Pharmacology: 15 things MOST LIKELY to be tested in NEET MDS 2026
The Philosophy
"Pharmacology is about balancing the mechanism with the side effect. Always know the antidote, the enzyme it blocks, and how it impacts dental treatment."
A targeted breakdown of the highest priority topics based on recent question patterns and examiner logic.
1. Pharmacokinetics (ADME)
High PriorityCore Focus
- Zero-order vs First-order kinetics
- Cytochrome P450 enzyme inducers vs inhibitors
- Bioavailability & First-pass metabolism
NEET MDS Logic
They love testing mathematical concepts of half-life and specific drug interactions. CYP inducers/inhibitors are an examiner favorite.
Framing: "Which of the following drugs follows zero-order kinetics of elimination?"
Past Question Patterns
- NEET MDS 2024: Drug exhibiting zero-order kinetics.
- NEET MDS 2022: Bioavailability of an intravenously administered drug is.
- INI-CET 2021: Example of a CYP450 enzyme inhibitor.
- NEET MDS 2020: Definition of therapeutic index.
2. Pharmacodynamics & Receptors
Core Focus
- Competitive vs Non-competitive antagonism
- Receptor types (G-protein, Ligand-gated, Kinase-linked)
- Agonist vs Partial Agonist
NEET MDS Logic
Focus on how antagonists shift the dose-response curve. Competitive shifts it to the right; non-competitive pushes the maximum efficacy down.
Framing: "In the presence of a competitive antagonist, the dose-response curve of an agonist shifts to the?"
Past Question Patterns
- NEET MDS 2023: Effect of competitive antagonist on Km and Vmax.
- NEET MDS 2021: Example of a partial agonist.
- AIIMS 2020: Most rapid acting receptor type.
- NEET MDS 2019: Definition of pharmacological tolerance.
3. Local Anesthetics (LA)
Core Focus
- Mechanism: Blockade of voltage-gated Na+ channels
- Amides vs Esters (Metabolism sites)
- Maximum safe doses (Lignocaine with/without adrenaline)
NEET MDS logic
The absolute highest yield topic for MDS. Know maximum doses by weight, signs of LA toxicity, and why adrenaline is added.
Framing: "What is the maximum safe dose of 2% Lignocaine with 1:100,000 epinephrine in a healthy adult?"
Past Question Patterns
- NEET MDS 2025: Max dose of Lignocaine with adrenaline.
- NEET MDS 2022: Which LA is an ester?.
- NEET MDS 2021: Reason for adding vasoconstrictor to LA.
- INI-CET 2020: LA acting predominantly as a vasoconstrictor.
4. Cholinergic & Anticholinergic Drugs
Core Focus
- Organophosphorus poisoning & Pralidoxime
- Atropine mechanism and side effects
- Pilocarpine uses in dentistry (Xerostomia)
NEET MDS Logic
Know the antidotes. Organophosphates cause DUMBELS (diarrhea, urination, miosis, bradycardia, emesis, acrimation and salivation). Atropine blocks muscarinic receptors.
Framing: "The drug of choice for stimulating salivary flow in radiation-induced xerostomia is?"
Past Question Patterns
- NEET MDS 2023: Drug used to manage radiation-induced xerostomia.
- NEET MDS 2020: Antidote for Organophosphorus poisoning.
- NEET MDS 2018: Side effect of Atropine.
- AIIMS 2019: Mechanism of action of Neostigmine.
5. Adrenergic Agonists & Antagonists
Core Focus
- Adrenaline use in anaphylaxis (Alpha & Beta effects)
- Alpha-blockers (Prazosin) vs Beta-blockers (Propranolol)
- Epinephrine Reversal (Dale's phenomenon)
NBEMS Perspective
Epinephrine is life-saving in anaphylaxis because it stabilizes mast cells and opens airways. Beware of non-selective beta-blockers interacting with LA.
Framing: "Drug of choice for anaphylactic shock is?"
Past Question Patterns
- NEET MDS 2024: Drug of choice for anaphylaxis.
- NEET MDS 2022: Phenomenon seen when adrenaline is given after an alpha-blocker.
- NEET MDS 2019: Contraindication for non-selective beta-blockers.
- INI-CET 2021: Receptor responsible for adrenaline-induced bronchodilation.
6. General Anesthetics & Sedation
Core Focus
- Nitrous Oxide (MAC value, Diffusion hypoxia)
- Propofol vs Ketamine (Dissociative anesthesia)
- Benzodiazepines (Midazolam, Flumazenil as antidote)
NEET MDS Logic
Nitrous is heavily tested for its low potency (high MAC) but high analgesic effect. Remember Flumazenil is the reversal agent for BZDs.
Framing: "Which anesthetic agent is known to cause 'dissociative anesthesia'?"
Past Question Patterns
- NEET MDS 2023: Reversal agent for Midazolam sedation.
- NEET MDS 2021: Agent causing dissociative anesthesia.
- NEET MDS 2020: Prevention of diffusion hypoxia post-N2O administration.
- AIIMS 2018: Intravenous anesthetic of choice for day-care surgery.
7. NSAIDs & Non-Opioid Analgesics
Core Focus
- COX-1 vs COX-2 selectivity (Celecoxib)
- Aspirin (Irreversible antiplatelet effect, Reye's syndrome)
- Paracetamol toxicity & N-acetylcysteine
NEET MDS Logic
Always distinguish between anti-inflammatory NSAIDs and Paracetamol (which lacks peripheral anti-inflammatory action). Know the GI and renal side effects.
Framing: "Which NSAID irreversibly inhibits the cyclooxygenase enzyme?"
Past Question Patterns
- NEET MDS 2024: Irreversible COX inhibitor.
- NEET MDS 2022: Antidote for Paracetamol poisoning.
- NEET MDS 2019: Selective COX-2 inhibitor.
- INI-CET 2020: Reason Aspirin is contraindicated in children with viral fever.
8. Opioid Analgesics
Core Focus
- Mu, Kappa, Delta receptors
- Morphine actions and contraindications (Head injury)
- Naloxone / Naltrexone
NEET MDS Logic
Pinpoint pupil, respiratory depression, and coma = Opioid triad. Naloxone is the emergency lifesaver.
Framing: "Which specific receptor is primarily responsible for the respiratory depression and euphoria caused by Morphine?"
Past Question Patterns
- NEET MDS 2023: Specific antidote for opioid overdose.
- NEET MDS 2021: Triad of opioid poisoning.
- NEET MDS 2018: Opioid with the highest potency.
- AIIMS 2019: Primary receptor mediating Morphine analgesia.
9. Beta-Lactam Antibiotics
Core Focus
- Penicillins (Mechanism: Cell wall synthesis inhibition)
- Amoxicillin + Clavulanic acid (Beta-lactamase inhibition)
- Cephalosporins generations
NEET MDS Logic
First-line drugs in dentistry. Understand why Clavulanic acid is added (it has no antibacterial activity itself, it just protects the Amoxicillin).
Framing: "The role of Clavulanic acid in Augmentin is to?"
Past Question Patterns
- NEET MDS 2024: Mechanism of action of Clavulanic acid.
- NEET MDS 2022: Antibiotic of choice for standard endocarditis prophylaxis in non-allergic patient.
- NEET MDS 2020: Mechanism of action of Penicillin.
- INI-CET 2021: Cross-reactivity percentage between penicillins and cephalosporins.
10. Tetracyclines & Macrolides
Core Focus
- Tetracycline side effects (Tooth staining, bone affinity)
- Macrolides (Azithromycin as Penicillin alternative)
- Mechanism: Protein synthesis inhibition (30S vs 50S)
NEET MDS Logic
Tetracyclines bind to calcium (chelators) causing intrinsic staining; contraindicated in pregnancy and kids under 8.
Framing: "Which antibiotic is contraindicated during pregnancy due to its risk of causing fetal tooth discoloration?"
Past Question Patterns
- NEET MDS 2023: Cause of intrinsic staining of teeth in children.
- NEET MDS 2021: Alternative antibiotic for endocarditis prophylaxis in Penicillin-allergic patients.
- NEET MDS 2019: Tetracycline acts by binding to which ribosomal subunit?
- AIIMS 2020: Antibiotic causing pseudomembranous colitis most frequently.
11. Antihypertensives & Dental Implications
Core Focus
- Calcium Channel Blockers (Gingival Hyperplasia - Amlodipine)
- ACE Inhibitors (Dry cough - Enalapril)
- Diuretics (Thiazides causing hypokalemia)
NEET MDS Logic
Systemic drugs with direct oral manifestations are heavily tested. CCBs, Phenytoin, and Cyclosporine all cause gingival overgrowth.
Framing: "A patient presents with gingival overgrowth. Which of the following antihypertensive medications is likely responsible?"
Past Question Patterns
- NEET MDS 2025: Antihypertensive causing gingival enlargement.
- NEET MDS 2022: Common side effect of ACE inhibitors.
- NEET MDS 2020: Mechanism of ACE inhibitor induced cough.
- INI-CET 2019: First-line antihypertensive in pregnancy.
12. Anticoagulants & Antiplatelets
Core Focus
- Warfarin (Mechanism, Vitamin K antagonist, INR monitoring)
- Heparin (Mechanism, Protamine sulfate as antidote)
- Clopidogrel & Aspirin
NEET MDS Logic
Crucial for oral surgery extraction planning. Warfarin needs INR ideally between 2.0-3.0 for safe extractions. Know the antidotes.
Framing: "The specific antidote for Heparin overdose is?"
Past Question Patterns
- NEET MDS 2024: Antidote for Heparin.
- NEET MDS 2021: Target INR for safe minor oral surgery in a patient on Warfarin.
- NEET MDS 2019: Mechanism of action of Clopidogrel.
- AIIMS 2018: Antidote for Warfarin toxicity.
13. Corticosteroids
Core Focus
- Anti-inflammatory & Immunosuppressive mechanisms
- Adrenal crisis & Rule of Twos
- Side effects (Osteoporosis, candidiasis, delayed healing)
NEET MDS Logic
Steroids inhibit Phospholipase A2. They are used for lichen planus, pemphigus, etc. Systemic abrupt withdrawal causes Adrenal Crisis.
Framing: "Sudden withdrawal of long-term systemic corticosteroid therapy can lead to?"
Past Question Patterns
- NEET MDS 2023: Condition precipitated by abrupt withdrawal of steroids.
- NEET MDS 2020: Enzyme inhibited by corticosteroids to stop inflammation.
- NEET MDS 2018: Common oral side effect of inhaled corticosteroids.
- INI-CET 2022: Drug of choice for acute adrenal crisis.
14. Antidiabetics
Core Focus
- Insulin (Short-acting vs Long-acting)
- Metformin (Mechanism: Decreases hepatic gluconeogenesis)
- Management of hypoglycemic emergency in dental chair
NEET MDS Logic
Hypoglycemia is the most common medical emergency in a dental clinic. Know how to manage it (Oral glucose if conscious, IV Dextrose/Glucagon if unconscious).
Framing: "The first line oral hypoglycemic agent for Type 2 Diabetes Mellitus is?"
Past Question Patterns
- NEET MDS 2024: First-line drug for Type 2 DM.
- NEET MDS 2021: Management of an unconscious hypoglycemic patient in the dental clinic.
- NEET MDS 2019: Mechanism of action of Sulfonylureas.
- AIIMS 2020: Most common side effect of Insulin therapy.
15. Emergency Medical Drugs
Core Focus
- Nitroglycerin (Angina, sublingual)
- Salbutamol/Albuterol (Asthma, beta-2 agonist)
- Epinephrine (Anaphylaxis)
NEET MDS Logic
Every dentist must know the crash cart. Nitroglycerin causes vasodilation but beware of severe headache or hypotension.
Framing: "Which drug is administered sublingually for the immediate relief of an acute angina attack?"
Past Question Patterns
- NEET MDS 2025: Route of administration of Nitroglycerin in acute angina.
- NEET MDS 2022: Drug of choice for acute severe asthma attack.
- NEET MDS 2020: Drug contraindicated in a patient taking Sild.
- INI-CET 2019: Emergency drug for status epilepticus.
Topper Logic
Whenever you study a systemic drug, ask yourself: "Does this cause gingival hyperplasia, xerostomia, bleeding, or interact with Local Anesthesia?" That's where the MDS questions live.
Updated Mar 24, 2026.
