Analgesics and Anti-inflammatory Drugs Practice Questions

Q: Which of the following groups of drugs is not a first-line treatment in the management of chronic pain?

Dopamine antagonists. **Explanation:** The management of chronic pain often requires a multimodal approach targeting different pathways of pain transmission and modulation. **Dopamine antagonists** (Option C) are primarily used as antipsychotics or antiemetics (e.g., Haloperidol, Metoclopramide). They are **not** considered first-line treatments for chronic pain because they do not possess intrinsic analgesic properties and are associated with significant side effects like extrapyramidal symptoms and tardive dyskinesia. **Analysis of other options:** * **Opioids (Option A):** While their long-term use is controversial due to dependence risks, they remain a potent class of analgesics used for severe chronic pain (e.g., cancer pain) that is refractory to other treatments. * **Antiepileptics (Option B):** Drugs like **Gabapentin and Pregabalin** are first-line agents for neuropathic pain. They work by binding to the $\alpha_2\delta$ subunit of voltage-gated calcium channels, reducing the release of excitatory neurotransmitters. * **Serotonergic drugs (Option D):** This group includes SNRIs (e.g., **Duloxetine**) and TCAs (e.g., **Amitriptyline**). They are first-line for chronic conditions like fibromyalgia and diabetic neuropathy because they enhance descending inhibitory pain pathways by increasing synaptic levels of Serotonin and Norepinephrine. **High-Yield Clinical Pearls for NEET-PG:** * **WHO Pain Relief Ladder:** Step 1 (Non-opioids), Step 2 (Weak opioids), Step 3 (Strong opioids). Adjuvants (Antiepileptics/Antidepressants) can be added at any step. * **Drug of Choice (DOC):** For Trigeminal Neuralgia is **Carbamazepine**. * **DOC for Post-herpetic Neuralgia:** Gabapentin or Pregabalin. * **Duloxetine** is specifically FDA-approved for chronic musculoskeletal pain and fibromyalgia.

Q: When activated by beta-adrenergic receptors, which enzyme does the associated G protein activate?

Adenylate cyclase. **Explanation:** **Correct Option: B. Adenylate cyclase** Beta-adrenergic receptors ($\beta_1, \beta_2, \beta_3$) are classic examples of **G-protein coupled receptors (GPCRs)** coupled specifically to the **Gs (stimulatory) protein**. When a ligand (like epinephrine) binds to the receptor, the Gs-alpha subunit dissociates and activates the transmembrane enzyme **Adenylate cyclase**. This enzyme catalyzes the conversion of ATP into **cyclic AMP (cAMP)**, which acts as a second messenger to activate Protein Kinase A (PKA), leading to various physiological effects like bronchodilation and increased heart rate. **Why other options are incorrect:** * **A & C: Phospholipase C and Protein Kinase C:** These are components of the **Gq protein** signaling pathway. Receptors like $\alpha_1$, $M_1$, and $M_3$ activate Phospholipase C, which cleaves PIP2 into IP3 and DAG; DAG then activates Protein Kinase C. * **D: Converts GDP to GTP:** This is a common point of confusion. The G-protein does not *convert* GDP to GTP; rather, the activation of the receptor triggers the **exchange** of bound GDP for a new molecule of GTP on the alpha subunit. **NEET-PG High-Yield Pearls:** * **Gs Pathway (↑ cAMP):** All $\beta$ receptors, $D_1$, $H_2$, $V_2$. * **Gi Pathway (↓ cAMP):** $\alpha_2$, $M_2$, $D_2$. * **Gq Pathway (↑ IP3/DAG):** $\alpha_1$, $M_1$, $M_3$, $V_1$. * **Clinical Correlation:** In heart failure, $\beta_1$ stimulation via Adenylate cyclase increases contractility (inotropy), while in asthma, $\beta_2$ stimulation via the same pathway causes smooth muscle relaxation.

Q: Canakinumab is a monoclonal antibody against:

IL-1. **Explanation:** **Canakinumab** is a high-affinity, human monoclonal antibody specifically directed against **Interleukin-1 beta (IL-1β)**. By binding to IL-1β, it prevents the cytokine from interacting with its receptors, thereby neutralizing the pro-inflammatory cascade. * **Why Option A is Correct:** Canakinumab belongs to the class of IL-1 inhibitors. It is primarily used in the management of **Systemic Juvenile Idiopathic Arthritis (sJIA)** and **Cryopyrin-Associated Periodic Syndromes (CAPS)**, such as Muckle-Wells syndrome, where IL-1 overproduction is the primary driver of inflammation. * **Why Other Options are Incorrect:** * **IL-2:** Targeted by drugs like **Basiliximab** and **Daclizumab** (IL-2 receptor antagonists), used mainly in transplant medicine to prevent organ rejection. * **IL-5:** Targeted by **Mepolizumab** and **Reslizumab** (while Benralizumab targets the IL-5 receptor). These are used in the treatment of severe eosinophilic asthma. * **IL-6:** Targeted by **Tocilizumab** and **Sarilumab**. These are commonly used in Rheumatoid Arthritis and were notable during COVID-19 management for cytokine storm. **High-Yield Clinical Pearls for NEET-PG:** 1. **IL-1 Inhibitor Trio:** Remember **Anakinra** (Recombinant IL-1 receptor antagonist), **Canakinumab** (Monoclonal antibody against IL-1β), and **Rilonacept** (IL-1 trap). 2. **CANTOS Trial:** Canakinumab was famously studied for reducing cardiovascular risk by lowering systemic inflammation (CRP levels), though it is not a primary indication due to cost and infection risk. 3. **Key Indication:** It is the drug of choice for **Gouty Arthritis** in patients who cannot tolerate NSAIDs or Colchicine.

Q: Aspirin is contraindicated in which of the following conditions?

Peptic ulcer. **Explanation:** Aspirin (Acetylsalicylic acid) is a non-selective, irreversible inhibitor of the **Cyclooxygenase (COX)** enzymes. Its contraindication in peptic ulcer disease is rooted in its mechanism of action: 1. **Why Peptic Ulcer is Correct:** Aspirin inhibits **COX-1**, the constitutive enzyme responsible for synthesizing "housekeeping" prostaglandins (PGE2 and PGI2) in the gastric mucosa. These prostaglandins are vital for cytoprotection as they increase bicarbonate secretion, enhance mucosal blood flow, and stimulate mucus production. By inhibiting COX-1, Aspirin reduces these protective factors. Furthermore, as an organic acid, Aspirin exerts a direct irritant effect on the gastric lining, significantly increasing the risk of gastric erosions, ulceration, and GI bleeding. 2. **Why Other Options are Incorrect:** * **Fever & Myalgia:** Aspirin is an effective antipyretic and analgesic. It reduces fever by inhibiting PGE2 synthesis in the hypothalamus and relieves pain by blocking peripheral pain sensitization. (Note: It is avoided in children with viral fever to prevent Reye’s syndrome). * **Unstable Angina:** Aspirin is actually a **standard of care** here. At low doses (75–150 mg), it irreversibly inhibits thromboxane A2 (TXA2) in platelets, providing an anti-aggregatory effect that prevents coronary thrombosis. **High-Yield Clinical Pearls for NEET-PG:** * **Aspirin Triad (Samter’s Triad):** Asthma, Nasal polyposis, and Aspirin hypersensitivity. * **Zero-order Kinetics:** Aspirin follows zero-order elimination at high/toxic doses. * **Reye’s Syndrome:** Characterized by encephalopathy and fatty liver; occurs when Aspirin is given to children with viral infections (Varicella/Influenza). * **Toxicity:** Salicylism presents with **tinnitus** (earliest sign), respiratory alkalosis, and metabolic acidosis.

Question 1

Which of the following groups of drugs is not a first-line treatment in the management of chronic pain?

Accepted Answer

Dopamine antagonists

Answer

Opioids

Answer

Antiepileptics

Answer

Serotonergic drugs

Question 2

When activated by beta-adrenergic receptors, which enzyme does the associated G protein activate?

Accepted Answer

Adenylate cyclase

Answer

Phospholipase C

Answer

Protein kinase C

Answer

Converts guanosine diphosphate (GDP) to guanosine triphosphate (GTP)

Question 3

What is the most common adverse effect of colchicine?

Accepted Answer

Diarrhea

Answer

Peptic ulcer

Answer

Dyspepsia

Answer

Pulmonary fibrosis

Question 4

Which cyclooxygenase plays a role in maintaining gastrointestinal mucosal integrity?

Accepted Answer

Cyclooxygenase 1

Answer

Cyclooxygenase 2

Answer

Cyclooxygenase 3

Answer

Cyclooxygenase 4

Question 5

Which of the following H1 blockers has high anticholinergic activity?

Accepted Answer

Chlorpheniramine

Answer

Cetirizine

Answer

Fexofenadine

Answer

Astemizole

Question 6

Which NSAID has the least anti-inflammatory action?

Accepted Answer

Paracetamol

Answer

Indomethacin

Answer

Ketorolac

Answer

Ibuprofen

Question 7

What is the mechanism of action of tacrolimus?

Accepted Answer

Both inhibition of transcription of IL 2 and inhibition of calcineurin

Answer

Inhibition of transcription of IL 2

Answer

Inhibition of translation of IL 2

Answer

Inhibition of calcineurin

Question 8

Canakinumab is a monoclonal antibody against:

Accepted Answer

IL-1

Answer

IL-2

Answer

IL-5

Answer

IL-6

Question 9

A 44-year-old businessman presents with a markedly inflamed and painful right great toe. He reports increasing pain in his right foot during a recent flight home after a convention. Physical examination reveals swelling and erythema of the right great toe, along with small nodules on the external ears. Aspiration of the metatarsophalangeal joint of the affected toe shows needle-shaped, negatively birefringent crystals. Which of the following agents would provide the most immediate relief for this patient?

Accepted Answer

Colchicine

Answer

Allopurinol

Answer

Aspirin

Answer

Probenecid

Question 10

Aspirin is contraindicated in which of the following conditions?

Accepted Answer

Peptic ulcer

Answer

Fever

Answer

Unstable angina

Answer

Myalgia

Analgesics and Anti-inflammatory Drugs — MCQs

Analgesics and Anti-inflammatory Drugs — MCQs

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