High-Yield Pharmacology
Pharmacology is consistently one of the highest-yield Step 1 domains. Nearly every cardiovascular, infectious, and neurologic question contains a drug component. The exam rewards recognition of side effect patterns.
Focus on Three Core Areas
Mastery requires understanding three elements for each drug:
- Mechanism: How does the drug work at the molecular level?
- Indication: What condition does it treat?
- Side effects: What are the signature adverse effects?
Cardiovascular and Anticoagulation Drugs
Warfarin is a vitamin K epoxide reductase inhibitor monitored by PT/INR. It is teratogenic and requires heparin bridging due to initial protein C inhibition.
Heparin activates antithrombin III to inhibit thrombin and factor Xa. Monitor via PTT. Protamine sulfate reverses it. Watch for heparin-induced thrombocytopenia (HIT).
Aspirin irreversibly inhibits COX-1 and COX-2. Low doses work for antiplatelet effects; high doses reduce inflammation. Overdose causes tinnitus.
Statins inhibit HMG-CoA reductase and lower LDL cholesterol. Key side effects include myopathy (worse with fibrates) and hepatotoxicity.
Beta-blockers block beta-1 receptors (heart) and/or beta-2 receptors (lungs). They treat hypertension, CHF, angina, and arrhythmias but mask hypoglycemia symptoms.
ACE inhibitors block conversion of angiotensin I to II. They are first-line for heart failure and hypertension. Side effects: dry cough, hyperkalemia, angioedema. Teratogenic in pregnancy.
Diuretics
Furosemide is a loop diuretic that inhibits the Na-K-2Cl cotransporter in the thick ascending limb. Side effects: hypokalemia, ototoxicity, hypocalcemia.
Hydrochlorothiazide blocks Na-Cl reabsorption in the distal tubule. Causes hyponatremia, hypokalemia, hypercalcemia, hyperuricemia, and hyperglycemia.
Antibiotics
Penicillins are beta-lactams that inhibit cell wall synthesis. Type I hypersensitivity is common, so always test for penicillin allergy first.
Vancomycin binds D-Ala-D-Ala on the bacterial cell wall. Use it for MRSA and oral C. difficile. Red man syndrome occurs with rapid infusion.
Fluoroquinolones inhibit DNA gyrase and topoisomerase IV. Avoid in children and pregnancy due to tendon rupture risk and QT prolongation.
Aminoglycosides (gentamicin, tobramycin) inhibit the 30S ribosome. They are nephrotoxic and ototoxic, requiring IV administration.
Psychiatry and Endocrine Drugs
SSRIs are first-line for depression and anxiety. Common side effects: sexual dysfunction, GI upset, SIADH. Risk of serotonin syndrome with other serotonergic drugs.
Benzodiazepines allosterically modulate GABA-A receptors. They provide anxiolysis, sedation, and anticonvulsant effects. Flumazenil reverses them. Additive CNS effects with alcohol.
Metformin is first-line for type 2 diabetes. It decreases hepatic gluconeogenesis and does not cause hypoglycemia. Risk of lactic acidosis in chronic kidney disease.
Insulin drives potassium into cells, promotes glucose uptake, and inhibits lipolysis. Main risks: hypoglycemia and hypokalemia.
| Term | Meaning |
|---|---|
| Warfarin | Vitamin K epoxide reductase inhibitor. Monitored by PT/INR. Teratogenic. Bridged with heparin due to initial protein C inhibition. |
| Heparin | Activates antithrombin III, inhibiting thrombin and factor Xa. Monitored by PTT. Reversed with protamine sulfate. Risks HIT. |
| Aspirin | Irreversible COX-1 and COX-2 inhibitor. Antiplatelet at low dose, anti-inflammatory at high. Causes tinnitus in overdose. |
| Statins | HMG-CoA reductase inhibitors. Lower LDL. Side effects: myopathy (worse with fibrates), hepatotoxicity. |
| Beta-blockers | Block beta-1 (heart) and/or beta-2 (lungs). Used for HTN, CHF, angina, arrhythmias. Mask hypoglycemia. |
| ACE inhibitors | Block conversion of angiotensin I to II. First-line for HF and HTN. Side effects: dry cough, hyperkalemia, angioedema. Teratogenic. |
| Furosemide | Loop diuretic inhibiting Na-K-2Cl in the thick ascending limb. Causes hypokalemia, ototoxicity, hypocalcemia. |
| Hydrochlorothiazide | Distal tubule Na-Cl inhibitor. Causes hyponatremia, hypokalemia, hypercalcemia, hyperuricemia, hyperglycemia. |
| Penicillins | Beta-lactam antibiotics inhibiting cell wall synthesis. Type I hypersensitivity common; test for allergy before administration. |
| Vancomycin | Glycopeptide binding D-Ala-D-Ala of cell wall. Used for MRSA and C. diff (oral). Red man syndrome from rapid infusion. |
| Fluoroquinolones | Inhibit DNA gyrase and topoisomerase IV. Tendon rupture, QT prolongation, not for children or pregnancy. |
| Aminoglycosides | 30S ribosomal inhibitors (gentamicin, tobramycin). Nephrotoxic and ototoxic. Require IV administration. |
| SSRIs | First-line for depression and anxiety. Sexual side effects, GI upset, SIADH. Risk of serotonin syndrome with other serotonergics. |
| Benzodiazepines | Allosteric GABA-A modulators. Anxiolytic, sedative, anticonvulsant. Reverse with flumazenil. Additive with alcohol. |
| Metformin | First-line type 2 diabetes drug. Decreases hepatic gluconeogenesis. Does not cause hypoglycemia. Lactic acidosis risk in CKD. |
| Insulin | Drives K+ into cells, promotes glucose uptake, inhibits lipolysis. Risk of hypoglycemia and hypokalemia. |
High-Yield Microbiology and Immunology
Microbiology rewards pattern recognition: recognize the clinical vignette, identify the pathogen, select the drug. Immunology is conceptually dense but smaller in scope. Focus on hypersensitivity reactions, immunodeficiencies, and the complement cascade.
Bacterial Pathogens
Staphylococcus aureus is a gram-positive coccus that grows in clusters. It is catalase and coagulase positive. Causes skin infections, endocarditis, pneumonia, and toxic shock syndrome.
Streptococcus pneumoniae is a gram-positive diplococcus that is alpha-hemolytic and optochin-sensitive. It is the most common cause of community-acquired pneumonia and otitis media.
Streptococcus pyogenes (Group A Strep) is beta-hemolytic and bacitracin-sensitive. It causes pharyngitis, cellulitis, rheumatic fever, and post-streptococcal glomerulonephritis.
Escherichia coli is a gram-negative rod that ferments lactose. It causes the majority of UTIs and gram-negative sepsis. EHEC O157:H7 causes hemolytic uremic syndrome.
Neisseria meningitidis is a gram-negative diplococcus with a polysaccharide capsule. It causes meningitis and Waterhouse-Friderichsen syndrome.
Pseudomonas aeruginosa is a gram-negative, oxidase-positive rod. Common in burn patients, cystic fibrosis, and neutropenic individuals. Produces a fruity odor and blue-green pigment.
Clostridioides difficile is a gram-positive, spore-forming anaerobe. It causes antibiotic-associated pseudomembranous colitis. Treat with oral vancomycin or fidaxomicin.
Viruses and Other Pathogens
Mycobacterium tuberculosis is an acid-fast bacillus causing pulmonary TB. Chest X-ray shows Ghon complex. Standard treatment: RIPE (rifampin, isoniazid, pyrazinamide, ethambutol).
HIV is a retrovirus infecting CD4+ T cells. ELISA screening must be confirmed with additional testing. AIDS is defined by CD4 count below 200 or an opportunistic infection.
Hepatitis B is a DNA virus. Key markers include HBsAg (active infection), anti-HBs (immunity), and HBcAb (exposure history). Risk of cirrhosis and hepatocellular carcinoma.
Hypersensitivity Reactions
Type I hypersensitivity is IgE-mediated mast cell degranulation. Presents with anaphylaxis, atopy, and allergies. Onset is immediate.
Type II hypersensitivity involves antibody-mediated (IgG/IgM) cytotoxicity. Examples: hemolytic anemia, Goodpasture syndrome, myasthenia gravis.
Type III hypersensitivity results from immune complex deposition. Examples: SLE, post-streptococcal glomerulonephritis, serum sickness.
Type IV hypersensitivity is T-cell mediated and delayed. Examples: contact dermatitis, TB skin test, graft rejection.
Antigen Presentation and Complement
MHC class I presents endogenous antigen to CD8+ T cells. It is expressed on all nucleated cells and loaded in the endoplasmic reticulum.
MHC class II presents exogenous antigen to CD4+ T cells. Expression is limited to professional antigen-presenting cells: dendritic cells, macrophages, and B cells.
Complement cascade has three pathways (classical, alternative, lectin) that converge on C3 activation. C5a drives chemotaxis. The membrane attack complex forms at C5b-9.
| Term | Meaning |
|---|---|
| Staphylococcus aureus | Gram-positive cocci in clusters, catalase and coagulase positive. Causes skin infections, endocarditis, pneumonia, toxic shock. |
| Streptococcus pneumoniae | Gram-positive diplococci, alpha-hemolytic, optochin-sensitive. Most common cause of community-acquired pneumonia and otitis media. |
| Streptococcus pyogenes (Group A) | Beta-hemolytic, bacitracin-sensitive. Causes pharyngitis, cellulitis, rheumatic fever, post-strep glomerulonephritis. |
| Escherichia coli | Gram-negative rod, lactose fermenter. Most common cause of UTI and gram-negative sepsis. EHEC O157:H7 causes HUS. |
| Neisseria meningitidis | Gram-negative diplococci with polysaccharide capsule. Causes meningitis and Waterhouse-Friderichsen syndrome. |
| Mycobacterium tuberculosis | Acid-fast bacillus causing pulmonary TB. Ghon complex on CXR. Treated with RIPE (rifampin, isoniazid, pyrazinamide, ethambutol). |
| Pseudomonas aeruginosa | Gram-negative oxidase-positive rod. Causes infections in burn patients, CF, and neutropenia. Fruity odor, blue-green pigment. |
| Clostridioides difficile | Gram-positive, spore-forming anaerobe. Causes antibiotic-associated pseudomembranous colitis. Treat with oral vancomycin or fidaxomicin. |
| HIV | Retrovirus infecting CD4+ cells. Diagnosed by ELISA then confirmatory testing. AIDS defined by CD4 <200 or opportunistic infection. |
| Hepatitis B | DNA virus. Markers: HBsAg (active), anti-HBs (immunity), HBcAb (exposure). Risk of cirrhosis and HCC. |
| Type I hypersensitivity | IgE-mediated mast cell degranulation. Anaphylaxis, atopy, allergy. Immediate onset. |
| Type II hypersensitivity | Antibody-mediated (IgG/IgM) cytotoxicity. Examples: hemolytic anemia, Goodpasture, myasthenia gravis. |
| Type III hypersensitivity | Immune complex deposition. Examples: SLE, post-strep GN, serum sickness. |
| Type IV hypersensitivity | T-cell mediated, delayed. Examples: contact dermatitis, TB skin test, graft rejection. |
| MHC class I | Presents endogenous antigen to CD8+ T cells. Expressed on all nucleated cells. Loaded in the ER. |
| MHC class II | Presents exogenous antigen to CD4+ T cells. Expressed on professional APCs (dendritic cells, macrophages, B cells). |
| Complement cascade | Classical (antibody), alternative (pathogen surface), and lectin pathways converge on C3. C5a chemotaxis; MAC forms at C5b-9. |
High-Yield Pathology and Biochem
Pathology is the heart of Step 1 and demands instant recognition of histology, clinical presentations, and key associations. Biochemistry focuses on inborn errors of metabolism and regulation of critical pathways.
Cell Death and Tissue Injury
Apoptosis is programmed cell death that occurs without inflammation. It proceeds via intrinsic (mitochondrial) or extrinsic (Fas) pathways, both activating caspases.
Necrosis has several types: coagulative (infarction), liquefactive (brain and abscess), caseous (tuberculosis), fat (pancreatitis), fibrinoid (vasculitis), and gangrenous.
Granulomas are collections of epithelioid macrophages, often with central caseous necrosis. Associated with tuberculosis, sarcoidosis, and fungal infections.
Malignancy and Genetics
Philadelphia chromosome is a t(9;22) translocation producing the BCR-ABL fusion gene. It is the hallmark of chronic myeloid leukemia and is treated with imatinib.
BRCA1/2 mutations are autosomal dominant loss-of-function mutations that increase breast and ovarian cancer risk. BRCA1 mutations also increase risk of triple-negative breast cancer.
Inborn Errors of Metabolism
Phenylketonuria (PKU) results from phenylalanine hydroxylase deficiency. Phenylalanine accumulation causes intellectual disability and a musty odor. Management requires a low-phenylalanine diet.
Maple syrup urine disease is caused by branched-chain alpha-keto dehydrogenase deficiency. Presents with sweet-smelling urine and rapid neurological deterioration in neonates.
G6PD deficiency is X-linked and causes NADPH deficiency in red blood cells. Hemolysis occurs with oxidative stress (fava beans, sulfa drugs, primaquine). Labs show Heinz bodies and bite cells.
Tay-Sachs disease is hexosaminidase A deficiency causing GM2 ganglioside accumulation. Features include cherry-red macula, progressive neurodegeneration, and notably no hepatomegaly.
Gaucher disease results from glucocerebrosidase deficiency. Presents with hepatosplenomegaly, pancytopenia, and characteristic Gaucher cells (crumpled-tissue appearance macrophages).
Blood Disorders
Sickle cell anemia is autosomal recessive, caused by a glutamate-to-valine mutation at position 6 of beta globin. Features: vaso-occlusion, hemolysis, and autosplenectomy.
Beta-thalassemia involves reduced or absent beta-globin synthesis. Labs show microcytic anemia, target cells, elevated HbA2, and elevated HbF.
Cystic fibrosis is autosomal recessive CFTR mutation causing thick secretions. Results in recurrent pulmonary infections, pancreatic insufficiency, and infertility.
Neurologic and Connective Tissue Disorders
Huntington disease is autosomal dominant, caused by CAG trinucleotide repeat expansion in the HTT gene. Symptoms: chorea, dementia, and psychiatric disturbance. MRI shows caudate atrophy.
Marfan syndrome is autosomal dominant FBN1 mutation. Features: tall stature, arachnodactyly, aortic root dilation or dissection, and lens dislocation.
Neurofibromatosis type 1 is autosomal dominant NF1 mutation. Presents with cafe-au-lait spots, neurofibromas, Lisch nodules, and optic nerve gliomas.
| Term | Meaning |
|---|---|
| Apoptosis | Programmed cell death without inflammation. Caspase cascade via intrinsic (mitochondrial) or extrinsic (Fas) pathway. |
| Necrosis types | Coagulative (infarct), liquefactive (brain, abscess), caseous (TB), fat (pancreatitis), fibrinoid (vasculitis), gangrenous. |
| Granuloma | Collection of epithelioid macrophages, often with central caseation. Associated with TB, sarcoidosis, fungal infections. |
| Philadelphia chromosome | t(9;22) producing BCR-ABL fusion. Hallmark of chronic myeloid leukemia. Treated with imatinib. |
| BRCA1/2 mutations | Autosomal dominant loss-of-function mutations increasing breast and ovarian cancer risk. BRCA1 also increases risk of triple-negative breast cancer. |
| Phenylketonuria (PKU) | Phenylalanine hydroxylase deficiency. Buildup of phenylalanine causes intellectual disability, musty odor. Low-phe diet required. |
| Maple syrup urine disease | Branched-chain alpha-keto dehydrogenase deficiency. Sweet-smelling urine, neurological deterioration in neonates. |
| G6PD deficiency | X-linked. NADPH deficiency in RBCs causes hemolysis with oxidative stress (fava beans, sulfa, primaquine). Heinz bodies, bite cells. |
| Tay-Sachs disease | Hexosaminidase A deficiency. GM2 ganglioside accumulation. Cherry-red macula, progressive neurodegeneration, no hepatomegaly. |
| Gaucher disease | Glucocerebrosidase deficiency. Hepatosplenomegaly, pancytopenia, Gaucher cells (crumpled-tissue macrophages). |
| Sickle cell anemia | Autosomal recessive HbS mutation (glutamate → valine at position 6 of beta globin). Vaso-occlusion, hemolysis, autosplenectomy. |
| Beta-thalassemia | Reduced or absent beta-globin synthesis. Microcytic anemia, target cells, elevated HbA2 and HbF. |
| Cystic fibrosis | Autosomal recessive CFTR mutation. Thick secretions cause recurrent pulmonary infections, pancreatic insufficiency, infertility. |
| Huntington disease | Autosomal dominant CAG trinucleotide repeat expansion in HTT. Chorea, dementia, psychiatric disturbance. Caudate atrophy. |
| Marfan syndrome | Autosomal dominant FBN1 mutation. Tall stature, arachnodactyly, aortic root dilation/dissection, lens dislocation. |
| Neurofibromatosis type 1 | Autosomal dominant NF1 mutation. Café-au-lait spots, neurofibromas, Lisch nodules, optic gliomas. |
How to Study step 1 Effectively
Mastering Step 1 requires the right strategy, not just more study hours. Research in cognitive science shows three techniques produce the best outcomes: active recall (testing yourself rather than rereading), spaced repetition (reviewing at scientifically-optimized intervals), and interleaving (mixing related topics instead of studying one in isolation). FluentFlash is built around all three.
When you study with our FSRS algorithm, every term appears for review at exactly the moment you are about to forget it. This maximizes retention while minimizing study time spent.
Why Passive Review Fails
The most common mistake is relying on passive methods. Rereading notes, highlighting textbook passages, and watching lectures feel productive. However, research shows these methods produce only 10-20% of the retention that active recall achieves. Flashcards force your brain to retrieve information, which strengthens memory far more than recognition alone.
Pair active recall with spaced repetition scheduling, and you can learn in 20 minutes what passive review would take hours to accomplish.
Your First Two Weeks
Start by creating 15-25 flashcards covering the highest-priority concepts. Review them daily for the first week using FSRS scheduling. As cards become easier, intervals automatically expand from minutes to days to weeks. You are always working on material at the edge of your knowledge.
After 2-3 weeks of consistent practice, Step 1 concepts become automatic rather than effortful to recall.
Daily Study Process
- Generate flashcards using FluentFlash AI or create them manually from your notes
- Study 15-20 new cards per day, plus scheduled reviews
- Use multiple study modes (flip, multiple choice, written) to strengthen recall
- Track your progress and identify weak topics for focused review
- Review consistently, as daily practice beats marathon sessions
- 1
Generate flashcards using FluentFlash AI or create them manually from your notes
- 2
Study 15-20 new cards per day, plus scheduled reviews
- 3
Use multiple study modes (flip, multiple choice, written) to strengthen recall
- 4
Track your progress and identify weak topics for focused review
- 5
Review consistently, daily practice beats marathon sessions
Why Flashcards Work Better Than Other Study Methods for step 1
Flashcards are one of the most research-backed study tools for any subject, including Step 1. The reason lies in how memory works. When you read a textbook passage, your brain stores information in short-term memory. Without retrieval practice, it fades within hours. Flashcards force retrieval, which transfers information from short-term to long-term memory.
The Testing Effect
The testing effect is documented in hundreds of peer-reviewed studies. Students who study with flashcards consistently outperform those who reread by 30-60% on delayed tests. This is not because flashcards contain more information. It is because retrieval strengthens neural pathways in a way that passive exposure cannot.
Every time you successfully recall a Step 1 concept from a flashcard, you make that concept easier to recall next time. The retrieval act itself is the mechanism of learning.
FSRS Amplifies the Effect
FluentFlash amplifies this effect with the FSRS algorithm, a modern spaced repetition system. It schedules reviews at mathematically-optimal intervals based on your actual performance. Cards you find easy move further into the future. Cards you struggle with come back sooner.
Over time, this builds remarkable retention with minimal time investment. Students using FSRS-based systems typically retain 85-95% of material after 30 days, compared to roughly 20% retention from passive review alone.