Analgesics and Anti-inflammatory Drugs Practice Questions

Q: Which drug is commonly used for outpatient department (OPD) analgesia?

Paracetamol. ***Paracetamol*** - It is a widely used and generally **safe analgesic** and antipyretic often prescribed for mild to moderate pain in an outpatient setting. - Its favorable side effect profile and availability as an **over-the-counter (OTC)** medication make it a first-choice drug for many common pain conditions. *Diclofenac* - While it is an effective NSAID used for pain and inflammation, its use can be associated with **gastrointestinal side effects** like ulcers and bleeding, as well as cardiovascular risks. - It is often reserved for more significant inflammatory pain or when other analgesics are insufficient, and may require more careful monitoring in an outpatient setting. *Ibuprofen* - Similar to diclofenac, Ibuprofen is an **NSAID** which is effective for pain and inflammation. However, it also carries risks of **gastrointestinal irritation** and renal side effects, especially with prolonged use or in certain patient populations. - While available OTC, its use for routine outpatient analgesia may be less preferred than paracetamol in some cases due to its GI and renal side effect profile. *Tramadol* - Tramadol is a **central acting opioid analgesic** with a higher potential for side effects such as nausea, dizziness, constipation, and the risk of dependence or abuse. - It is typically reserved for moderate to severe pain that is not adequately managed by non-opioid analgesics, and its prescription often involves more stringent monitoring than paracetamol.

Q: What is the mode of action of azathioprine?

T-cell blockade. ***T-cell blockade*** - Azathioprine is a **prodrug** that is metabolized into **6-mercaptopurine (6-MP)**, which then interferes with **purine synthesis** [1, 2]. - This interference inhibits the proliferation of **lymphocytes**, particularly **T-cells**, thereby blocking their immune response. *↑ IL-2* - An increase in **IL-2 (interleukin-2)** production would lead to enhanced T-cell proliferation and activity, which is the opposite effect of azathioprine. - **IL-2** is crucial for T-cell growth, differentiation, and survival, so drugs that increase it would boost, not suppress, the immune system. *Decreased lymphophagocytic activity* - This statement is not the primary mode of action of azathioprine. The drug's main effect is on the **synthesis of DNA and RNA** in rapidly dividing cells, including lymphocytes. - While immune suppression can indirectly affect various immune cell functions, the direct mechanism is not primarily a decrease in phagocytosis by lymphocytes. *Wide-spread antitumor activity* - Although 6-mercaptopurine, the active metabolite of azathioprine, is used in combination chemotherapy for some **hematological malignancies**, azathioprine itself is primarily known as an **immunosuppressant** in conditions like **autoimmune diseases** and **transplant rejection**. - Its antitumor activity is not typically described as "wide-spread," and its predominant use in pharmacology is for immune modulation.

Q: Which enzyme is irreversibly inhibited by aspirin?

Cyclooxygenase. ***Cyclooxygenase*** - **Aspirin** irreversibly inhibits **cyclooxygenase (COX-1 and COX-2)** by acetylating a serine residue in the enzyme's active site. - This irreversible inhibition prevents the production of **prostaglandins, thromboxane**, and **prostacyclin**, thereby reducing inflammation, pain, fever, and platelet aggregation. *Lipooxygenase* - **Lipooxygenase** is involved in the synthesis of **leukotrienes**, which are mediators of inflammation and allergic responses. - Aspirin does not directly inhibit lipooxygenase; rather, it primarily targets the COX pathway. *Thromboxane synthase* - **Thromboxane synthase** is an enzyme downstream of COX, responsible for converting prostaglandin H2 into **thromboxane A2**. - While aspirin's effect on platelet aggregation is due to reduced thromboxane A2 synthesis via COX inhibition, it does not directly inhibit thromboxane synthase itself. *Phospholipase* - **Phospholipase A2** is responsible for releasing **arachidonic acid** from cell membrane phospholipids, which is the initial step in both the cyclooxygenase and lipooxygenase pathways. - Aspirin does not directly inhibit phospholipase A2; its action occurs later in the cascade.

Q: What is the classification of Buprenorphine in terms of its action on opioid receptors?

Partial agonist. ***Partial agonist*** - **Buprenorphine** acts as a **partial agonist** at the **mu-opioid receptor**, meaning it binds to the receptor and produces some but not all of the effects of full opioid agonists. - This property contributes to its **ceiling effect** for respiratory depression and analgesic effects, making it safer in overdose compared to full agonists. - It has **high receptor affinity** but **lower intrinsic activity** compared to full agonists. *Pure agonist* - A **pure agonist** would fully activate opioid receptors, producing the maximum possible effect at the receptor. - Examples include **morphine** and **fentanyl**, which carry a higher risk of respiratory depression and overdose at higher doses. - These lack the ceiling effect seen with buprenorphine. *Pure antagonist* - A **pure antagonist** would block opioid receptors without activating them, reversing or preventing the effects of agonists. - An example is **naloxone**, which is used to treat opioid overdose by competitive inhibition. *Mixed agonist-antagonist* - **Mixed agonist-antagonists** (e.g., **pentazocine**, **nalbuphine**) act as agonists at some opioid receptors (kappa) and antagonists at others (mu). - Unlike buprenorphine, which is a partial agonist at mu receptors, mixed agonist-antagonists have different actions at different receptor subtypes. - They can precipitate withdrawal in opioid-dependent patients.

Q: Which of the following nonsteroidal anti-inflammatory drugs (NSAIDs) has good tissue penetrability with a concentration in synovial fluid?

Diclofenac sodium. ***Diclofenac sodium*** - **Diclofenac** is known for its excellent **tissue penetration**, achieving concentrations in **synovial fluid that approach or exceed plasma levels** within hours of administration. - This **rapid and efficient synovial accumulation** makes it particularly effective for **acute inflammatory joint conditions** such as rheumatoid arthritis and osteoarthritis. - Its **favorable pharmacokinetic profile** combines good penetration with relatively rapid onset of action in joint tissues. *Ketorolac* - While a potent NSAID often used for **acute pain management**, ketorolac does not specifically demonstrate superior synovial fluid penetration compared to other NSAIDs. - It has a relatively **short half-life** and is typically limited to **short-term use** (≤5 days) due to increased risk of adverse effects with prolonged administration. *Piroxicam* - **Piroxicam** does achieve good synovial fluid concentrations with a very **long synovial half-life** due to its overall prolonged elimination. - However, the question specifically asks about "good tissue penetrability with concentration," and **diclofenac** is more characteristically cited for its **rapid synovial penetration** and accumulation. - Piroxicam's main advantage is **once-daily dosing** due to its long plasma half-life, rather than superior initial penetration. *Sulindac* - **Sulindac** is a **prodrug** requiring hepatic conversion to its active sulfide metabolite. - Known for potential **renal-sparing effects** in some patients, but does not demonstrate preferential or superior synovial fluid accumulation compared to diclofenac. - Its prodrug nature may result in less predictable synovial fluid concentrations.

Q: Which drug is known to inhibit both cyclooxygenase and lipoxygenase enzymes?

BW755. ***BW755*** - **BW755** is an experimental drug that has been shown to inhibit both the **cyclooxygenase (COX)** and **lipoxygenase (LOX)** pathways. - This dual inhibition prevents the synthesis of both **prostaglandins** and **leukotrienes**, offering a broader anti-inflammatory effect. - Due to dual pathway inhibition, it has theoretical advantages over conventional NSAIDs but is not in clinical use. *Aspirin* - **Aspirin** primarily inhibits **cyclooxygenase (COX) enzymes**, leading to reduced production of **prostaglandins** and **thromboxanes**. - It does not significantly inhibit **lipoxygenase (LOX)** enzymes. - Irreversibly acetylates COX-1 and COX-2. *Indomethacin* - **Indomethacin** is a potent **non-selective COX inhibitor**, reducing the synthesis of **prostaglandins**. - Similar to aspirin, it does not exert significant inhibitory effects on the **lipoxygenase** pathway. - One of the most potent NSAIDs available. *Zileuton* - **Zileuton** is a selective **5-lipoxygenase (5-LOX) inhibitor** used in the management of **asthma**. - It reduces the synthesis of **leukotrienes** (LTC4, LTD4, LTE4) which are mediators of bronchoconstriction and inflammation. - It does **not** inhibit cyclooxygenase enzymes, making it distinct from NSAIDs.

Q: Which of the following anti-gout drugs acts by inhibiting the enzyme xanthine oxidase?

Allopurinol. ***Allopurinol*** - **Allopurinol** is a purine analog that **inhibits xanthine oxidase**, thereby preventing the conversion of hypoxanthine and xanthine to uric acid. - Allopurinol is metabolized to **oxypurinol (alloxanthine)**, which acts as a **competitive inhibitor** of xanthine oxidase. - This action leads to a reduction in **serum uric acid levels**, which is crucial for preventing and treating gout attacks. *Probenecid* - **Probenecid** is a **uricosuric agent** that acts by inhibiting the reabsorption of uric acid in the renal tubules, leading to increased excretion of uric acid in the urine. - It does not affect the production of uric acid by inhibiting xanthine oxidase. *Rasburicase* - **Rasburicase** is a recombinant **uricase enzyme** that catalyzes the oxidation of uric acid to **allantoin**, a more water-soluble compound that is easily excreted by the kidneys. - It is primarily used for the management of **tumor lysis syndrome** and severe hyperuricemia, not by inhibiting xanthine oxidase. *Sulfinpyrazone* - **Sulfinpyrazone** is another **uricosuric agent** similar to probenecid, working by inhibiting the renal tubular reabsorption of uric acid. - Its mechanism of action is distinct from xanthine oxidase inhibition and focuses on enhancing uric acid excretion rather than reducing its production.

Q: Which of the following substances is not classified as an opioid?

Ketamine. ***Ketamine*** - **Ketamine** is classified as a **dissociative anesthetic** and does not act on opioid receptors. - Its primary mechanism of action involves **N-methyl-D-aspartate (NMDA) receptor antagonism**. *Heroin* - **Heroin** (diacetylmorphine) is a **semisynthetic opioid** derived from morphine [1, 3]. - It rapidly crosses the **blood-brain barrier** and is metabolized to morphine, where it acts as a potent **mu-opioid receptor agonist** [3]. *Methadone* - **Methadone** is a **synthetic opioid** used in the treatment of opioid dependence and chronic pain [1, 2]. - It acts primarily as a **mu-opioid receptor agonist** with a long duration of action [1, 2]. *Fentanyl* - **Fentanyl** is a powerful **synthetic opioid** analgesic, much more potent than morphine [2]. - It selectively binds to and activates **mu-opioid receptors**, producing strong analgesic and sedative effects [2].

Q: A patient with hemophilia and rheumatoid arthritis may be prescribed which drug to relieve pain?

Acetaminophen. ***Acetaminophen*** - **Acetaminophen** is a preferred pain reliever for patients with hemophilia because it has **no antiplatelet effect** and thus does not increase the risk of bleeding. - It effectively manages mild to moderate pain associated with **rheumatoid arthritis** without impacting coagulation. *Acetylsalicylic acid* - **Acetylsalicylic acid** (aspirin) is an **NSAID** and a potent **antiplatelet agent**, which would significantly increase the risk of bleeding in a patient with hemophilia. - Its use is contraindicated in hemophilia due to the high risk of **hemorrhage**. *Phenylbutazone* - **Phenylbutazone** is an **NSAID** that is rarely used due to severe side effects such as **aplastic anemia** and **agranulocytosis**. - Like other NSAIDs, it inhibits platelet aggregation, posing a significant **bleeding risk** for hemophiliac patients. *Naproxen* - **Naproxen** is another **NSAID** that inhibits cyclooxygenase enzymes, which not only provides pain relief but also **impairs platelet function**. - Its use is contraindicated in hemophilia because it increases the risk of **gastrointestinal and other bleeding episodes**.

Q: Which of the following opioids can be given intranasally?

Butorphanol. ***Butorphanol*** - **Butorphanol** is a synthetic opioid agonist-antagonist that is commonly available as an **intranasal spray** (Stadols NS) for the treatment of moderate to severe pain, especially for conditions like **migraines** [2]. - Its **high lipid solubility** and **good absorption across nasal mucosa** make it suitable for this route of administration, providing rapid onset of action. - This is the **most well-established and widely used intranasal opioid formulation** in clinical practice. *Tramadol* - **Tramadol** is an opioid analgesic with a primary route of administration that is **oral** or **intravenous**. - It is not typically formulated or administered via the **intranasal route** due to lower bioavailability and potential for local irritation. *Pethidine* - **Pethidine** (meperidine) is an opioid typically given via **intramuscular**, **subcutaneous**, or **intravenous** injection [1]. - It is not formulated for **intranasal use**, and this route would not be an effective or safe delivery method for the drug due to poor absorption and potential for mucosal damage. *Buprenorphine* - **Buprenorphine** is a partial opioid agonist available in various formulations, including **sublingual**, **injectable**, and **transdermal** routes, particularly for opioid dependence treatment and pain management [3]. - While intranasal buprenorphine formulations exist, **sublingual remains the preferred and most commonly used route** in clinical practice due to excellent bioavailability and ease of administration [3]. - **Butorphanol** is the classic intranasal opioid emphasized in medical education.

Question 1

Which drug is commonly used for outpatient department (OPD) analgesia?

Accepted Answer

Paracetamol

Answer

Diclofenac

Answer

Ibuprofen

Answer

Tramadol

Question 2

What is the mode of action of azathioprine?

Accepted Answer

T-cell blockade

Answer

↑ IL-2

Answer

Decreased lymphophagocytic activity

Answer

Wide-spread antitumor activity

Question 3

Which enzyme is irreversibly inhibited by aspirin?

Accepted Answer

Cyclooxygenase

Answer

Lipooxygenase

Answer

Thromboxane synthase

Answer

Phospholipase

Question 4

What is the classification of Buprenorphine in terms of its action on opioid receptors?

Accepted Answer

Partial agonist

Answer

Pure agonist

Answer

Pure antagonist

Answer

Mixed agonist-antagonist

Question 5

Which of the following nonsteroidal anti-inflammatory drugs (NSAIDs) has good tissue penetrability with a concentration in synovial fluid?

Accepted Answer

Diclofenac sodium

Answer

Ketorolac

Answer

Piroxicam

Answer

Sulindac

Question 6

Which drug is known to inhibit both cyclooxygenase and lipoxygenase enzymes?

Accepted Answer

BW755

Answer

Aspirin

Answer

Indomethacin

Answer

Zileuton

Question 7

Which of the following anti-gout drugs acts by inhibiting the enzyme xanthine oxidase?

Accepted Answer

Allopurinol

Answer

Rasburicase

Answer

Probenecid

Answer

Sulfinpyrazone

Question 8

Which of the following substances is not classified as an opioid?

Accepted Answer

Ketamine

Answer

Heroin

Answer

Methadone

Answer

Fentanyl

Question 9

A patient with hemophilia and rheumatoid arthritis may be prescribed which drug to relieve pain?

Accepted Answer

Acetaminophen

Answer

Acetylsalicylic acid

Answer

Phenylbutazone

Answer

Naproxen

Question 10

Which of the following opioids can be given intranasally?

Accepted Answer

Butorphanol

Answer

Tramadol

Answer

Pethidine

Answer

Buprenorphine

Analgesics and Anti-inflammatory Drugs — MCQs

Analgesics and Anti-inflammatory Drugs — MCQs

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