1. Clinical & Scientific Overview
Etophylline + Theophylline (Deriphyllin 77:23 FDC) (TIP-MED-000356, Reference Code [9.8]-C86) is classified under
Respiratory, Asthma, COPD & Allergy Medicines (Ch 09) as a Methylxanthine Bronchodilator & Respiratory Stimulant (Non-Selective Phosphodiesterase [PDE] Inhibitor & Adenosine Receptor Antagonist).
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).
Co-indexed constituent under primary monograph [9.8] (Theophylline & Etophylline + Theophylline [Deriphyllin] (Methylxanthine Bronchodilators)). Representative Indian Market Examples (Edition 2.7 Ch 09 [9.8], p. 117): • Sustained-Release Theophylline: Unicontin-E 400 (Modi Mundipharma), Theo-Asthalin, Theo-PA. • Etophylline + Theophylline (77:23 ratio): Deriphyllin / Deriphyllin Retard 150 mg, 300 mg (Zydus). • Doxofylline (Next-gen xanthine with fewer cardiac/CNS side effects): Doxolin / Doxovent 400 mg (Glenmark/Alkem). • Acebrophylline (Ambroxol + Theophylline-7-acetate): AB-Phylline 100 mg BD / 200 mg SR (Sun Pharma), Macphylline — Strengths & Dosage Forms: Theophylline SR Tablets: 200 mg, 300 mg, 400 mg, 600 mg; Deriphyllin Tablets: 100 mg (IR), 150 mg Retard, 300 mg Retard & Injection (2 mL); Doxofylline Tablets: 400 mg, 650 mg SR; Acebrophylline Capsules/Tablets: 100 mg, 200 mg SR
Theophylline SR Tablets: 200 mg, 300 mg, 400 mg, 600 mg; Deriphyllin Tablets: 100 mg (IR), 150 mg Retard, 300 mg Retard & Injection (2 mL); Doxofylline Tablets: 400 mg, 650 mg SR; Acebrophylline Capsules/Tablets: 100 mg, 200 mg SR
3. Mechanism of Action & Pharmacodynamics
Methylxanthine Bronchodilator & Respiratory Stimulant (Non-Selective Phosphodiesterase [PDE] Inhibitor & Adenosine Receptor Antagonist) acting on target receptor/enzyme pathways in Respiratory, Asthma, COPD & Allergy Medicines (Ch 09): clinical efficacy is mediated via Methylxanthine Bronchodilator & Respiratory Stimulant (Non-Selective Phosphodiesterase [PDE] Inhibitor & Adenosine Receptor Antagonist) for Third-line oral add-on therapy in COPD and Bronchial Asthma when inhaled LAMA + LABA + ICS therapy is insufficient or unaffordable..
4. Therapeutic Indications & Evidence-Supported Uses
- Third-line oral add-on therapy in COPD and Bronchial Asthma when inhaled LAMA + LABA + ICS therapy is insufficient or unaffordable
🇮🇳 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: General Adult Reference: NARROW THERAPEUTIC INDEX (for Theophylline/Deriphyllin: therapeutic serum window is strictly 5–15 mcg/mL; toxicity occurs >20 mcg/mL)! • Deriphyllin Retard: 150 mg to 300 mg once or twice daily. • Unicontin-E (Theophylline SR): 200 mg–400 mg once or twice daily. • Doxofylline: 400 mg twice daily (or once daily at bedtime). • Acebrophylline: 100 mg twice daily after meals (or 200 mg SR OD). Follow physician prescription.
Administration & Meal Timing: Take after meals with water to reduce gastric acid reflux and nausea. Swallow Retard / SR tablets whole—never crush or chew! | Morning and evening after meals, or evening/bedtime for nocturnal bronchospasm.
6. Pharmacokinetics, Metabolism & Renal/Hepatic Adjustment
Follows class pharmacokinetic profile detailed in parent monograph [9.8].
Renal: ~10% excreted unchanged in adults (safe in mild-to-moderate CKD, though monitor in severe CKD). Hepatic & Cardiac: Clearance drops by 50% in Hepatic Cirrhosis, Congestive Heart Failure (hepatic congestion), Cor Pulmonale, Pneumonia, and Acute Viral Fever! Must reduce dose by 50% in cirrhosis or heart failure!
Renal: ~10% excreted unchanged in adults (safe in mild-to-moderate CKD, though monitor in severe CKD). Hepatic & Cardiac: Clearance drops by 50% in Hepatic Cirrhosis, Congestive Heart Failure (hepatic congestion), Cor Pulmonale, Pneumonia, and Acute Viral Fever! Must reduce dose by 50% in cirrhosis or heart failure!
Renal: ~10% excreted unchanged in adults (safe in mild-to-moderate CKD, though monitor in severe CKD). Hepatic & Cardiac: Clearance drops by 50% in Hepatic Cirrhosis, Congestive Heart Failure (hepatic congestion), Cor Pulmonale, Pneumonia, and Acute Viral Fever! Must reduce dose by 50% in cirrhosis or heart failure!
7. Contraindications, Precautions & High-Risk Warnings
- Contraindicated in active peptic ulcer disease (relaxes lower oesophageal sphincter and stimulates gastric acid secretion!), uncontrolled tachyarrhythmias (atrial fibrillation, multifocal atrial tachycardia), acute myocardial infarction, hyperthyroidism, and uncontrolled epilepsy/seizure disorders.
Key Clinical Precautions: Renal: ~10% excreted unchanged in adults (safe in mild-to-moderate CKD, though monitor in severe CKD). Hepatic & Cardiac: Clearance drops by 50% in Hepatic Cirrhosis, Congestive Heart Failure (hepatic congestion), Cor Pulmonale, Pneumonia, and Acute Viral Fever! Must reduce dose by 50% in cirrhosis or heart failure!
8. Adverse Effects Profile
- Sinus tachycardia and palpitations, restlessness, insomnia, fine hand tremor, nausea, gastro-oesophageal acid reflux (GERD), headache, diuresis (Doxofylline and Acebrophylline have lower adenosine-A1 receptor affinity and cause fewer cardiac/CNS side effects than classic Theophylline/Deriphyllin).
- Theophylline Toxicity (Serum level >20 mcg/mL): Intractable vomiting, severe hypokalaemia, hyperglycaemia, supraventricular and fatal ventricular tachyarrhythmias (multifocal atrial tachycardia, ventricular fibrillation), and refractory generalised tonic-clonic seizures (which can occur WITHOUT warning nausea in elderly patients!).
9. Major Drug–Drug, Drug–Food & Drug–Herb Interactions
- MASSIVE CYP1A2 & CYP3A4 INTERACTION PROFILE (Clearance is easily blocked!): • Drugs that DOUBLE Theophylline levels & trigger fatal seizures/arrhythmias: Ciprofloxacin, Norfloxacin, Erythromycin, Clarithromycin, Fluvoxamine, Cimetidine, Allopurinol (high dose), Verapamil, Diltiazem, and Propranolol! (NEVER prescribe Ciprofloxacin or Clarithromycin to an elderly COPD patient taking Deriphyllin/Theophylline without stopping or cutting the xanthine dose by 50%!)
- • Drugs/Factors that DECREASE Theophylline levels: Tobacco smoking (induces CYP1A2—smokers clear theophylline twice as fast, and stopping smoking causes sudden toxicity!), Rifampicin, Phenytoin, Carbamazepine
- • Hypokalaemia synergy: Salbutamol + Steroids + Furosemide + Theophylline causes severe hypokalaemia
10. Clinical Monitoring, Patient Counselling & Storage
Clinical & Laboratory Monitoring: Monitor clinical parameters per parent monograph [9.8].
Pharmacist Patient Counselling Points:
- Patient Counselling Checklist: Deriphyllin Retard is dispensed in huge quantities in CGHS dispensaries: 1. Swallow Retard tablets whole after meals. 2. Cut down on strong tea and coffee. 3. Critical Antibiotic Warning: Tell the patient that if any doctor prescribes an antibiotic for a chest or urine infection (especially Ciprofloxacin [Ciplox] or Clarithromycin), they must remind the doctor they are taking Deriphyllin/Unicontin, because Ciprofloxacin blocks its breakdown and causes dangerous heart racing and fits! 4. Report persistent nausea, vomiting, racing heartbeat, or inability to sleep immediately.
- Meal & Clock Timing Instruction: Take after meals with water to reduce gastric acid reflux and nausea. Swallow Retard / SR tablets whole—never crush or chew! (Morning and evening after meals, or evening/bedtime for nocturnal bronchospasm.)
- Missed Dose Protocol: Take as soon as remembered unless within 6 hours of next scheduled dose; never double a Retard tablet.
- Geriatric Dispensing Pearl: Hepatic CYP1A2 clearance of theophylline is 30% lower in elderly patients, and frequently drops further during acute COPD pneumonia or right heart failure. When an oral xanthine is desired in an elderly patient, Doxofylline (400 mg) or Acebrophylline (100 mg) has a wider safety margin and far fewer CYP1A2 antibiotic interactions than classic Theophylline/Deriphyllin.
Storage, Stability & Dispensing Safeguards: Store below 25°C–30°C in original moisture- and light-resistant packaging out of reach of children. Available forms: Theophylline SR Tablets: 200 mg, 300 mg, 400 mg, 600 mg; Deriphyllin Tablets: 100 mg (IR), 150 mg Retard, 300 mg Retard & Injection (2 mL); Doxofylline Tablets: 400 mg, 650 mg SR; Acebrophylline Capsules/Tablets: 100 mg, 200 mg SR
11. Visual Pharmacology & Mechanism Diagram (svg-v339-01-adme-12-step-journey)
12. Authoritative References, Regulatory Sources & Editorial Disclaimer
Primary Compendial & Guideline Reference: Indian Pharmacopoeia (IP 2022) • NFI • CDSCO
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: VERIFIED_EDUCATIONAL_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
💊 Related Pharmacological / Category Profiles
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- [9.7] Montelukast Sodium — Selective Cysteinyl Leukotriene (CysLT1) Receptor Antagonist (Ora
- [9.8] Theophylline & Etophylline + Theophylline [Deriphyllin] (Methylxanthine Bronchodilators) — Methylxanthine Bronchodilator & Respiratory Stimulant (Non-Select
- [9.9] Levocetirizine, Cetirizine & Chlorpheniramine Maleate (Oral H1 Antihistamines) — Histamine H1-Receptor Inverse Agonists (Second-Generation Non-Sed
