Analgesics and Anti-inflammatory Drugs Practice Questions

Q: Which of the following is a TNF-alpha inhibitor?

Etanercept. **Explanation:** **Etanercept** is a TNF-alpha inhibitor. It is a genetically engineered fusion protein consisting of two identical chains of the recombinant human TNF-receptor (p75) bound to the Fc fraction of human IgG1. It acts as a **"decoy receptor,"** binding to circulating TNF-alpha and TNF-beta, thereby preventing them from interacting with cell surface receptors and reducing the pro-inflammatory cascade. **Analysis of Incorrect Options:** * **Abatacept (Option B):** This is a **T-cell costimulation modulator**. It consists of CTLA-4 fused to IgG1, which binds to CD80/86 on antigen-presenting cells, preventing the "second signal" required for T-cell activation. * **Daclizumab (Option C):** This is a monoclonal antibody against the **IL-2 receptor (CD25)**. It was primarily used in multiple sclerosis and transplant rejection (though largely withdrawn from markets due to hepatic toxicity). * **Tocilizumab (Option D):** This is a monoclonal antibody that targets the **IL-6 receptor**. It is commonly used in Rheumatoid Arthritis and Giant Cell Arteritis. **High-Yield Clinical Pearls for NEET-PG:** 1. **TNF-alpha Inhibitors Classification:** * **Fusion Protein:** Etanercept. * **Monoclonal Antibodies:** Infliximab (chimeric), Adalimumab (fully human), Certolizumab, and Golimumab. 2. **Pre-treatment Screening:** Before starting any TNF-alpha inhibitor, patients must be screened for **Latent Tuberculosis** (using PPD or IGRA) and Hepatitis B, as these drugs can cause reactivation. 3. **Drug of Choice:** While Methotrexate remains the first-line DMARD for Rheumatoid Arthritis, TNF inhibitors are added when the response to non-biological DMARDs is inadequate.

Q: Which of the following is NOT characteristic of aspirin-sensitive asthma?

Increased prostaglandins. **Explanation:** Aspirin-sensitive asthma, also known as **Aspirin-Exacerbated Respiratory Disease (AERD)** or **Samter’s Triad**, is a non-allergic hypersensitivity reaction. **Why "Increased Prostaglandins" is the correct answer:** The underlying mechanism of AERD is the **inhibition of the Cyclooxygenase-1 (COX-1) enzyme** by aspirin and other NSAIDs. This inhibition leads to a "shunting" of arachidonic acid metabolism away from the prostaglandin pathway and toward the **Lipoxygenase (LOX) pathway**. This results in: 1. **Decreased** protective prostaglandins (especially PGE2, which normally inhibits inflammation). 2. **Increased** production of **Cysteinyl Leukotrienes** (LTC4, LTD4, LTE4), which are potent bronchoconstrictors and mediators of inflammation. Therefore, prostaglandins are decreased, not increased. **Analysis of Incorrect Options:** * **A & C (Nasal polyposis and Rhinosinusitis):** These are classic components of Samter’s Triad. Patients typically present with chronic rhinosinusitis and bilateral nasal polyps before developing asthma and aspirin sensitivity. * **B (Treatment with inhaled corticosteroids):** Inhaled corticosteroids (ICS) are the mainstay of long-term management for the underlying asthma component of AERD, as they help reduce airway inflammation. **High-Yield Clinical Pearls for NEET-PG:** * **Samter’s Triad:** Asthma + Nasal Polyposis + Aspirin Sensitivity. * **Drug of Choice for Management:** Leukotriene Receptor Antagonists (e.g., **Montelukast, Zafirlukast**) are highly effective because they block the effects of the excess leukotrienes. * **Avoidance:** Patients must avoid all COX-1 inhibiting NSAIDs; however, selective **COX-2 inhibitors** (like Celecoxib) are generally well-tolerated.

Q: Which of the following is a preferential COX-2 inhibitor?

All of the above. **Explanation:** The classification of Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) based on their selectivity for Cyclooxygenase (COX) enzymes is a high-yield topic for NEET-PG. While traditional NSAIDs (like Aspirin or Ibuprofen) are non-selective, certain drugs exhibit a higher affinity for the **COX-2 isoform**, which is induced during inflammation, while sparing the constitutive **COX-1 isoform** (responsible for gastric protection and platelet function). **Why "All of the above" is correct:** NSAIDs are categorized into three main groups regarding COX-2: 1. **Selective COX-2 Inhibitors:** The "Coxibs" (e.g., Celecoxib, Etoricoxib). 2. **Preferential COX-2 Inhibitors:** These drugs inhibit COX-2 more than COX-1 at therapeutic doses, offering a better gastric safety profile than non-selective agents. * **Nimesulide:** A classic preferential inhibitor often used for acute pain. * **Diclofenac:** Though often grouped with non-selective drugs, it shows significant preferential COX-2 activity. * **Aceclofenac:** A prodrug of diclofenac with similar preferential selectivity. * *Other examples include Meloxicam and Etodolac.* **Clinical Pearls for NEET-PG:** * **Gastric Safety:** Preferential and Selective COX-2 inhibitors have a lower risk of peptic ulcers and GI bleeding compared to non-selective NSAIDs. * **Cardiovascular Risk:** Selective and preferential COX-2 inhibition can shift the balance toward Thromboxane A2 (COX-1 mediated), increasing the risk of thrombotic events (MI/Stroke). * **Nimesulide Warning:** It is associated with rare but severe **hepatotoxicity**; its use is banned in children in many countries and restricted in adults. * **Etoricoxib:** Currently the most COX-2 selective agent available.

Q: Which of the following statements is true about Dezocine?

It does not increase histamine release.. **Explanation:** **Dezocine** is a synthetic opioid analgesic with a unique pharmacological profile. It acts as a **mixed agonist-antagonist**, specifically serving as a partial agonist at $\mu$ (mu) receptors and an antagonist at $\kappa$ (kappa) receptors. **Why Option D is Correct:** Unlike morphine and other natural opiates, Dezocine **does not cause significant histamine release**. This makes it clinically advantageous for patients with reactive airway diseases (like asthma) or those prone to hypotension and pruritus, which are common side effects of histamine-releasing opioids. **Analysis of Incorrect Options:** * **Option A:** Dezocine has a **rapid onset of action**, typically within 15–30 minutes after intramuscular administration, making it comparable to or slightly faster than morphine in achieving peak effect. * **Option B:** It is **equipotent to morphine** (10 mg of Dezocine $\approx$ 10 mg of Morphine). It provides effective analgesia for moderate to severe pain. * **Option C:** Dezocine acts primarily on **Opioid receptors** ($\mu$ and $\kappa$), not GABA receptors. Its mechanism involves modulating pain pathways in the central nervous system. **High-Yield Clinical Pearls for NEET-PG:** * **Ceiling Effect:** Like other mixed agonist-antagonists, Dezocine exhibits a "ceiling effect" for respiratory depression, making it safer than pure $\mu$-agonists in overdose scenarios. * **Dependency:** It has a lower abuse potential compared to morphine. * **Contraindication:** Avoid in patients physically dependent on pure opioids, as its antagonist properties can precipitate **withdrawal symptoms**.

Q: Which NSAID undergoes enterohepatic circulation?

Piroxicam. **Explanation:** **Piroxicam** is a long-acting oxicam derivative. The primary reason for its prolonged half-life (approximately 50 hours) is its extensive **enterohepatic circulation**. After being absorbed and metabolized in the liver, a significant portion of the drug is excreted into the bile and subsequently reabsorbed from the gastrointestinal tract back into the systemic circulation. This recycling mechanism allows the drug to maintain therapeutic plasma concentrations for a longer duration, enabling convenient **once-daily dosing**. **Analysis of Incorrect Options:** * **Phenylbutazone:** While it has a long half-life (50–100 hours), this is primarily due to its slow metabolism and high plasma protein binding, rather than significant enterohepatic recycling. * **Aspirin:** It is a short-acting NSAID that is rapidly hydrolyzed to salicylic acid. It follows first-order kinetics at low doses and zero-order kinetics at high doses, but does not undergo enterohepatic circulation. * **Ibuprofen:** A propionic acid derivative with a short half-life (approx. 2 hours). It is rapidly metabolized and excreted in the urine, requiring multiple daily doses. **High-Yield Clinical Pearls for NEET-PG:** * **Indomethacin** is another classic example of an NSAID that undergoes significant enterohepatic circulation (often associated with GI side effects). * **Piroxicam** is associated with a higher risk of gastric ulcers and bleeding compared to other NSAIDs due to its long duration of action. * **Clinical Tip:** Drugs undergoing enterohepatic circulation often show a "second peak" in plasma concentration curves and are more susceptible to interactions with broad-spectrum antibiotics (which disrupt gut flora required for deconjugation).

Q: Aspirin is useful in all the following conditions EXCEPT?

Gout. **Explanation:** The correct answer is **Gout (Option D)**. Aspirin is generally contraindicated in patients with gout because it exhibits a **bimodal effect** on uric acid excretion. At low doses (the most common clinical dosage), aspirin inhibits the organic anion transporters (OAT) in the renal tubules, leading to decreased uric acid secretion [1]. This results in **hyperuricemia**, which can precipitate or worsen an acute gouty attack. While high doses (>5g/day) are uricosuric [3], such doses are clinically intolerable due to toxicity (salicylism) [4]. **Why other options are incorrect:** * **Fever (A):** Aspirin is a classic antipyretic [3]. It inhibits COX enzymes in the hypothalamus, reducing Prostaglandin E2 (PGE2) levels, which resets the thermoregulatory center to normal. (Note: Avoid in children with viral fever due to Reye’s syndrome risk) [5]. * **Post Myocardial Infarction (B):** Low-dose aspirin (75–150 mg) irreversibly inhibits COX-1 in platelets [2], preventing the formation of Thromboxane A2 (TXA2). This provides a potent antiplatelet effect, reducing the risk of recurrent MI and stroke. * **Venous Thrombosis (C):** While anticoagulants (like Heparin/Warfarin) are preferred for DVT, aspirin is used for the prophylaxis of thromboembolic events, especially in post-operative settings or when anticoagulants are contraindicated. **High-Yield Clinical Pearls for NEET-PG:** 1. **Analgesic Asthma:** Aspirin can trigger bronchospasm in sensitive individuals by shifting arachidonic acid metabolism toward the leukotriene pathway (Samter’s Triad). 2. **Zero-Order Kinetics:** At therapeutic/toxic doses, aspirin metabolism shifts from first-order to zero-order kinetics. 3. **Reye’s Syndrome:** Characterized by fulminant hepatic failure and encephalopathy in children using aspirin during viral infections (Varicella/Influenza) [4], [5].

Q: Latanoprost (a prostaglandin F2 alpha analogue) is used in:

Glaucoma. **Explanation:** **Latanoprost** is a Prostaglandin $F_{2\alpha}$ ($PGF_{2\alpha}$) analogue. It is the first-line medical therapy for **Open-Angle Glaucoma** and Ocular Hypertension. **Why Option D is Correct:** Latanoprost acts by increasing the **uveoscleral outflow** of aqueous humor (the unconventional pathway). It reduces intraocular pressure (IOP) by remodeling the extracellular matrix in the ciliary muscle, making it more permeable. Its once-daily dosing and high efficacy make it superior to beta-blockers for long-term management. **Why Other Options are Incorrect:** * **Option A:** **Alprostadil** ($PGE_1$) is used to maintain the patency of the ductus arteriosus in neonates with congenital heart defects. * **Option B:** **Epoprostenol** and **Treprostinil** ($PGI_2$ analogues) are used in the management of Pulmonary Arterial Hypertension due to their potent vasodilatory effects. * **Option C:** **Misoprostol** ($PGE_1$ analogue) is used for gastric mucosal protection, especially to prevent NSAID-induced peptic ulcers, by increasing bicarbonate and mucus secretion. **High-Yield Clinical Pearls for NEET-PG:** 1. **Side Effects:** The most characteristic side effects of Latanoprost include **increased iris pigmentation** (permanent), **hypertrichosis** (increased eyelash growth/thickness), and **prostaglandin-associated periorbitopathy** (sunken eyes). 2. **Contraindication:** It should be avoided in patients with active **uveitis** or **cystoid macular edema (CME)** as it may exacerbate inflammation. 3. **Storage:** Latanoprost eye drops usually require refrigeration ($2\text{--}8^\circ\text{C}$) before opening to maintain stability. 4. **Other Analogues:** Bimatoprost and Travoprost are other $PGF_{2\alpha}$ analogues used in glaucoma.

Question 1

Which of the following is a TNF-alpha inhibitor?

Accepted Answer

Etanercept

Answer

Abatacept

Answer

Daclizumab

Answer

Toclizumab

Question 2

Which of the following is NOT characteristic of aspirin-sensitive asthma?

Accepted Answer

Increased prostaglandins

Answer

Nasal polyposis

Answer

Treatment with inhaled corticosteroids

Answer

Rhinosinusitis

Question 3

Which of the following is a preferential COX-2 inhibitor?

Accepted Answer

All of the above

Answer

Nimesulide

Answer

Diclofenac

Answer

Aceclofenac

Question 4

Anaphylactic reactions caused by NSAIDs are true for all statements below EXCEPT?

Accepted Answer

COX-2 inhibitors are safe

Answer

Caused by all NSAIDs

Answer

Related to a hypersensitivity reaction

Answer

Not related to inhibition of COX

Question 5

Which of the following is true regarding the cyclo-oxygenase-1 (COX-1) isoenzyme?

Accepted Answer

Is the predominant mode of action of Indomethacin

Answer

Is increased by inflammation

Answer

Is increased by lipopolysaccharide, a Gram-negative endotoxin

Answer

Is not involved in gastric mucosal protection

Question 6

Which of the following statements is true about Dezocine?

Accepted Answer

It does not increase histamine release.

Answer

It is slower acting than morphine.

Answer

It is less potent than morphine.

Answer

It acts on GABA receptors.

Question 7

Which NSAID undergoes enterohepatic circulation?

Accepted Answer

Piroxicam

Answer

Phenylbutazone

Answer

Aspirin

Answer

Ibuprofen

Question 8

Aspirin is useful in all the following conditions EXCEPT?

Accepted Answer

Gout

Answer

Fever

Answer

Post myocardial infarction

Answer

Venous thrombosis

Question 9

Aspirin causes mucosal injury by which mechanism?

Accepted Answer

Ion trapping

Answer

Ionization in the stomach

Answer

Biotransformation

Answer

Increased H+ secretion

Question 10

Latanoprost (a prostaglandin F2 alpha analogue) is used in:

Accepted Answer

Glaucoma

Answer

Maintenance of ductus arteriosus

Answer

Pulmonary hypertension

Answer

Gastric mucosal protection

Analgesics and Anti-inflammatory Drugs — MCQs

Analgesics and Anti-inflammatory Drugs — MCQs

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