Analgesics and Anti-inflammatory Drugs Practice Questions

Q: The mu (u) opioid receptor is responsible for which of the following effects, except?

bronchodilation. **Explanation:** The **mu (μ) opioid receptor** is the primary mediator for most of the clinical and adverse effects of opioid analgesics (like Morphine). **Why "Bronchodilation" is the correct answer:** Opioids do **not** cause bronchodilation. In fact, they can cause **bronchoconstriction**. This occurs through two mechanisms: 1. **Central Respiratory Depression:** Mu receptors in the brainstem decrease the sensitivity of the respiratory center to CO2. 2. **Histamine Release:** Certain opioids (especially Morphine) trigger mast cell degranulation, leading to histamine release, which causes bronchospasm. Therefore, opioids should be used with caution in patients with bronchial asthma. **Analysis of Incorrect Options:** * **Miosis (A):** Mu and Kappa receptors stimulate the **Edinger-Westphal nucleus** (oculomotor nerve), leading to pupillary constriction (pinpoint pupils). This is a classic sign of opioid overdose. * **Bradycardia (B):** Opioids generally cause vagal stimulation and have a depressant effect on the sinoatrial (SA) node, leading to a decrease in heart rate. * **Hypothermia (C):** Mu receptor activation interferes with the hypothalamic thermoregulatory mechanisms, typically leading to a decrease in body temperature (though effects can vary with dosage and species). **High-Yield Clinical Pearls for NEET-PG:** * **Miosis & Constipation:** These are the two effects of opioids to which **tolerance never develops**. * **Triad of Opioid Overdose:** Coma, Pinpoint pupil, and Respiratory depression. * **Antidote:** **Naloxone** is the drug of choice for acute opioid poisoning (competitive antagonist at all opioid receptors). * **Exception:** Pethidine (Meperidine) is an opioid that causes **mydriasis** (due to its atropine-like action) rather than miosis.

Q: Aspirin produces all of the following effects except?

Constipation. **Explanation:** Aspirin (Acetylsalicylic acid) is a non-selective, irreversible inhibitor of Cyclooxygenase (COX-1 and COX-2) enzymes. The correct answer is **Constipation**, as Aspirin and other NSAIDs are more commonly associated with **diarrhea** or dyspepsia rather than constipation (which is a classic side effect of Opioid analgesics). **Why the other options are incorrect:** * **Frank gastric bleeding:** Aspirin inhibits COX-1, which is responsible for synthesizing protective prostaglandins ($PGE_2$ and $PGI_2$) in the gastric mucosa. Loss of these prostaglandins leads to increased acid secretion, reduced mucus production, and direct mucosal irritation, resulting in erosive gastritis and frank GI bleeding. * **Prolonged prothrombin time:** In high doses, Aspirin interferes with the synthesis of clotting factors (specifically Vitamin K-dependent factors) in the liver, leading to a functional hypoprothrombinemia and a prolonged Prothrombin Time (PT). * **Platelet dysfunction:** Aspirin irreversibly acetylates platelet COX-1, inhibiting the production of **Thromboxane $A_2$ ($TXA_2$)**, a potent platelet aggregator. Since platelets cannot synthesize new enzymes, this effect lasts for the entire lifespan of the platelet (approx. 7–10 days). **High-Yield Clinical Pearls for NEET-PG:** * **Zero-order kinetics:** Aspirin follows first-order kinetics at low doses but shifts to zero-order (saturation) kinetics at anti-inflammatory/toxic doses. * **Reye’s Syndrome:** Aspirin is contraindicated in children with viral infections (Flu/Varicella) due to the risk of fulminant hepatic failure and encephalopathy. * **Aspirin Triad (Samter’s Triad):** Asthma, Nasal polyposis, and Aspirin hypersensitivity. * **Toxicity:** Salicylism presents with **Tinnitus** (earliest sign), respiratory alkalosis, and metabolic acidosis. Management involves urinary alkalinization with Sodium Bicarbonate.

Q: Which of the following drugs does not possess any agonist action?

Nalmefene. ### Explanation The question tests the classification of opioid ligands based on their receptor activity. Opioids are categorized as pure agonists, mixed agonist-antagonists, or pure antagonists. **1. Why Nalmefene is the correct answer:** Nalmefene is a **pure opioid antagonist**. It is a derivative of naltrexone and acts as a competitive antagonist at $\mu$ (mu) and $\delta$ (delta) receptors, and a partial antagonist at $\kappa$ (kappa) receptors. Unlike the other options, it possesses **zero intrinsic activity** (no agonist action) at any opioid receptor. It is primarily used for treating alcohol dependence and opioid overdose due to its longer half-life compared to naloxone. **2. Why the other options are incorrect:** * **Buprenorphine:** It is a **partial $\mu$-agonist** and a $\kappa$-antagonist. Because it has partial agonist activity, it can precipitate withdrawal in opioid-dependent individuals but provides analgesia on its own. * **Butorphanol:** It is a **$\kappa$-agonist** and a $\mu$-antagonist (or partial agonist). Its primary analgesic effect is mediated through kappa receptors. * **Nalbuphine:** Similar to butorphanol, it acts as a **strong $\kappa$-agonist** and a $\mu$-antagonist. It is often used for obstetric analgesia. **3. High-Yield Clinical Pearls for NEET-PG:** * **Pure Antagonists:** Naloxone (IV, short-acting), Naltrexone (Oral, long-acting), and Nalmefene (IV/Oral, longest-acting). * **Buprenorphine** exhibits a "ceiling effect" for respiratory depression, making it safer in overdose, and is used in opioid substitution therapy. * **Mixed Agonist-Antagonists** (Butorphanol, Nalbuphine, Pentazocine) can precipitate withdrawal symptoms if administered to a patient already on a pure $\mu$-agonist like Morphine. * **Naloxone** is the drug of choice for acute opioid poisoning.

Q: Which of the following drugs does NOT cause hyperuricemia?

Probenecid. ### Explanation The correct answer is **Probenecid**. **1. Why Probenecid is the correct answer:** Hyperuricemia (elevated serum uric acid) occurs when drugs either increase uric acid production or, more commonly, decrease its renal excretion. **Probenecid** is a **uricosuric agent**. It works by inhibiting the **URAT1** transporter in the proximal convoluted tubule, which prevents the reabsorption of uric acid from the urine back into the blood. Consequently, it *lowers* serum uric acid levels and is used in the chronic management of gout. **2. Why the other options are incorrect:** * **Thiazide Diuretics:** These drugs cause hyperuricemia by two mechanisms: they compete with uric acid for the organic acid secretory system in the kidney and cause volume depletion, which enhances proximal tubular reabsorption of uric acid. * **Pyrazinamide:** A key component of anti-tubercular therapy (ATT), its metabolite (pyrazinoic acid) inhibits the secretion of uric acid into the tubular lumen, frequently leading to asymptomatic hyperuricemia. * **Ethambutol:** Another ATT drug that interferes with the renal excretion of urates, often causing a rise in serum uric acid levels. **3. Clinical Pearls for NEET-PG:** * **Mnemonic for Hyperuricemia (CANT):** **C**yclosporine, **A**lcohol, **N**iacin, **T**hiazides/Teriparatide. * **Anti-TB Drugs:** Both Pyrazinamide and Ethambutol cause hyperuricemia; however, Pyrazinamide is a more potent inducer. * **Aspirin Paradox:** Low-dose aspirin ( 4g/day) is uricosuric. * **Drug of Choice:** For acute gout, NSAIDs are preferred; for chronic gout, Allopurinol (Xanthine oxidase inhibitor) is the first-line agent.

Q: Which newer monoclonal antibody is approved for rheumatoid arthritis?

Sarilumab. **Explanation:** **Correct Answer: D. Sarilumab** **Mechanism and Rationale:** Sarilumab is a human monoclonal antibody that acts as an **Interleukin-6 (IL-6) receptor antagonist**. IL-6 is a pro-inflammatory cytokine that plays a central role in the pathogenesis of Rheumatoid Arthritis (RA) by mediating joint inflammation and destruction. By binding to both soluble and membrane-bound IL-6 receptors, Sarilumab inhibits IL-6-mediated signaling. It is approved for patients with moderate-to-severe RA who have had an inadequate response or intolerance to one or more disease-modifying antirheumatic drugs (DMARDs), such as Methotrexate. **Analysis of Incorrect Options:** * **A, B, and C (Durvalumab, Pembrolizumab, Nivolumab):** These are all **Immune Checkpoint Inhibitors** used in Oncology. * **Pembrolizumab and Nivolumab** are PD-1 (Programmed Death-1) inhibitors. * **Durvalumab** is a PD-L1 inhibitor. * These drugs "release the brakes" on the immune system to treat cancers like melanoma and non-small cell lung cancer; they are not used for autoimmune conditions like RA. **High-Yield Clinical Pearls for NEET-PG:** * **IL-6 Inhibitors:** Apart from Sarilumab, **Tocilizumab** is the other major IL-6 receptor antagonist used in RA and Giant Cell Arteritis. * **TNF-α Inhibitors:** Remember the "Big 5"—Infliximab, Adalimumab, Etanercept, Certolizumab, and Golimumab. * **B-cell Depletion:** **Rituximab** (Anti-CD20) is used in RA if TNF inhibitors fail. * **T-cell Costimulation Blocker:** **Abatacept** (CTLA-4 Ig). * **JAK Inhibitors (Oral):** Tofacitinib and Baricitinib are non-monoclonal antibody targeted therapies for RA.

Q: All of the following are indications for eicosanoids or their inhibitors EXCEPT?

Essential hypertension. **Explanation:** The correct answer is **Essential Hypertension**. While eicosanoids (prostaglandins) have vasodilatory properties, they are not used in the clinical management of essential hypertension due to their short half-life, significant side effects, and the availability of more effective antihypertensive classes (e.g., ACE inhibitors, CCBs). In fact, NSAIDs (which inhibit prostaglandin synthesis) can actually worsen hypertension by causing sodium and water retention. **Analysis of Options:** * **Abortion:** Prostaglandin E1 (Misoprostol) and F2α (Carboprost) analogues are standard medical indications for inducing uterine contractions to terminate pregnancy or manage postpartum hemorrhage. * **Patent Ductus Arteriosus (PDA):** NSAIDs like **Indomethacin** or **Ibuprofen** (inhibitors of eicosanoid synthesis) are the treatment of choice to close a PDA in neonates by inhibiting the vasodilatory effect of PGE2. * **Transposition of the Great Arteries (TGA):** In cyanotic heart diseases where survival depends on a shunt, **Alprostadil (PGE1)** is administered to keep the ductus arteriosus open (maintain patency) until surgical intervention is possible. **High-Yield Clinical Pearls for NEET-PG:** * **PGE1 (Alprostadil):** Used for maintaining PDA in TGA and for erectile dysfunction. * **PGE1 Analogue (Misoprostol):** Used for NSAID-induced peptic ulcers and medical abortion. * **PGF2α (Latanoprost):** First-line treatment for Open-Angle Glaucoma (increases uveoscleral outflow). * **PGI2 (Epoprostenol):** Used in Pulmonary Arterial Hypertension. * **Aspirin:** The only irreversible COX inhibitor; used for cardioprotection at low doses.

Q: Which of the following statements about NSAIDs is false?

NSAIDs are useful in neuropathic pain.. **Explanation:** **Why Option C is the correct (False) statement:** NSAIDs primarily work by inhibiting the enzyme Cyclooxygenase (COX), thereby reducing the synthesis of prostaglandins which mediate peripheral inflammation and nociception. **Neuropathic pain**, however, is caused by a lesion or disease of the somatosensory nervous system (e.g., Diabetic Neuropathy, Post-herpetic neuralgia). It does not respond well to conventional analgesics like NSAIDs or Opioids. The first-line treatments for neuropathic pain are **Gabapentinoids** (Gabapentin, Pregabalin), **TCAs** (Amitriptyline), or **SNRIs** (Duloxetine). **Analysis of other options:** * **Option A (True):** NSAIDs inhibit the synthesis of vasodilatory prostaglandins (PGE2 and PGI2) in the kidneys. This leads to sodium and water retention and blunts the pressure-natriuresis response, thereby interfering with the efficacy of diuretics and ACE inhibitors. * **Option B (True):** Prostaglandins maintain renal perfusion by dilating the afferent arteriole. By inhibiting these, NSAIDs cause vasoconstriction, which can lead to **Acute Kidney Injury (AKI)**, especially in patients with pre-existing renal disease, CCF, or dehydration. * **Option D (True):** Several NSAIDs like Diclofenac, Ketoprofen, and Ibuprofen are available as topical gels or patches. These provide localized pain relief with significantly lower systemic absorption and fewer GI side effects. **High-Yield Clinical Pearls for NEET-PG:** * **Triple Whammy:** The dangerous combination of an **NSAID + ACE Inhibitor + Diuretic** which significantly increases the risk of AKI. * **Aspirin:** The only NSAID that irreversibly inhibits COX-1 (via acetylation). * **Analgesic Nephropathy:** Chronic use of NSAID combinations can lead to **Renal Papillary Necrosis** and chronic interstitial nephritis.

Q: Anakinra, used in the treatment of rheumatoid arthritis, is which of the following biological agents?

Interleukin-1 (IL-1). **Explanation:** **Anakinra** is a recombinant, non-glycosylated form of the human **Interleukin-1 receptor antagonist (IL-1Ra)**. In the pathogenesis of Rheumatoid Arthritis (RA), IL-1 is a key pro-inflammatory cytokine that mediates cartilage degradation and bone resorption. Anakinra works by competitively inhibiting the binding of IL-1 (both IL-1α and IL-1β) to its type I receptor, thereby neutralizing its inflammatory effects. **Analysis of Options:** * **Option A (Correct):** Anakinra is specifically designed to target the **IL-1** pathway. It is used in RA patients who have failed one or more Disease-Modifying Antirheumatic Drugs (DMARDs). * **Option B & C (Incorrect):** Drugs targeting **TNF-alpha** include Etanercept (decoy receptor), Infliximab, and Adalimumab (monoclonal antibodies). TNF-beta (Lymphotoxin-alpha) is not the primary target of these common biological DMARDs. * **Option D (Incorrect):** **IL-7** is involved in T-cell homeostasis but is not a target for currently approved biological therapies in the management of Rheumatoid Arthritis. **High-Yield Clinical Pearls for NEET-PG:** * **Canakinumab:** A human monoclonal antibody against **IL-1β** (used in Gout and Periodic Fever Syndromes). * **Rilonacept:** An **IL-1 trap** (ligand-binding domain of IL-1 receptor) used in Cryopyrin-Associated Periodic Syndromes (CAPS). * **Key Side Effect:** Injection site reactions are common. Importantly, Anakinra should **never** be combined with TNF-inhibitors due to a significantly increased risk of serious infections. * **Other Biologicals:** Tocilizumab (IL-6 inhibitor), Abatacept (CTLA-4 analog/T-cell costimulation blocker), and Rituximab (Anti-CD20).

Question 1

The mu (u) opioid receptor is responsible for which of the following effects, except?

Accepted Answer

bronchodilation

Answer

miosis

Answer

bradycardia

Answer

hypothermia

Question 2

Aspirin produces all of the following effects except?

Accepted Answer

Constipation

Answer

Frank gastric bleeding

Answer

Prolonged prothrombin time

Answer

Platelet dysfunction

Question 3

Which of the following drugs does not possess any agonist action?

Accepted Answer

Nalmefene

Answer

Buprenorphine

Answer

Butorphanol

Answer

Nalbuphine

Question 4

Which of the following statements is true of ketorolac?

Accepted Answer

Its analgesic efficacy is equal to morphine in postoperative pain

Answer

Has potent anti-inflammatory activity

Answer

Is used as preanesthetic analgesic

Answer

It interacts with opioid receptors

Question 5

Which of the following drugs does NOT cause hyperuricemia?

Accepted Answer

Probenecid

Answer

Thiazide

Answer

Pyrazinamide

Answer

Ethambutol

Question 6

Which newer monoclonal antibody is approved for rheumatoid arthritis?

Accepted Answer

Sarilumab

Answer

Durvalumab

Answer

Pembrolizumab

Answer

Nivolumab

Question 7

All of the following are indications for eicosanoids or their inhibitors EXCEPT?

Accepted Answer

Essential hypertension

Answer

Abortion

Answer

Patent ductus arteriosus

Answer

Transposition of the great arteries

Question 8

Which of the following statements about NSAIDs is false?

Accepted Answer

NSAIDs are useful in neuropathic pain.

Answer

They interfere with the antihypertensive effect of diuretics.

Answer

NSAIDs should be avoided in renal disease as they can cause nephrotoxicity.

Answer

Many NSAIDs can be used topically.

Question 9

Anakinra, used in the treatment of rheumatoid arthritis, is which of the following biological agents?

Accepted Answer

Interleukin-1 (IL-1)

Answer

Tumor Necrosis Factor alpha (TNF-alpha)

Answer

Tumor Necrosis Factor beta (TNF-beta)

Answer

Interleukin-7 (IL-7)

Question 10

All of the following actions of aspirin are mediated by inhibition of prostaglandin synthesis EXCEPT:

Accepted Answer

Hyperventilation

Answer

Analgesia

Answer

Closure of patent ductus arteriosus

Answer

Bleeding tendency

Analgesics and Anti-inflammatory Drugs — MCQs

Analgesics and Anti-inflammatory Drugs — MCQs

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