composition
| Component | Class | Dose per tablet |
|---|---|---|
| Mefenamic Acid | NSAID (Fenamate) | 250 mg |
| Dicyclomine HCl | Anticholinergic antispasmodic | 10 mg |
Mechanism of Action
Mefenamic Acid
A fenamate-class NSAID (anthranilic acid derivative). It works by inhibiting prostaglandin synthesis via non-selective COX-1 and COX-2 inhibition. Prostaglandins (especially PGE2 and PGF2α) are the primary mediators of uterine cramping and visceral pain. By reducing their production, mefenamic acid lowers the intensity and duration of cramps and pain.
Additionally, mefenamic acid acts as a functional antagonist at prostaglandin receptors - a dual action that makes it particularly effective for dysmenorrhea compared to some other NSAIDs. - Goodman & Gilman's Pharmacological Basis of Therapeutics
Dicyclomine HCl
A synthetic tertiary amine anticholinergic (muscarinic receptor antagonist) with additional local anesthetic activity. It directly relaxes smooth muscle of the GI tract and uterus by reducing acetylcholine-mediated spasm. This provides fast relief from cramping and colic. - Barash Clinical Anesthesia, 9e
The combination provides a dual attack on pain: mefenamic acid addresses the underlying prostaglandin-mediated inflammation, while dicyclomine provides direct smooth-muscle relaxation.
Indications (Uses)
- Primary dysmenorrhea - the most common use; relieves menstrual cramps and heavy bleeding-associated pain
- Abdominal/intestinal spasms - cramping from IBS, gastroenteritis, or functional bowel disorders
- Renal colic - ureteral smooth muscle spasm due to kidney stones
- Biliary colic - bile duct spasm
- Post-operative abdominal pain with spasm
- Visceral pain of mild to moderate intensity
Dosage
| Route | Dose | Frequency |
|---|---|---|
| Oral | 1 tablet (Mefenamic 250 mg + Dicyclomine 10 mg) | 3 times daily |
| Max duration (short-term use) | Typically 2-3 days for dysmenorrhea | Up to 7 days for other indications |
- Take with food and a full glass of water to reduce GI irritation.
- Not recommended in children under 12 years.
Side Effects
Common
- Nausea, vomiting, epigastric discomfort
- Diarrhea (can be severe with mefenamic acid)
- Dry mouth, blurred vision (anticholinergic - dicyclomine)
- Dizziness, drowsiness
- Headache
Serious / Rare
- GI bleeding or ulceration (NSAID class effect)
- Autoimmune hemolytic anemia - rare but potentially serious with mefenamic acid
- Reversible hepatic transaminase elevation (~5% of patients) - Goodman & Gilman's
- Seizures - mefenamic acid overdose has notably higher CNS toxicity compared to other NSAIDs (convulsions more common) - Tintinalli's Emergency Medicine
- Urinary retention (anticholinergic effect)
- Pseudoporphyria (skin blistering on sun-exposed areas) - rare - Fitzpatrick's Dermatology
Contraindications
- Peptic ulcer disease or active GI bleeding
- Known allergy to mefenamic acid, dicyclomine, or any NSAID (cross-reactivity with aspirin-sensitive asthma)
- Severe renal or hepatic impairment
- Glaucoma (dicyclomine raises intraocular pressure)
- Urinary retention / BPH (anticholinergic)
- Pregnancy (especially 3rd trimester - NSAIDs cause premature closure of ductus arteriosus)
- Myasthenia gravis
- Children under 12
Precautions & Drug Interactions
- Alcohol: increases risk of GI bleeding and dizziness
- Anticoagulants (warfarin): mefenamic acid potentiates bleeding risk
- Lithium / Methotrexate: NSAIDs reduce renal clearance of both - toxicity risk
- Thyroid medications: mefenamic acid can displace T3/T4 from TBG, affecting thyroid tests - Katzung Basic & Clinical Pharmacology, 16e
- Other anticholinergics: additive dry mouth, urinary retention, confusion
- Antihypertensives (ACE inhibitors, diuretics): NSAIDs blunt their effect and increase risk of acute kidney injury
- Use cautiously in elderly patients (both NSAID toxicity and anticholinergic burden are problematic)
Important Safety Note (India-specific)
In November 2023, the Indian Pharmacopoeia Commission and CDSCO issued an alert about mefenamic acid-associated adverse drug reactions including severe allergic reactions. Meftal Spas should be used only when clearly indicated and for the shortest duration needed.
Summary
Meftal Spas is effective for short-term relief of menstrual and visceral cramps due to its synergistic mechanism. The Medanta guide on Meftal Spas notes its narrow safety margin - it should not be used casually or long-term without medical supervision.
drotaverin
Finding Sources
Searching the Web
drotaverine mechanism of action PDE4 inhibitor smooth muscle uses dosage side effects
Reading File
Searching PubMed
drotaverine antispasmodic clinical trial
Reading File
Excellent - rich textbook data found. Here is the complete profile:
Drotaverine (Drotin / No-Spa)
Drug Class & Chemistry
Drotaverine hydrochloride is a benzylisoquinoline antispasmodic, structurally related to papaverine. It is classified as a myotropic spasmolytic - meaning it relaxes smooth muscle directly, independent of the autonomic nervous system.
Mechanism of Action
Drotaverine is a selective inhibitor of phosphodiesterase type 4 (PDE4). This is its primary and defining mechanism. - Yamada's Textbook of Gastroenterology, 7e
The cascade works as follows:
- PDE4 inhibition → prevents breakdown of intracellular cyclic AMP (cAMP)
- Elevated cAMP → activates Protein Kinase A (PKA)
- PKA phosphorylates myosin light chain kinase (MLCK) → inactivates it
- Inactivated MLCK cannot phosphorylate myosin → smooth muscle cannot contract
- Additionally: elevated cAMP triggers SERCA pump activity → sequesters Ca²⁺ back into SR, and activates K⁺ channels → membrane hyperpolarization → Ca²⁺ channel closure → reduced intracellular Ca²⁺
The net result is smooth muscle relaxation in the GI tract, biliary tree, urinary tract, and uterus.
Key differentiator from dicyclomine:
Drotaverine has NO anticholinergic effects - it does not block muscarinic receptors. This means no dry mouth, urinary retention, blurred vision, or tachycardia.
Indications (Uses)
| System | Condition |
|---|---|
| GI tract | Abdominal cramps, IBS (spasm-predominant), gastroenteritis |
| Biliary | Biliary colic, biliary dyskinesia, cholecystitis (adjunct) |
| Urinary | Renal colic (kidney stones), ureteral spasm |
| Gynecology | Primary dysmenorrhea, uterine cramps |
| Obstetrics | Cervical dilatation during labour - used in India/Eastern Europe to shorten first stage of labour |
| Vascular | Vasomotor spasm-associated conditions |
Clinical Evidence
From a Cochrane systematic review and meta-analysis (29 studies, 2,333 patients), antispasmodics as a class showed significant benefit over placebo for IBS:
- Abdominal pain improvement: RR 1.32 (95% CI 1.12-1.55), NNT = 7
- Global assessment: RR 1.49, NNT = 5
- Symptom score: NNT = 3
Specifically for drotaverine (2 trials, 150 patients): NNT = 2 (95% CI 2-3) - one of the best NNTs among individual antispasmodics studied. - Yamada's Textbook of Gastroenterology, 7e
An RCT (2022, PMID 36910347) confirmed drotaverine shortens the duration of the first stage of labour in primigravidas.
Dosage
| Route | Dose | Frequency |
|---|---|---|
| Oral (tablet) | 40-80 mg | 2-3 times daily |
| Injection (IM/IV) | 40 mg (2 ml of 20 mg/ml) | Slow IV or IM; repeat in 30 min if needed |
| Obstetric use | 40 mg IV | At cervical os ≥3 cm dilatation |
- Maximum daily dose: 240 mg/day orally
- Onset: ~30 min oral; ~10-15 min IM; ~3-5 min IV
Side Effects
Drotaverine is generally very well tolerated because it lacks anticholinergic activity.
Occasional:
- Nausea, heartburn
- Headache, dizziness
- Palpitations (at higher doses - mild PDE3 cross-inhibition)
- Hypotension (IV route, especially if given too fast)
- Flushing
Rare:
- Allergic reactions
- Constipation
Notably absent (compared to anticholinergics): dry mouth, blurred vision, urinary retention, tachycardia, confusion
Contraindications
- Severe hepatic, renal, or cardiac failure
- Severe hypotension
- Children under 6 years (injection form)
- Hypersensitivity to drotaverine
- Caution in: breastfeeding (excreted in milk), glaucoma (some sources flag this though mechanism is non-anticholinergic)
Drotaverine vs. Dicyclomine - Key Comparison
| Feature | Drotaverine | Dicyclomine |
|---|---|---|
| Mechanism | PDE4 inhibitor (myotropic) | Muscarinic antagonist (neurotropic) |
| Anticholinergic SE | None | Dry mouth, blurred vision, urinary retention |
| Suitable in glaucoma/BPH | Generally yes | Contraindicated |
| Cardiovascular SE | Minimal | Tachycardia possible |
| Onset (oral) | ~30 min | ~30-60 min |
| Labour use | Yes (cervical ripening) | No |
Important Notes
- Drotaverine is not available in the USA or Western Europe but is extremely widely used in India, Eastern Europe, Russia, and the Middle East.
- In India it is available as Drotin (40 mg tablets), Drotin-M (drotaverine + mefenamic acid), and No-Spa (import brand).
- Drotin-M (drotaverine 80 mg + mefenamic acid 250 mg) is a common alternative to Meftal Spas - same NSAID component but replaces dicyclomine with drotaverine, offering better tolerability with no anticholinergic burden.
This is a shared conversation. Sign in to Orris to start your own chat.