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🎯 MBBS Pharmacology - HIGH YIELD TOPIC MAP

Based on 30-Year PYQ Analysis | Exam Pattern: 1×10 + 14×5 + 5×3 + 20 MCQ = 100 Marks

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📋 EXAM PATTERN BREAKDOWN

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🔥 TIER 1 - GUARANTEED QUESTIONS (Almost every year for 30 years)

1. AUTONOMIC NERVOUS SYSTEM (PH1.13 + PH1.14)

• Classification:
  • Direct: Adrenaline, NA, Isoprenaline, Dopamine, Dobutamine, Salbutamol
  • Indirect: Amphetamine, Tyramine
  • Mixed: Ephedrine
• Drug of choice: Adrenaline in anaphylactic shock (0.5 mg IM)
• Alpha blockers: Prazosin (selective α1) - DOC: BPH, hypertensive emergencies
• Beta blockers: Propranolol (non-selective) - contraindicated in asthma
• Specific treatment: Phentolamine for noradrenaline extravasation

• Organophosphate poisoning - ATROPINE 2-4 mg IV + PRALIDOXIME (2-PAM) within 24 hrs
• Myasthenia Gravis - Neostigmine/Pyridostigmine (DOC)
• Glaucoma - Pilocarpine (cholinergic), Timolol (beta blocker)

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2. CNS DRUGS - MOST ASKED CATEGORY (PH1.19)

• Classification: Phenytoin, Valproate, Carbamazepine, Ethosuximide, Benzodiazepines, newer (Gabapentin, Levetiracetam, Lamotrigine)
• DOC - Status epilepticus: IV Lorazepam → Phenytoin/Fosphenytoin → Phenobarbital → General anesthesia
• DOC - Absence seizures: Ethosuximide (first choice), Valproate (if mixed)
• DOC - Tonic-clonic: Valproate / Phenytoin
• Phenytoin side effects: Gingival hyperplasia, hirsutism, folate deficiency, zero-order kinetics (important MCQ!)

• Morphine MOA: μ-receptor agonist
• Acute morphine poisoning triad: Pin-point pupils + respiratory depression + coma
• Antidote: Naloxone 0.4 mg IV (repeat every 2-3 min)
• DOC cancer pain: WHO ladder - Morphine
• Buprenorphine: Partial agonist, DOC in opioid deaddiction

• Classification: Typical (Chlorpromazine, Haloperidol) vs Atypical (Clozapine, Risperidone, Olanzapine)
• Clozapine: DOC treatment-resistant schizophrenia, side effect = agranulocytosis (monitor WBC)
• NMS (Neuroleptic Malignant Syndrome): Hyperthermia + rigidity + autonomic instability → Stop drug, Bromocriptine + Dantrolene

• Classification: TCA (Amitriptyline), SSRI (Fluoxetine), SNRI (Venlafaxine), MAOI (Phenelzine), Atypical (Mirtazapine)
• DOC MDD: SSRIs (first-line)
• TCA overdose: Sodium bicarbonate (for cardiac arrhythmia)
• Lithium: DOC bipolar disorder maintenance, narrow TI, toxicity = tremor + polyuria → monitor serum levels

• Benzodiazepines: Diazepam, Alprazolam - GABA-A receptor
• Antidote for BZD overdose: Flumazenil
• Barbiturate overdose: Supportive - no specific antidote

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3. CARDIOVASCULAR DRUGS (PH1.27 + PH1.28 + PH1.29 + PH1.30)

• Diuretics: Thiazides (hydrochlorothiazide) - first line HTN
• Beta blockers: Atenolol, Metoprolol
• CCBs: Amlodipine (dihydropyridine - peripheral), Verapamil (non-DHP - cardiac)
• ACE inhibitors: Enalapril, Ramipril - side effect = dry cough (bradykinin)
• ARBs: Losartan - no cough, DOC when ACE-I intolerance
• Alpha blockers: Prazosin

• HTN in pregnancy: Methyldopa (safest), Labetalol, Nifedipine
• HTN emergency: Sodium nitroprusside (IV)
• Hypertensive urgency: Oral Labetalol / Nifedipine

• Stable angina: Nitrates + Beta blocker + CCB
• Unstable angina: Aspirin + Heparin + Nitrates + Beta blocker
• MI treatment: MONA - Morphine, Oxygen, Nitrates, Aspirin + add Heparin, thrombolytics (Streptokinase, tPA)
• Nitrate mechanism: NO → guanylyl cyclase → cGMP → venodilation (preload reduction)

• ACE inhibitors (reduce mortality - first choice)
• Beta blockers: Carvedilol, Bisoprolol
• Diuretics: Furosemide (symptom relief)
• Digoxin: + inotrope, narrow TI, toxicity = yellow vision, arrhythmia → treat with Digibind

• Class I: Na channel blockers (Lignocaine = Class Ib, DOC VT)
• Class II: Beta blockers
• Class III: Amiodarone - DOC most arrhythmias, side effects = thyroid, lung, corneal deposits
• Class IV: Verapamil - DOC SVT

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4. ANTIMICROBIALS (Always high yield - not in image but standard syllabus PH1.39-1.42)

• MOA: Inhibit cell wall synthesis (transpeptidase / PBP)
• Side effect: Allergy - anaphylaxis - test sensitivity first
• DOC: Streptococcal pharyngitis = Penicillin G

• Ototoxicity + nephrotoxicity (key MCQ)
• DOC: Tuberculosis (Streptomycin - 2nd line)

• MOA: Inhibit DNA gyrase (topoisomerase II)
• Avoid in children and pregnancy (cartilage damage)

• MOA: 30S ribosome inhibition
• Avoid in < 8 years (teeth staining), pregnancy

• Rifampicin: Enzyme inducer, red urine, hepatotoxic
• Isoniazid: Peripheral neuropathy (give pyridoxine B6)
• Pyrazinamide: Hyperuricemia, hepatotoxic
• Ethambutol: Optic neuritis (retrobulbar)
• DOC TB meningitis: 2HRZE + 4HR (prolonged steroids added)

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5. NSAIDs & AUTACOIDS (PH1.16)

• Non-selective COX inhibitors: Aspirin, Ibuprofen, Diclofenac
• Selective COX-2: Celecoxib (less GI toxicity, more CV risk)

• Low dose: Antiplatelet (DOC TIA, MI prophylaxis) - 75-150 mg
• Moderate dose: Antipyretic/analgesic
• High dose: Anti-inflammatory
• Overdose: Salicylism → mixed respiratory alkalosis + metabolic acidosis
• Reye's syndrome: Avoid in children with viral fever

• Acute: Colchicine / NSAIDs / Steroids
• Chronic: Allopurinol (xanthine oxidase inhibitor - DOC chronic gout)
• Febuxostat: Alternative to allopurinol

• H1 blockers: 1st gen (sedating - Chlorpheniramine, Promethazine), 2nd gen (non-sedating - Cetirizine, Loratadine)
• DOC anaphylaxis: IV Chlorpheniramine (+ adrenaline + steroids)

• Sumatriptan: DOC acute migraine (5-HT1B/1D agonist)
• Ondansetron: 5-HT3 antagonist - antiemetic

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6. DIURETICS (PH1.24)

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7. ANTICOAGULANTS (PH1.25)

• Heparin: Immediate action, parenteral, antidote = Protamine sulfate
• Warfarin: Oral, Vit K antagonist, antidote = Vit K / FFP, teratogenic
• Low-mol Heparin (LMWH): Enoxaparin - anti-Xa, no monitoring needed
• DOACs: Dabigatran (antidote Idarucizumab), Rivaroxaban (antidote Andexanet alfa)
• Thrombolytics: Streptokinase, tPA - DOC acute MI/PE (within time window)
• Antiplatelet DOC: Aspirin ± Clopidogrel (ACS)

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8. LOCAL & GENERAL ANAESTHETICS (PH1.17 + PH1.18)

• MOA: Block Na channels, prevent depolarization
• Esters: Cocaine, Procaine, Benzocaine
• Amides: Lignocaine (DOC), Bupivacaine, Ropivacaine
• Adrenaline added to LA: Prolongs action, reduces systemic toxicity, produces vasoconstriction
• Lignocaine toxicity: CNS (convulsions) → CVS collapse

• Inhalational: Halothane (hepatotoxic, malignant hyperthermia), Sevoflurane (safest), Isoflurane
• IV: Thiopentone (ultra-short acting, DOC induction), Ketamine (dissociative, DOC in burns/asthma), Propofol (TIVA)
• Premedication: Atropine (antisecretory), Midazolam (anxiolytic), Morphine (analgesic)

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9. PHARMACOKINETICS (PH1.4 + PH1.5)

• Zero-order kinetics: Fixed amount eliminated = Phenytoin, Aspirin (high dose), Alcohol, Warfarin (mnemonic: PAAW)
• First-pass metabolism: Lignocaine, Morphine, Propranolol, GTN - all given by non-oral routes
• Volume of distribution: Large Vd = lipid soluble, distributes widely
• Half-life and steady state: Reached in 4-5 half-lives
• Bioavailability: % reaching systemic circulation
• Therapeutic index: LD50/ED50 - narrow TI drugs: Digoxin, Lithium, Phenytoin, Warfarin, Aminoglycosides

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10. DRUGS OF ABUSE + POISONING (PH1.20 + PH1.21 + PH1.22)

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📊 PREDICTED QUESTION DISTRIBUTION FOR YOUR EXAM

🔴 10-MARKER (Most Likely Topics - Choose 1):

1. Antiepileptic drugs - classification, MOA, uses, side effects (asked almost every year)
2. Antihypertensive drugs - full classification with DOC
3. Antimicrobials - classification and uses
4. Morphine - pharmacology + poisoning treatment

🟠 5-MARKER SHORT ESSAYS (Pick ~14 topics to prepare):

1. Organophosphate poisoning and treatment
2. Beta blockers - classification, uses, contraindications
3. Diuretics - classification and clinical uses
4. ACE inhibitors vs ARBs
5. Benzodiazepines - uses and overdose treatment
6. Heparin vs Warfarin
7. Local anaesthetics - classification and uses of adrenaline
8. Lithium in bipolar disorder
9. Antiplatelet drugs
10. Antidote chart (DOC for various poisonings)
11. Ketamine - pharmacology
12. Digoxin - uses, toxicity, treatment
13. Sumatriptan in migraine
14. NSAIDs - classification, aspirin in low dose

🟡 3-MARKER SHORT NOTES (5 topics):

1. Zero-order kinetics with examples
2. Flumazenil (BZD antidote)
3. Naloxone uses
4. Gynecomastia-causing drugs
5. Drugs contraindicated in pregnancy

🟢 MCQ HOT TOPICS:

• Drug causing gingival hyperplasia = Phenytoin
• DOC status epilepticus = Lorazepam IV
• Antidote for Heparin = Protamine sulfate
• Antidote for Warfarin = Vitamin K
• Drug with zero-order kinetics = Phenytoin / Ethanol
• DOC absence seizures = Ethosuximide
• Clozapine unique side effect = Agranulocytosis
• Sumatriptan class = 5-HT1B/1D agonist
• Ototoxic diuretic = Furosemide
• Red-orange urine = Rifampicin

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🗺️ HIGH YIELD TOPIC MAP - PRIORITY TIERS

⭐⭐⭐ MUST PREPARE (30-year consistent)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
CNS drugs (antiepileptics, opioids, antipsychotics)
Cardiovascular drugs (antihypertensives, antianginals, HF)
Autonomic drugs (adrenergic, cholinergic, poisoning)
Antimicrobials (including antitubercular)
Anticoagulants & Antiplatelets

⭐⭐ HIGH YIELD (Most years)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
NSAIDs / Autacoids / Antihistamines / Migraine
Diuretics
Local & General Anaesthetics
Pharmacokinetics (MCQs)
Drug poisoning & antidotes

⭐ IMPORTANT (Occasional)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Skeletal muscle relaxants (Pancuronium, Succinylcholine)
Drugs in renal failure (dose adjustments)
Adverse drug reactions
Drug prescriptions & interactions

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✅ QUICK SCORE STRATEGY (to get above 80/100)

1. Nail the 10-marker - Antiepileptics or Antihypertensives = 10 marks secured
2. Prepare 16 short essays (buffer 2 extra) from Tier 1 topics = 70 marks
3. Memorize antidotes chart = answers 2-3 short notes + 5+ MCQs
4. Classifications - Write them first in every answer, examiners love organized tables
5. Drug of choice - Memorize DOC for every condition, it scores in MCQs and short notes
6. MCQs - Focus on: zero-order kinetics drugs, antidotes, specific side effects (unique to one drug), contraindications

Pro tip: For every drug class, learn the classification + 1 prototype drug in full detail (MOA, dose, uses, side effects, contraindications, DOC status). This covers 80% of all possible questions from that topic.