Clinical pharmacology is about 4.5% of NRE Step I, roughly 9 of 200 items; PM&DC's table shows 8 in its legible rows and we scale the basic-science rows to 60 items. The syllabus covers general pharmacology, autacoids, systemic drug classes, chemotherapy, and drugs in pregnancy, children, the elderly and organ failure. Stems ask for a drug of choice, an adverse effect, an interaction or a dose adjustment in a clinical case. The Pakistan-specific layer is the national TB, malaria and hepatitis therapy, the DRAP regulatory framework and the essential medicines concept.
Weight and expected item count
About nine items, or nine minutes of paper time. Pharmacology is also embedded inside medicine, surgery, obstetrics and paediatrics stems, where the question asks for a treatment. A candidate who knows first-line drugs, their key adverse effects and the main contraindications will gain marks in all of those domains, not only here.
What is tested
| Block | Topics |
|---|---|
| General principles | Pharmacokinetics (absorption, distribution, metabolism, excretion); pharmacodynamics, receptors and dose-response; adverse drug reactions and interactions |
| Autonomic and cardiovascular | Cholinergic and adrenergic drugs; antihypertensives, antiarrhythmics, antianginals, anticoagulants; diuretics and renal pharmacology |
| Respiratory and endocrine | Asthma and COPD drugs; insulin, oral hypoglycaemics, thyroid drugs, steroids |
| Antimicrobials | Beta-lactams, macrolides, quinolones, aminoglycosides; anti-tubercular and anti-leprosy drugs; antimalarials and antiprotozoals; antivirals including hepatitis B and C therapies and antiretrovirals; antifungals and antihelminthics |
| Oncology and immunosuppression | Cancer chemotherapy and immunosuppressants |
| CNS and analgesia | Antiepileptics, antipsychotics, antidepressants, anaesthetics; analgesics, NSAIDs and opioids |
| Special populations and regulation | Drugs in pregnancy, lactation, children and the elderly; drug regulation in Pakistan (DRAP) and essential medicines |
Local guideline points
- Anti-TB drugs: 2HRZE then 4HR; isoniazid with pyridoxine; rifampicin as a potent enzyme inducer; ethambutol and optic neuritis; pyrazinamide and hyperuricaemia; know the drug behind each adverse effect.
- Antimalarials: artemether-lumefantrine for uncomplicated falciparum, chloroquine plus primaquine for vivax after G6PD testing, intravenous artesunate for severe malaria.
- Typhoid: in XDR disease azithromycin or a carbapenem replace fluoroquinolones and third-generation cephalosporins.
- Hepatitis C: direct-acting antivirals have replaced interferon; use WHO guidance for regimens.
- Dengue: paracetamol only; NSAIDs and aspirin are avoided.
- Obstetric drugs: oxytocin 10 IU IM for PPH prophylaxis, tranexamic acid 1 g IV, magnesium sulphate for eclampsia.
- DRAP: the Drug Regulatory Authority of Pakistan, established under the DRAP Act 2012, registers drugs, regulates prices and runs pharmacovigilance. The National Essential Medicines List guides the public-sector formulary.
Sources and supporting detail are in local guidelines.
Three typical traps
- Choosing the drug and ignoring the patient. The right drug may be wrong because of pregnancy, renal failure, G6PD deficiency, an interacting drug or an allergy. Read the patient details before the options.
- Confusing adverse-effect pairs. Isoniazid and neuropathy, rifampicin and orange secretions and induction, ethambutol and optic neuritis, aminoglycosides and ototoxicity or nephrotoxicity, amiodarone and thyroid or pulmonary toxicity. Build a drug-to-effect table and test it both ways.
- Misapplying kinetics. Half-life, steady state, loading dose and clearance questions are calculation-light but concept-heavy. Know that steady state takes about four to five half-lives, and which drugs follow zero-order kinetics, such as phenytoin at high doses and alcohol.
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How to revise it
| Session | Do this |
|---|---|
| 1 | Pharmacokinetics and dynamics with five worked examples; adverse reactions and interactions (enzyme inducers and inhibitors) |
| 2 | Autonomic and cardiovascular drugs by class: mechanism, use, adverse effect, contraindication |
| 3 | Antimicrobials: spectrum, adverse effects, resistance; then TB, malaria and antiviral drugs |
| 4 | Endocrine, respiratory, CNS and analgesic drugs |
| 5 | Cancer drugs and immunosuppressants; special populations; DRAP and essential medicines |
| 6 | Mixed block of 40 with a drug-effect table review |
Always learn a drug as a group: class, mechanism, use, adverse effect, interaction. The study plan places pharmacology next to pathology so that antimicrobials and organisms are revised together.
Core facts to state without notes
- Enzyme inducers: rifampicin, phenytoin, carbamazepine, phenobarbital and chronic alcohol lower the levels of warfarin, oral contraceptives and many other drugs.
- Enzyme inhibitors: erythromycin and clarithromycin, azole antifungals, cimetidine and grapefruit juice raise the levels of drugs cleared by the same enzymes.
- Unsafe in pregnancy: ACE inhibitors and ARBs, warfarin, tetracyclines, valproate and isotretinoin, among others. Check every option against pregnancy.
- Antidotes: N-acetylcysteine for paracetamol, naloxone for opioids, flumazenil for benzodiazepines, protamine for heparin, vitamin K for warfarin, atropine and pralidoxime for organophosphates.
- Metformin: contraindicated in significant renal impairment because of the risk of lactic acidosis.
- Aminoglycosides: nephrotoxicity and ototoxicity; levels and renal function are monitored.
- Digoxin and lithium: narrow therapeutic index; toxicity is worsened by hypokalaemia (digoxin) and dehydration or diuretics (lithium).
Reading a pharmacology stem
A pharmacology stem usually hides one decisive fact: a second drug the patient takes, an organ that is failing, a pregnancy, an allergy or a genetic trait. Before reading the options, list those facts in the stem. Then ask whether the question wants a mechanism, a first-line choice, an adverse effect or an interaction, and eliminate options that fail the decisive fact. If two drugs remain, choose the one that is first-line in the guideline you studied for Pakistan, not the one you used abroad.
| Can you say, in one sentence each... | Mark |
|---|---|
| The main adverse effect and monitoring for each first-line TB drug | red, amber or green |
| Which drugs induce and which inhibit hepatic enzymes | red, amber or green |
| Five drugs to avoid in pregnancy and why | red, amber or green |
| The antidote for each of six common poisonings | red, amber or green |
Links to other domains
Pharmacology pairs with pathology (organisms), medicine (treatment decisions), obstetrics (drugs in pregnancy) and toxicology (antidotes).
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Frequently asked questions
How many pharmacology questions are in NRE Step I?
PM&DC's table shows 8 in its legible rows; with the basic-science rows scaled to 60 items we estimate about 9. Treat 8 to 9 as the range.
Does the NRE test drug doses?
PM&DC describes the items as aimed at higher cognition. Expect drug of choice, adverse effects, interactions and use in special populations more than exact doses, though a few critical doses such as oxytocin 10 IU for PPH prophylaxis are worth knowing.
Which drug groups should I prioritise?
Antimicrobials (especially anti-TB and antimalarial drugs), cardiovascular drugs, endocrine drugs, CNS drugs, and drugs in pregnancy and special populations.
What is DRAP?
The Drug Regulatory Authority of Pakistan, established under the DRAP Act 2012. It registers drugs, regulates prices and runs pharmacovigilance. The National Essential Medicines List guides the public-sector formulary.
How do I learn adverse effects efficiently?
Build a two-way table: drug to adverse effect and adverse effect to drug. Test both directions, because stems usually describe the effect and ask for the drug.