1. Clinical & Scientific Overview
Dextromethorphan Hydrobromide & Levodropropizine (TIP-MED-000181, Reference Code [9.17]) is classified under
Respiratory, Asthma, COPD & Allergy Medicines (Ch 09) as a Central Medullary Sigma-1/NMDA Cough Suppressant & Peripheral Sensory C-Fibre Antitussive (Schedule H).
Within the Indian regulatory and compendial framework, it is governed under Schedule H Prescription Drug (To be sold by retail on the prescription of a Registered Medical Practitioner only — Drugs Rules 1945).
Representative Indian Market Examples (Edition 2.7 Ch 09 [9.17], p. 122): Dextromethorphan (DXM): Benadryl DR, Alex (Glenmark), Tossex DMR, Lastuss CT, Corex DX (Pfizer). Levodropropizine: Reswas (Dr. Reddy's), Levotuss, Rapitus (Macleods) — Strengths & Dosage Forms: Dextromethorphan Syrup: 10 mg or 15 mg per 5 mL; Lozenges: 5–10 mg. Levodropropizine Syrup: 30 mg/5 mL; Tablets: 60 mg
Dextromethorphan Syrup: 10 mg or 15 mg per 5 mL; Lozenges: 5–10 mg. Levodropropizine Syrup: 30 mg/5 mL; Tablets: 60 mg
3. Mechanism of Action & Pharmacodynamics
Central Medullary Sigma-1/NMDA Cough Suppressant & Peripheral Sensory C-Fibre Antitussive (Schedule H) acting on target receptor/enzyme pathways in Respiratory, Asthma, COPD & Allergy Medicines (Ch 09): clinical efficacy is mediated via Central Medullary Sigma-1/NMDA Cough Suppressant & Peripheral Sensory C-Fibre Antitussive (Schedule H) for Short-term symptomatic relief of exhausting, non-productive (DRY, hacking, post-viral) cough that disturbs sleep.
4. Therapeutic Indications & Evidence-Supported Uses
- Short-term symptomatic relief of exhausting, non-productive (DRY, hacking, post-viral) cough that disturbs sleep
🇮🇳 Jurisdiction & Indication Note: Indications and schedules reflect Indian compendial and regulatory records (CDSCO / Indian Pharmacopoeia & NFI / NLEM 2022). Where international reference labels (US FDA DailyMed / NCBI StatPearls) are cited for pharmacokinetic or mechanistic parameters, international approvals do not automatically imply CDSCO approval in India.
5. Educational Dosage Context, Formulations & Administration
Educational Dosing & Regimen Summary: Dextromethorphan (Adults): 10–20 mg (5–10 mL) PO TDS–QID (Max 120 mg/day). Levodropropizine (Adults): 60 mg (10 mL or 1 tablet) PO up to TDS at >=6-hour intervals (Children >2 yr: 1 mg/kg TDS)
Administration & Meal Timing: May be taken with or without food; take Levodropropizine between meals | Every 6–8 Hours PRN (especially at Bedtime to permit sleep)
6. Pharmacokinetics, Metabolism & Renal/Hepatic Adjustment
Absorption, distribution, metabolism, and excretion follow class pharmacokinetic profile; verify patient renal/hepatic function.
Renal & Hepatic: Avoid in severe hepatic or renal impairment
Renal & Hepatic: Avoid in severe hepatic or renal impairment
Renal & Hepatic: Avoid in severe hepatic or renal impairment
7. Contraindications, Precautions & High-Risk Warnings
- CONTRAINDICATIONS: (1) NEVER use in Productive ('Wet') Cough, COPD, Bronchiectasis, Pneumonia, or Acute Asthma (causes mucus plugging!). (2) Dextromethorphan is STRICTLY CONTRAINDICATED with MAO Inhibitors (Linezolid, Selegiline) and caution with SSRIs/SNRIs/Tramadol (precipitates Serotonin Syndrome!). (3) Avoid OTC cough/cold combinations in children <4 years!
Key Clinical Precautions: Renal & Hepatic: Avoid in severe hepatic or renal impairment
8. Adverse Effects Profile
- Dextromethorphan: Drowsiness, dizziness, nausea, constipation. Levodropropizine: Minimal CNS sedation (<5% — acts peripherally on tracheobronchial C-fibres!)
- Serotonin Syndrome (Dextromethorphan + Linezolid/SSRIs/Tramadol), respiratory depression & hallucinations in DXM abuse/overdose
- Monitor for severe hypersensitivity, organ toxicity, or dose-limiting adverse events.
9. Major Drug–Drug, Drug–Food & Drug–Herb Interactions
- Dextromethorphan is a CYP2D6 substrate & serotonin reuptake blocker: Linezolid, Escitalopram, Sertraline, Fluoxetine, Paroxetine, Duloxetine, and Tramadol increase Serotonin Syndrome risk; Fluoxetine/Paroxetine/Bupropion/Terbinafine/Amiodarone block CYP2D6 and increase DXM toxicity 10-fold! Check multi-ingredient syrups for Phenylephrine (avoid in HTN/IHD!) and Chlorpheniramine (avoid in elderly!)
10. Clinical Monitoring, Patient Counselling & Storage
Clinical & Laboratory Monitoring: Monitor clinical response, baseline renal/hepatic parameters, and relevant serum biomarkers.
Pharmacist Patient Counselling Points:
- Patient Counselling Checklist: COUNTER TRIAGE CHECK: (1) Ask: 'Is the cough completely dry, or are you bringing up phlegm?' (Never give DXM/Reswas for a wet phlegm cough!); (2) If a patient has high BP, heart disease, diabetes, prostate enlargement, or takes antidepressants (SSRIs) or Linezolid, avoid multi-ingredient 'DX' syrups containing Phenylephrine + CPM — prefer plain Levodropropizine (Reswas); (3) Any cough lasting >2 weeks in India requires a TB test
- Meal & Clock Timing Instruction: May be taken with or without food; take Levodropropizine between meals (Every 6–8 Hours PRN (especially at Bedtime to permit sleep))
- Missed Dose Protocol: PRN for dry cough
- Geriatric Dispensing Pearl: In older adults with dry cough, avoid CPM/Phenylephrine-containing DXM syrups (AGS Beers 2023); check if the dry cough is caused by an ACE Inhibitor (Ramipril/Enalapril)!
Storage, Stability & Dispensing Safeguards: Store below 25°C–30°C in original moisture- and light-resistant packaging out of reach of children. Available forms: Dextromethorphan Syrup: 10 mg or 15 mg per 5 mL; Lozenges: 5–10 mg. Levodropropizine Syrup: 30 mg/5 mL; Tablets: 60 mg
11. Visual Pharmacology & Mechanism Diagram (svg-v339-01-adme-12-step-journey)
12. Authoritative References, Regulatory Sources & Editorial Disclaimer
Primary Compendial & Guideline Reference: Indian Pharmacist Desk Reference — Professional Edition 2.7 (2026–27) • Ch 09 [9.17] (p. 122)
Official Verification Portals: Indian Pharmacopoeia Commission (IPC) & National Formulary of India (NFI) • Central Drugs Standard Control Organization (CDSCO) • Ministry of Health & Family Welfare — NLEM 2022 • NCBI Bookshelf / StatPearls Pharmacology Reference • DailyMed (US FDA Official Prescribing Reference)
Last Medically & Pharmaceutically Reviewed: 2026-11-10 • Verification Status: HANDBOOK_SOURCE_CONTENT
Educational & Clinical Disclaimer: This reference profile is published solely for pharmacy education, academic study, and professional clinical reference. It does not substitute for patient-specific clinical judgement, qualified specialist oncology/medical supervision, or official CDSCO/IP prescribing information. Never self-medicate with prescription, Schedule H/H1/X, NDPS, or oncology medicines.
13. Related Reference Monographs, Educational Guides & Visual Concept
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