INICET Musculoskeletal & Rheumatology Pharmacology Glossary 2026: NSAIDs, DMARDs, Anti-Gout Drugs and Biologics

You are probably staring at another rheumatology pharmacology chapter wondering how to memorize 47 different drug mechanisms, 23 side effect profiles, and the contraindications for every DMARD without your brain melting. INICET loves testing the intricate details — methotrexate monitoring schedules, anti-TNF contraindications, and whether febuxostat or allopurinol causes more drug interactions.

This glossary cuts through the noise. Every drug class gets mechanism + high-yield side effects + MCQ traps that INICET actually tests. No fluff, no generic overviews. Just the exam-ready facts you need to distinguish between tocilizumab and tofacitinib when the clock is ticking.

The pattern is predictable: INICET asks about NSAIDs selectivity (COX-1 vs COX-2), DMARD toxicity monitoring (folate with methotrexate, ophthalmology with hydroxychloroquine), and biologics mechanisms (which targets TNF vs IL-6 vs JAK). Master these core concepts and the MCQs become pattern recognition instead of guesswork.

NSAIDs: COX Selectivity and Clinical Applications

Mechanism and Classification

NSAIDs work by inhibiting cyclooxygenase (COX) enzymes, blocking prostaglandin synthesis. INICET focuses heavily on COX-1 vs COX-2 selectivity and clinical implications.

COX-1 (Constitutive)

• Present in stomach, kidneys, platelets

• Produces protective prostaglandins

• Inhibition causes GI toxicity and bleeding

COX-2 (Inducible)

• Upregulated during inflammation

• Target for anti-inflammatory effect

• Selective inhibition reduces GI side effects

High-Yield NSAIDs Classification

Aspirin Mnemonic: "ASPIRIN ACTS"

• Antiplatelet (irreversible)

• Salicylism at high doses

• Prostaglandin inhibition

• Irreversible COX binding

• Reye syndrome (avoid in children)

• Inflammation reduction

• No reversibility

When preparing for pharmacology sections, Oncourse's adaptive MCQ bank serves INICET-level questions specifically on NSAID selectivity and can filter by drug class to focus your weak areas.

NSAID Side Effects and Contraindications

Gastrointestinal Effects

• Gastritis, peptic ulcers, bleeding

• Mechanism: COX-1 inhibition reduces protective prostaglandins

• Risk factors: Age >60, H. pylori, steroids, anticoagulants

Renal Effects

• Acute kidney injury, fluid retention

• Mechanism: Reduced prostaglandin-mediated renal blood flow

• Higher risk in elderly, dehydrated, or CHF patients

Cardiovascular Effects

• Increased MI and stroke risk (except aspirin)

• COX-2 selective drugs have higher CV risk

• Mechanism: Altered prostacyclin/thromboxane balance

DMARDs: Disease-Modifying Anti-Rheumatic Drugs

Conventional Synthetic DMARDs (csDMARDs)

Methotrexate (MTX)

• Mechanism: Dihydrofolate reductase inhibition

• Dose: 7.5-25 mg weekly (oral/subcutaneous)

• Monitoring: CBC, LFTs, creatinine every 4-8 weeks

• Toxicity: Hepatotoxicity, pneumonitis, bone marrow suppression

Methotrexate Monitoring Mnemonic: "MTX CALLS BACK"

• Monthly CBC initially

• Twice yearly chest X-ray

• X-tra folate supplementation

• Creatinine every visit

• ALT/AST every month

• Liver biopsy if persistent elevation

• Lung function if dyspnea

• Stop if pancytopenia

• Back to baseline before restarting

• Alcohol counseling

• Contraception counseling

• Kidney function monitoring

The toxicity tables for DMARDs convert perfectly into spaced repetition flashcards on Oncourse — surfaces forgotten monitoring schedules at optimal intervals to cut review time significantly.

Hydroxychloroquine (HCQ)

• Mechanism: Unclear — lysosomal pH alteration, TLR inhibition

• Dose: 5 mg/kg/day (max 400 mg)

• Monitoring: Annual ophthalmology exam

• Toxicity: Retinal toxicity (irreversible), cardiomyopathy

Sulfasalazine (SSZ)

• Mechanism: 5-ASA release in colon, unknown RA mechanism

• Dose: 2-3 g daily in divided doses

• Monitoring: CBC, LFTs

• Toxicity: GI upset, rash, oligospermia (reversible)

Leflunomide

• Mechanism: Dihydroorotate dehydrogenase inhibition

• Active metabolite: A77 1726 (long half-life)

• Monitoring: CBC, LFTs, blood pressure

• Washout: Cholestyramine for toxicity/pregnancy

Targeted Synthetic DMARDs (tsDMARDs)

JAK Inhibitors

• Mechanism: Janus kinase pathway inhibition

• Examples: Tofacitinib (JAK1/JAK3), Baricitinib (JAK1/JAK2)

• Monitoring: CBC, lipids, LFTs

• Warnings: Infections, malignancy, thrombosis

Biologics: Targeted Immunotherapy

Anti-TNF Agents

Mechanism: TNF-α neutralization reduces inflammatory cascade

Anti-TNF Contraindications Mnemonic: "TNF BLOCKS IMMUNITY"

• Tuberculosis (active or latent)

• Neurologic demyelinating disease

• Fungal infections (systemic)

• B-cell lymphoma risk

• Live vaccines contraindicated

• Opportunistic infections

• CHF (moderate to severe)

• Known hypersensitivity

• Skin cancer (melanoma)

• Immunodeficiency states

• Malignancy (active)

• Multiple sclerosis

• Uncontrolled infections

• Neutropenia

• Infection screening required

• TB screening mandatory

• Yellow fever vaccine avoid

Oncourse's mock test analytics break down performance by rheumatology pharmacology topics, so students can see exactly where their anti-TNF knowledge stands vs INICET benchmarks.

Non-TNF Biologics

Tocilizumab (Anti-IL-6 Receptor)

• Mechanism: IL-6 receptor antagonism

• Route: IV or SC

• Monitoring: Neutrophils, platelets, lipids, LFTs

• Side effects: Infections, GI perforation, hepatotoxicity

Rituximab (Anti-CD20)

• Mechanism: B-cell depletion

• Use: RA, vasculitis, after TNF failure

• Monitoring: Immunoglobulins, HBV reactivation

• Premedication: Methylprednisolone, antihistamines

Abatacept (CTLA-4-Ig)

• Mechanism: T-cell costimulation blockade

• Route: IV or SC

• Lower infection risk than TNF inhibitors

• Avoid live vaccines

Anti-Gout Drugs: Acute and Chronic Management

Acute Gout Treatment

Colchicine

• Mechanism: Microtubule polymerization inhibition

• Dosing: 1.2 mg, then 0.6 mg 1 hour later

• Maximum: 1.8 mg in 24 hours

• Side effects: Diarrhea (dose-limiting), nausea

Colchicine Mechanism Mnemonic: "MICRO TUBES"

• Microtubule disruption

• Inflammation reduction

• Chemotaxis inhibition

• Rapid onset (1-2 hours)

• Only for acute attacks initially

NSAIDs for Acute Gout

• First-line: Indomethacin, naproxen, ibuprofen

• Avoid aspirin (can precipitate attack at low doses)

• Contraindications: Kidney disease, GI bleeding

Corticosteroids

• Indications: NSAID/colchicine contraindicated

• Options: Oral prednisolone, intra-articular injection

• Taper over 7-14 days

Chronic Gout Prevention

Xanthine Oxidase Inhibitors Allopurinol

• Mechanism: Xanthine oxidase inhibition

• Starting dose: 100 mg daily, titrate up

• Target: Uric acid <6 mg/dL

• Major side effect: Stevens-Johnson syndrome (HLA-B*5801)

• Drug interactions: Azathioprine, warfarin

Febuxostat

• Mechanism: Selective xanthine oxidase inhibition

• Advantages: Fewer drug interactions, safe in mild-moderate CKD

• CV warning: Increased CV death vs allopurinol

• Dose: 40-80 mg daily

Uricosuric Agents Probenecid

• Mechanism: Blocks renal uric acid reabsorption

• Requires normal kidney function (CrCl >50)

• Drug interactions: Penicillins, NSAIDs

• Contraindications: Kidney stones, high uric acid excretion

Uric Acid Lowering Comparison

When reviewing complex drug interaction tables, students often miss key details. Practice with NSAIDs MCQs on Oncourse helps identify these commonly tested interaction patterns.

Glucocorticoids in Rheumatology

Mechanism and Potency

Anti-inflammatory Mechanism

• Inhibit phospholipase A2 via lipocortin

• Reduce prostaglandin and leukotriene synthesis

• Suppress inflammatory cell migration

Relative Potencies (Anti-inflammatory)

• Hydrocortisone: 1

• Prednisolone: 4

• Methylprednisolone: 5

• Dexamethasone: 25

Clinical Applications

Pulse Therapy

• Methylprednisolone 1 g IV daily × 3 days

• Indications: Lupus nephritis, vasculitis, severe RA flares

• Follow with oral taper

Bridge Therapy

• Low-dose prednisolone (≤7.5 mg daily) while starting DMARDs

• Provides symptom relief during DMARD onset lag

• Minimize duration due to toxicity

Intra-articular Injection

• Triamcinolone acetonide most common

• Provides local anti-inflammatory effect

• Avoid in infected joints

Common INICET MCQ Traps

High-Yield Trap Scenarios

Trap 1: MTX Toxicity Prevention

• Question stem: "Patient on MTX develops mouth ulcers"

• Trap: Increase MTX dose

• Correct: Add folate supplementation

Trap 2: Anti-TNF Screening

• Question stem: "Before starting etanercept..."

• Trap: Only check CBC

• Correct: TB screening (chest X-ray, IGRA, clinical assessment)

Trap 3: Gout Drug Timing

• Question stem: "Patient starts allopurinol, develops acute attack"

• Trap: Stop allopurinol immediately

• Correct: Continue allopurinol, treat acute attack separately

Trap 4: COX-2 Selectivity

• Question stem: "Safest NSAID for peptic ulcer patient"

• Trap: Any non-selective NSAID

• Correct: Celecoxib (but still monitor for CV risk)

Review comprehensive analgesics and anti-inflammatory drug flashcards to reinforce these commonly tested concepts through spaced repetition.

Frequently Asked Questions

What are the key differences between MTX and hydroxychloroquine monitoring?

MTX requires monthly CBC, LFTs, and creatinine due to hepatic and bone marrow toxicity. Hydroxychloroquine needs annual ophthalmology exams for retinal toxicity screening — the retinal damage is irreversible, making early detection critical.

Which anti-TNF agent is safest during pregnancy?

Certolizumab is preferred during pregnancy because it's PEGylated and doesnt cross the placenta. Etanercept and adalimumab cross minimally in first trimester but should be stopped before third trimester.

Why cant you use aspirin for acute gout attacks?

Low-dose aspirin can precipitate gout attacks by reducing uric acid excretion through the kidneys. High-dose aspirin (>3g daily) is uricosuric but impractical due to toxicity. Use indomethacin, naproxen, or colchicine instead.

What's the mechanism behind rituximab delayed infections?

Rituximab depletes CD20-positive B cells, reducing antibody production for 6-12 months. This creates prolonged immunosuppression beyond the drug's half-life, requiring infection vigilance long after treatment.

How do you distinguish between febuxostat and allopurinol drug interactions?

Allopurinol inhibits xanthine oxidase and aldehyde oxidase, affecting azathioprine, mercaptopurine, and warfarin metabolism. Febuxostat selectively inhibits xanthine oxidase only, causing fewer drug interactions — key advantage for poly-pharmacy patients.

Which DMARD requires cholestyramine washout?

Leflunomide's active metabolite (A77 1726) has a very long half-life. Cholestyramine binds the metabolite in the gut, accelerating elimination during toxicity or before pregnancy. This washout protocol is unique to leflunomide.

For deeper understanding of these drug mechanisms and interactions, explore our comprehensive pharmacology lessons covering each drug class in detail.

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Master these core concepts and INICET rheumatology pharmacology becomes pattern recognition. Every drug class follows predictable testing patterns — mechanism, monitoring, contraindications, and drug interactions. Focus on the high-yield details that distinguish similar drugs.

Prepare smarter with Oncourse AI — adaptive MCQs, spaced repetition, and AI explanations built for INICET. Download free on Android and iOS.