Pharmacology is the single biggest scorer in Pakistani pharmacist papers and sits under almost every Gulf clinical question. These notes pull out the class-by-class facts examiners return to most.
How this book helps in the exam
- Mechanism questions: which receptor, enzyme or channel a drug acts on.
- Signature adverse effects and the drug that causes them.
- Contraindications, interactions and the drug of choice for a named condition.
- In Gulf exams, the same facts appear inside patient cases rather than as direct recall.
What the book covers
13 high-yield topics. Each has the points most often examined and links to practise them.
1Autonomic pharmacology
- Muscarinic agonists slow the heart, constrict pupils and increase secretions; atropine reverses all of these.
- Beta-1 selective blockers (atenolol, bisoprolol, metoprolol) are preferred in asthma and COPD, but selectivity is lost at high doses.
- Alpha-1 blockers (prazosin, tamsulosin) cause first-dose postural hypotension; tamsulosin is uroselective for BPH.
- Neostigmine reverses non-depolarising blockers; sugammadex binds rocuronium and vecuronium directly.
2Antihypertensives
- ACE inhibitors cause dry cough (bradykinin) and angioedema; ARBs do not cause the cough.
- ACE inhibitors and ARBs are contraindicated in pregnancy and can raise potassium and creatinine.
- Dihydropyridine calcium channel blockers (amlodipine) cause ankle oedema and reflex tachycardia.
- Thiazides lower potassium and raise uric acid and glucose; loop diuretics also lower calcium.
3Heart failure and antiarrhythmics
- Digoxin inhibits Na+/K+-ATPase; toxicity rises with hypokalaemia and shows as nausea, visual changes and arrhythmias.
- Amiodarone causes thyroid dysfunction, pulmonary fibrosis, liver injury and photosensitivity.
- Class IC drugs (flecainide) are avoided after myocardial infarction or in structural heart disease.
- Adenosine terminates SVT within seconds; dipyridamole potentiates it and theophylline blocks it.
4Anticoagulants and antiplatelets
- Warfarin blocks vitamin K epoxide reductase; its effect is monitored by INR and reversed with vitamin K.
- Heparin acts through antithrombin; protamine reverses it, and HIT is a key adverse effect.
- Dabigatran is a direct thrombin inhibitor (reversed by idarucizumab); apixaban and rivaroxaban inhibit factor Xa.
- Clopidogrel is a prodrug activated by CYP2C19; aspirin irreversibly inhibits platelet COX-1.
5Lipid-lowering drugs
- Statins inhibit HMG-CoA reductase; myopathy risk rises with CYP3A4 inhibitors and with fibrates.
- Ezetimibe blocks intestinal cholesterol absorption at the NPC1L1 transporter.
- Fibrates mainly lower triglycerides through PPAR-alpha.
- Niacin causes flushing, which aspirin taken beforehand reduces.
6Sedatives and antiepileptics
- Benzodiazepines increase how often GABA-A chloride channels open; flumazenil reverses them.
- Phenytoin has saturable kinetics, causes gum overgrowth and induces liver enzymes.
- Carbamazepine induces its own metabolism and can cause hyponatraemia and SJS (HLA-B*1502).
- Valproate is the most teratogenic antiepileptic (neural tube defects) and can cause liver toxicity.
7Antidepressants and antipsychotics
- SSRIs take 2–4 weeks to work; combining them with other serotonergic drugs risks serotonin syndrome.
- Tricyclics are dangerous in overdose (wide QRS); sodium bicarbonate is the treatment.
- MAO inhibitors with tyramine-rich food cause a hypertensive crisis.
- Typical antipsychotics cause extrapyramidal effects; clozapine causes agranulocytosis and needs blood monitoring.
8Opioids and NSAIDs
- Opioids cause miosis, constipation and respiratory depression; tolerance does not develop to miosis or constipation.
- Naloxone reverses opioids but is shorter acting than many of them, so re-sedation can occur.
- Codeine and tramadol need CYP2D6 activation; ultra-rapid metabolisers are at risk of toxicity.
- NSAIDs cause GI bleeding and kidney injury; COX-2 selective drugs spare the gut but raise cardiovascular risk.
9Antibacterials
- Beta-lactams block cell wall synthesis; MRSA resists them through altered PBP2a.
- Aminoglycosides are ototoxic and nephrotoxic; their killing is concentration-dependent.
- Fluoroquinolones inhibit DNA gyrase and can cause tendon rupture and QT prolongation.
- Macrolides inhibit CYP3A4 (clarithromycin, erythromycin) and prolong QT; tetracyclines stain developing teeth.
11Cancer chemotherapy
- Methotrexate inhibits dihydrofolate reductase; folinic acid rescues normal cells.
- Doxorubicin causes cumulative cardiotoxicity; bleomycin causes pulmonary fibrosis.
- Cyclophosphamide and ifosfamide cause haemorrhagic cystitis, prevented with mesna.
- Vincristine is neurotoxic and fatal if given intrathecally.
12Endocrine drugs
- Metformin does not cause hypoglycaemia alone; it is held in severe renal impairment because of lactic acidosis risk.
- Sulfonylureas close beta-cell K-ATP channels and cause hypoglycaemia and weight gain.
- SGLT2 inhibitors cause genital infections and euglycaemic ketoacidosis; GLP-1 agonists cause nausea and weight loss.
- Carbimazole and propylthiouracil treat hyperthyroidism; both can cause agranulocytosis.
13Respiratory and GI drugs
- Salbutamol is a short-acting beta-2 agonist; tremor and low potassium are common at high doses.
- Theophylline has a narrow therapeutic range; CYP1A2 inhibitors such as ciprofloxacin raise its level.
- Proton pump inhibitors irreversibly block the H+/K+-ATPase and work best before meals.
- Metoclopramide is a dopamine antagonist that can cause extrapyramidal effects, especially in the young.
These are PharmaPrep's own notes on the knowledge this book teaches. No text, tables or figures are reproduced from it. Read the book for full explanations, and check doses and laws against current official sources.
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