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Goodman & Gilman Simplified - Dr. Rashid Your quick guide to mastering Goodman & Gilman Pharmacology.

Clear, concise, and exam-friendly notes from Dr. Sulthan Al Rashid – making tough concepts easy for every medical learner."

Antithrombotic Drugs1. Heparin / Low-Molecular-Weight HeparinsDrugsHeparinLow-molecular-weight heparinsEnoxaparinDaltepa...
16/07/2026

Antithrombotic Drugs
1. Heparin / Low-Molecular-Weight Heparins
Drugs
Heparin
Low-molecular-weight heparins
Enoxaparin
Dalteparin
Therapeutic Uses
Acute coronary syndromes
Percutaneous coronary interventions
Mechanism / Clinical Pearls
Endogenous polysaccharide, inhibits thrombin (factor IIa) and factor Xa in an antithrombin III–dependent manner
Parenteral use only
Heparin: short t½, complex pharmacokinetics, low bioavailability after subcutaneous injection
Low-molecular-weight heparin: longer half-life, renal excretion; accumulation in renal insufficiency
Heparin-induced thrombocytopenia
2. Fondaparinux
Drug
Fondaparinux
Therapeutic Uses
Acute coronary syndromes
Percutaneous coronary interventions
Mechanism / Clinical Pearls
Synthetic pentasaccharide, antithrombin III–dependent, factor Xa inhibitor
Most favorable efficacy-safety ratio
3. Bivalirudin / Lepirudin
Drugs
Bivalirudin
Lepirudin
Therapeutic Uses
Percutaneous coronary interventions (bivalirudin)
Heparin-induced thrombocytopenia (HIT II) recombinant lepirudin
Mechanism / Clinical Pearls
Direct thrombin (factor IIa) inhibitors
Parenteral use only
Advantage of bivalirudin over heparin unclear

Antiplatelet DrugsDrugsAspirinP2Y₁₂ receptor antagonistsClopidogrelPrasugrelTicagrelorCangrelor (IV)Therapeutic UsesPrev...
10/07/2026

Antiplatelet Drugs
Drugs
Aspirin
P2Y₁₂ receptor antagonists
Clopidogrel
Prasugrel
Ticagrelor
Cangrelor (IV)
Therapeutic Uses
Prevention of thrombotic events (MI, stroke)
Acute coronary syndromes
Prevention of stent thrombosis
Mechanism / Clinical Pearls
↓ Platelet aggregation by inhibiting COX-1–mediated TxA₂ production (aspirin) or ADP receptors (P2Y₁₂ receptor antagonists)
Oral use only: clopidogrel, prasugrel, ticagrelor
Irreversible action: aspirin, clopidogrel, prasugrel
Prodrugs: clopidogrel, prasugrel
Variable CYP2C19-dependent metabolism (clopidogrel)
Withdraw 5–7 days before surgery
First choice in non-STEMI and STEMI
Dual platelet inhibition after stenting
Anti-integrin Drugs
Drugs
Abciximab
Eptifibatide
Tirofiban
Therapeutic Use
Percutaneous coronary interventions
Mechanism / Clinical Pearls
Antibody (abciximab) or small-molecule antagonists at platelet GPIIb/IIIa receptor
Parenteral use only
Highly efficient platelet inhibition
Therapeutic value in the era of highly effective dual platelet inhibition unclear

IvabradineTherapeutic UsesAnginaHeart failureMechanism / ActionSelectively decreases heart rate by inhibiting HCN curren...
27/06/2026

Ivabradine
Therapeutic Uses
Angina
Heart failure
Mechanism / Action
Selectively decreases heart rate by inhibiting HCN currents in the SA node
Clinical Role
Second choice in the prevention of exertional angina
Approved in patients not tolerating β-blockers
Approved in patients with heart rate >75 under β-blockers
Adverse Effects
Bradycardia
QT prolongation
Atrial fibrillation
Phosphenes
Contraindication
Combination with diltiazem or verapamil
Nicorandil
Therapeutic Use
Angina
Mechanism / Action
Dual nitrate-like and IKATP-stimulatory action
Hemodynamic profile between nitrates and dihydropyridines
Decreases afterload more than nitrates
Clinical Role
Second choice in the prevention of exertional angina
Adverse Effects
Hypotension
Headache
Buccal ulcers
Gastrointestinal ulcers
Contraindication
Do not combine with PDE5 inhibitors
Trimetazidine
Therapeutic Use
Angina
Mechanism / Action
Metabolic shift from fatty acid to glycolytic metabolism in the heart
Clinical Role
Second choice in the prevention of exertional angina
Adverse Effect
May increase the incidence of Parkinson's disease

β Blockers and Ranolazine – Bullet Point Summary1) β BlockersDrugsAtenololBisoprololCarvedilolMetoprololNadololNebivolol...
23/06/2026

β Blockers and Ranolazine – Bullet Point Summary
1) β Blockers
Drugs
Atenolol
Bisoprolol
Carvedilol
Metoprolol
Nadolol
Nebivolol
Many others
Therapeutic Uses
Angina
Heart failure
Hypertension
Widely used for other indications such as:
prevention of arrhythmias
rate control in atrial fibrillation
migraine
Major Toxicity and Clinical Pearls
Role in angina / CAD
First choice for prevention of exertional angina
Only antianginal drug class with proven prognostic benefit in CAD
Adverse effects
Bradycardia
AV block
Bronchospasm
Peripheral vasoconstriction
Worsening of acute heart failure
Depression
Worsening of psoriasis
Pharmacology pearl
Metoprolol shows polymorphic CYP2D6 metabolism
Additional vasodilatory β-blockers
Carvedilol
Nebivolol
2) Ranolazine
Therapeutic Use
Angina
Mechanism / Pharmacology
Inhibits late Na⁺ current and other cardiac ion currents
Has weak β-blocking and metabolic effects
Clinical role
Second choice for prevention of exertional angina
Pharmacokinetic pearl
CYP3A4-dependent metabolism

21/06/2026

Ca²⁺ Channel Blockers
Drugs
Dihydropyridines
Amlodipine
Felodipine
Lercanidipine
Nifedipine
Nitrendipine
Others
Diltiazem
Verapamil
Therapeutic Uses
Angina
Hypertension
Rate control in atrial fibrillation
mainly verapamil and diltiazem
Major Toxicity and Clinical Pearls
1) Hemodynamic action
Cause preferential arterial vasodilation
This leads to afterload reduction
2) Role in angina
Dihydropyridines are first choice for vasospastic angina
Calcium channel blockers are second choice for prevention of exertional angina
3) Short-acting nifedipine caution
Immediate-release nifedipine and other short-acting dihydropyridines may cause:
tachycardia
hypotension
may trigger/worsen angina
4) Diltiazem and verapamil
Decrease heart rate
Decrease AV conduction
Should not be used with β-blockers
Why avoid combination with β-blockers?

Because it may cause:

marked bradycardia
AV block
worsening cardiac depression
5) Drug interactions
Verapamil and diltiazem have CYP3A4-mediated drug interactions
6) Adverse effects
Dihydropyridines
Peripheral edema
less with lercanidipine
Verapamil
Constipation

20/06/2026

Drug Facts for Your Personal Formulary: Coronary Artery Disease (CAD)
1. Organic Nitrates
Drugs
Glyceryl trinitrate (GTN, Nitroglycerin)
Isosorbide dinitrate (ISDN)
Isosorbide mononitrate (ISMN)
Therapeutic Uses
Angina
GTN (sublingual) for acute anginal attacks
ISDN and ISMN for prevention of angina
Other Uses
Acute pulmonary edema (IV GTN)
Acute hypertension (IV GTN)
Mechanism of Action
Release nitric oxide (NO).
NO activates soluble guanylyl cyclase → ↑ cGMP → vascular smooth muscle relaxation.
Dilate:
Large veins (predominantly)
Large arteries
Minimal effect on resistance arterioles.
Hemodynamic Effect
↓ Preload (major effect)
↓ Myocardial oxygen demand
Relief of angina
Clinical Pearls
Acute Angina
Short-acting GTN or ISDN are standby drugs for all CAD patients.
Vasospastic (Prinzmetal) Angina
First-choice therapy along with calcium channel blockers.
Chronic Stable/Exertional Angina
Long-acting nitrates are second-line drugs for prevention.
Adverse Effects
Headache (very common)
Dizziness
Postural (orthostatic) hypotension
Syncope
Reflex Effects
Reflex tachycardia may occur.
Tolerance
Tolerance develops after prolonged exposure (>16 hours).
Prevent by maintaining a nitrate-free interval >8 hours daily.
Contraindication
PDE5 Inhibitors

Do not combine with:

Sildenafil
Tadalafil
Vardenafil

Risk:

Severe hypotension
Syncope
Cardiovascular collapse
2. Molsidomine
Therapeutic Use
Angina prophylaxis
Mechanism
Direct nitric oxide donor.
Clinical Pearls
Second-choice drug for prevention of angina.
No documented advantage over GTN, ISDN, or ISMN.
Adverse Effects

Similar to nitrates:

Headache
Dizziness
Hypotension
Syncope
3. Inhaled Nitric Oxide (NO)
Therapeutic Use
Pulmonary hypertension in neonates
Clinical Pearls
Produces relatively selective vasodilation of the pulmonary vascular bed.
Minimal systemic vasodilatory effect compared with systemic nitrates.

19/06/2026

Diuretics in Hypertension and Heart Failure – Complete Summary
1. Thiazide and Thiazide-like Diuretics
Drugs
Thiazides
Chlorothiazide
Hydrochlorothiazide
Thiazide-like
Chlorthalidone
Indapamide
Metolazone
Xipamide
Therapeutic Uses
Hypertension (HTN)
First-line treatment for hypertension.
Edema Associated With
Heart failure (HF)
Liver cirrhosis
Chronic kidney disease
Nephrotic syndrome
Other Uses
Nephrogenic diabetes insipidus
Calcium-containing kidney stones
Special Points
Metolazone and xipamide (not approved in the U.S.) remain effective at GFR

18/06/2026

Antihypertensive Drugs – Complete Summary
1. Calcium Channel Blockers (CCBs)
A. Dihydropyridines
Drugs
Amlodipine
Felodipine
Isradipine
Lercanidipine
Nifedipine (extended release)
Nitrendipine
Therapeutic Uses
Hypertension (HTN)
Angina
Clinical Pearls
Long-acting dihydropyridines are among the first-choice drugs for hypertension.
Potent vasodilators with minimal effects on cardiac conduction.
Major Adverse Effects
Peripheral edema
Flushing
Headache
Dizziness
Reflex tachycardia (especially short-acting agents)
B. Non-Dihydropyridines
Drugs
Verapamil
Diltiazem
Therapeutic Uses
Hypertension
Angina
Rate control in atrial fibrillation
Clinical Pearls
Preferred when effects on heart rate and AV conduction are desired.
Do not combine with β-blockers due to risk of:
Severe bradycardia
AV block
Heart failure worsening
Beware of CYP3A4-mediated drug interactions.
Major Adverse Effects
Bradycardia
AV block
Constipation (especially verapamil)
Worsening heart failure
2. Inhibitors of the Renin–Angiotensin System
A. ACE Inhibitors (ACEIs)
Drugs
Benazepril
Captopril
Enalapril
Lisinopril
Quinapril
Ramipril
Moexipril
Fosinopril
Trandolapril
Perindopril
Therapeutic Uses
Hypertension
Heart failure
Diabetic nephropathy
Clinical Pearls
Among the first-choice drugs for hypertension.
Captopril:
Short acting.
Mainly used for initiation/titration.
Enalapril and Ramipril:
Usually require twice-daily dosing.
Fosinopril:
Eliminated by both liver and kidney.
Useful in patients with heart failure and reduced renal perfusion.
Major Adverse Effects
Dry cough (5–10%)
Angioedema
Hypotension
Hyperkalemia
Skin rash
Neutropenia
Anemia
Fetopathic syndrome (pregnancy)
Contraindications
Pregnancy
Renal artery stenosis
Severe hypovolemia
Use caution in impaired renal function
B. Angiotensin Receptor Blockers (ARBs)
Drugs
Candesartan
Eprosartan
Irbesartan
Losartan
Olmesartan
Telmisartan
Valsartan
Azilsartan
Therapeutic Uses
Hypertension
Heart failure
Diabetic nephropathy
Clinical Pearls
Similar efficacy to ACE inhibitors.
Cause less cough and less angioedema.
No proven superiority over ACE inhibitors.
Combination with ACE inhibitors:
More harm than benefit.
Increased hyperkalemia, renal dysfunction, hypotension.
Contraindications
Pregnancy
Adverse Effects
Hyperkalemia
Hypotension
Renal dysfunction
Rare angioedema
C. Direct Renin Inhibitor
Drug
Aliskiren
Therapeutic Use
Hypertension
Clinical Pearls
Therapeutic value remains uncertain.
No evidence of superiority over ACE inhibitors or ARBs.
Combination with other RAS inhibitors is generally contraindicated.
Adverse Effects
Hyperkalemia
Hypotension
Renal impairment

16/06/2026

Sympatholytic Drugs – Complete Summary
1. β₁-Selective Blockers (Cardioselective β-Blockers)
Drugs
Atenolol
Bisoprolol
Metoprolol
Nebivolol
Many others
Indications
Hypertension (HTN)
Heart failure
Bisoprolol
Metoprolol
Nebivolol
Angina
Prevention of arrhythmias
Rate control in atrial fibrillation
Migraine prophylaxis
Important Clinical Points
Not first-line therapy for uncomplicated hypertension.
Strong indications when hypertension coexists with:
Angina
Heart failure
Atrial fibrillation
Other cardiovascular diseases
Adverse Effects
Bradycardia
AV block
Bronchospasm
Peripheral vasoconstriction
Worsening of acute/decompensated heart failure
Depression
Worsening of psoriasis
Special Features
Metoprolol
Metabolized by CYP2D6
Response varies with CYP2D6 polymorphisms
Nebivolol
Causes NO-mediated vasodilation
Less peripheral vasoconstriction than many β-blockers
2. Nonselective β-Blocker
Drug
Propranolol
Indications
Hypertension
Migraine prophylaxis
Important Clinical Points
Not first-line treatment for hypertension.
Adverse Effects
Effects due to β₂ blockade, including:
Bronchospasm
Peripheral vasoconstriction
Masking of hypoglycemia
3. α₁-Blockers
Drugs
Alfuzosin
Doxazosin
Prazosin
Terazosin
Indications
Benign prostatic hyperplasia (BPH)
Hypertension
Important Clinical Points
Not first-line therapy for hypertension.
Associated with a higher incidence of heart failure in some studies.
Tachyphylaxis may develop with chronic use.
Special Notes
Phenoxybenzamine
Irreversible α₁/α₂ blocker
Used in pheochromocytoma
Silodosin and Tamsulosin
Primarily used for BPH
Can still lower blood pressure; monitor for hypotension
Adverse Effects
Orthostatic hypotension
Dizziness
Reflex tachycardia
First-dose syncope (especially prazosin)
4. α₁ + β Blockers
Drugs
Carvedilol
Labetalol
Indications
Hypertension
Heart failure (Carvedilol)
Important Clinical Points
Carvedilol
Among the first-line β-blockers for heart failure.
Particularly useful in patients with peripheral arterial disease because α₁ blockade reduces peripheral vasoconstriction.
Labetalol
First-choice antihypertensive in pregnancy.
Commonly used in hypertensive emergencies and severe hypertension during pregnancy.
5. Central Sympatholytic Drugs
Drugs
Methyldopa
Clonidine
Moxonidine
Indication
Hypertension
Important Clinical Points
Not first-line treatment for hypertension.
Adverse Effects
Fatigue
Depression
Nasal congestion
Additional High-Yield Points
Methyldopa
Preferred antihypertensive during pregnancy.
May cause:
Positive Coombs test
Hemolytic anemia
Hepatotoxicity
Clonidine
Abrupt withdrawal can cause rebound hypertension.

12/06/2026

Direct Vasodilators – Complete Summary
1. Hydralazine
Indications
Hypertension (HTN)
Heart failure in African Americans
Used as a fixed combination with isosorbide dinitrate (ISDN)
Important Clinical Points
Not a first-line drug for hypertension.
Particularly useful when combined with ISDN in selected heart failure patients.
Usually given with a β-blocker to reduce reflex sympathetic activation (baroreceptor reflex).
Adverse Effects
Headache
Nausea
Flushing
Hypotension
Palpitations
Tachycardia
Dizziness
Important Clarification

The table lists angina pectoris among adverse effects. More accurately:

Hydralazine causes reflex tachycardia and increased myocardial oxygen demand.
This can precipitate or worsen angina in patients with coronary artery disease (CAD).
Therefore, angina is a consequence of reflex sympathetic activation rather than a direct toxic effect.
Special Precautions
Use cautiously in patients with coronary artery disease (CAD).
High doses may cause drug-induced lupus syndrome.
Pharmacogenetics
Undergoes acetylation metabolism.
Patients may be:
Slow acetylators
Fast acetylators
Slow acetylators have a higher risk of adverse effects, including lupus-like syndrome.
2. Minoxidil
Indications
Severe or resistant hypertension
Alopecia (topical use)
Important Clinical Points
Reserve antihypertensive drug, especially in patients with renal insufficiency.
Produces powerful arteriolar vasodilation.
Adverse Effects
Water retention
Reflex tachycardia
Angina
Pericardial effusion
Hypertrichosis (excessive hair growth)
Combination Therapy

Usually administered together with:

A diuretic (to prevent fluid retention)
A β-blocker (to prevent reflex tachycardia)
A RAS inhibitor
Contraindication
Pheochromocytoma
3. Sodium Nitroprusside
Indication
Hypertensive emergencies
Important Clinical Points
Administered only intravenously.
Intended for short-term use due to toxicity risk.
Produces rapid reduction in blood pressure.
Adverse Effects
Hypotension
Cyanide intoxication/toxicity (major concern with prolonged infusion or high doses)

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