Cevimeline drug used in sjogren syndrome drug act on which receptor
Reading File
Finding Sources
Searching the Web
cevimeline receptor mechanism of action muscarinic Sjogren syndrome
Here is a complete, well-sourced answer:
Cevimeline (Evoxac) - Receptor of Action
Cevimeline acts on M1 and M3 muscarinic acetylcholine receptors (mAChRs). It is a quinuclidine derivative of acetylcholine and a direct-acting cholinergic (parasympathomimetic) agonist.
Receptor Selectivity (EC50 values)
| Receptor | EC50 | Clinical Relevance |
|---|---|---|
| M1 | 0.023 µM | Potent agonism - exocrine glands, CNS |
| M3 | 0.048 µM | Primary therapeutic target - salivary & lacrimal glands |
| M5 | 0.063 µM | Weak |
| M2 | 1.04 µM | Much weaker (cardiac) |
| M4 | 1.31 µM | Much weaker |
This confirms cevimeline is highly selective for M1 > M3 >> M2/M4, sparing the M2 receptor (which would cause bradycardia) - giving it a better cardiovascular safety profile compared to pilocarpine.
Mechanism of Action
- Binds and activates M3 receptors on salivary and lacrimal gland epithelium → increases exocrine secretion → relieves xerostomia (dry mouth) and xerophthalmia (dry eyes) in Sjogren syndrome
- M3 receptors also stimulate smooth muscle contraction in the GI and urinary tracts (explains side effects like nausea, abdominal pain)
- M1 receptor activation in glands further augments secretory output
Comparison with Pilocarpine
| Feature | Cevimeline | Pilocarpine |
|---|---|---|
| Receptor | M1, M3 selective | Non-selective (M1-M5) |
| Half-life | ~5 hours (longer) | ~1-2 hours (shorter) |
| Dose | 30 mg TID | 5 mg QID |
| Trade name | Evoxac | Salagen |
| Cardiac risk | Lower (spares M2) | Slightly higher |
Key Points for Exams
- Cevimeline = M1 + M3 muscarinic receptor agonist (selective)
- Used for Sjogren syndrome (dry mouth + dry eyes)
- Contraindicated in narrow-angle glaucoma, uncontrolled asthma, iritis (cholinergic effects)
- Side effects: increased sweating, nausea, diarrhea, rhinitis (all muscarinic)
Sources: [Goodman & Gilman's Pharmacology], [Katzung's Basic & Clinical Pharmacology, 16e], [Scott-Brown's Otorhinolaryngology], and PMC review on cevimeline neuropharmacology
Mc sustance abuse in india Coffee Alcohol Cannabis Inhalants
Finding Sources
Searching the Web
most common substance abuse India statistics cannabis alcohol
Most Common Substance of Abuse in India
Answer: Alcohol ✅
Order of Prevalence in India (National Survey, AIIMS/NDDTC 2018 - Ministry of Social Justice & Empowerment):
| Rank | Substance | Prevalence (population) |
|---|---|---|
| 1 | Alcohol | 14.6% (~16 crore persons) |
| 2 | Cannabis | 2.8% (~3.1 crore persons) |
| 3 | Opioids | 2.1% (~2.26 crore persons) |
| 4 | Sedatives | Lower |
| 5 | Inhalants | 1.7% (mostly children/adolescents) |
Coffee is NOT classified as a substance of abuse in epidemiological surveys - it contains caffeine but is not tracked as a drug of abuse in Indian surveys.
Key Facts (for MCQ purposes)
- Most common substance of abuse in India = Alcohol (consistently across all national surveys - 2004 and 2018)
- Second most common = Cannabis
- Third = Opioids
- Among children/adolescents, inhalants rank higher (cheap, easily available)
- Among treatment-seeking patients in India, alcohol is still the most common reason for seeking de-addiction
- States with highest alcohol use: Chhattisgarh, Tripura, Punjab, Arunachal Pradesh, Goa
The Given Options Ranked:
- ✅ Alcohol - Most common (14.6%)
- Cannabis - Second most common (2.8%)
- Inhalants - Mostly in adolescents/street children
- Coffee - Not a substance of abuse in clinical/epidemiological context
The correct answer is: Alcohol - as per the National Survey on Magnitude of Substance Use in India (AIIMS, 2018) commissioned by the Ministry of Social Justice & Empowerment.
This is a shared conversation. Sign in to Orris to start your own chat.