Analgesics and Anti-inflammatory Drugs Practice Questions

Q: A patient presented with pain in the right lower quadrant of abdomen. He has history of renal stones in right kidney. He was prescribed an opioid which is agonist at kappa receptors and antagonist at mu receptors. The likely drug given was:

Pentazocine. ***Pentazocine*** - **Pentazocine** is a **mixed agonist-antagonist opioid analgesic** that acts as an **agonist at kappa opioid receptors** and a **weak antagonist or partial agonist at mu opioid receptors**. - This unique receptor profile makes it the drug described in the question. - It is effective for **moderate to severe pain** including **renal colic** (pain from renal stones), while having a **lower abuse potential** and **ceiling effect on respiratory depression** compared to pure mu agonists. *Tramadol* - **Tramadol** is a synthetic opioid that acts primarily as a **weak mu-opioid receptor agonist** and also inhibits the reuptake of **norepinephrine** and **serotonin**. - It does **not** have significant kappa receptor agonism or mu receptor antagonism. - Does not fit the description given in the question. *Buprenorphine* - **Buprenorphine** is a **partial agonist at mu opioid receptors** and an **antagonist at kappa opioid receptors**. - This receptor activity profile is the **opposite** of what is described in the question (which asks for kappa agonist, mu antagonist). *Fentanyl* - **Fentanyl** is a highly potent **pure mu-opioid receptor agonist**. - It has **no significant kappa receptor agonism** or mu receptor antagonism. - Does not match the pharmacological profile described in the question.

Q: Pegloticase is used in:

Chronic gout. ***Chronic gout*** - Pegloticase is an enzyme that converts **uric acid to allantoin**, a more water-soluble compound readily excreted by the kidneys. - It is specifically approved for the treatment of **chronic, refractory gout** in patients who have failed to achieve target serum uric acid levels with conventional therapies. *Rheumatoid arthritis* - This condition is an **autoimmune inflammatory disease** primarily affecting the joints. - Treatment typically involves **DMARDs** (disease-modifying antirheumatic drugs) such as methotrexate, biologics, and corticosteroids, not pegloticase. *Paralytic ileus* - This is a condition characterized by the **absence of bowel motility**, often due to surgery, medications, or electrolyte imbalances. - Management focuses on supportive care, addressing the underlying cause, and sometimes prokinetic agents, but not pegloticase. *Psoriatic arthritis* - This is a specific type of **inflammatory arthritis** associated with psoriasis. - Treatment regimens for psoriatic arthritis usually involve DMARDs, biologics (like TNF inhibitors), and NSAIDs, rather than pegloticase.

Q: A 55-year-old patient with gout has high uric acid levels; which drug should be avoided?

Aspirin. ***Aspirin*** - High doses of **aspirin** can increase serum uric acid levels, which is detrimental for a patient with gout desiring to lower uric acid. - While low-dose aspirin (<300 mg/day) might have a minor uricosuric effect, higher doses are **anti-uricosuric** and should generally be avoided in gout. *Probenecid* - **Probenecid** is a **uricosuric agent** that helps excrete uric acid via the kidneys, making it beneficial for patients who underexcrete uric acid. - It works by inhibiting the reabsorption of uric acid in the renal tubules, thereby lowering serum uric acid levels. *Allopurinol* - **Allopurinol** is a **xanthine oxidase inhibitor** that reduces the production of uric acid by blocking the enzyme responsible for its synthesis. - It is a cornerstone treatment for chronic gout to lower uric acid levels and prevent recurrent attacks. *Febuxostat* - **Febuxostat** is also a **xanthine oxidase inhibitor**, similar to allopurinol, used to reduce uric acid production. - It is often considered an alternative for patients who cannot tolerate allopurinol or who do not achieve target uric acid levels with allopurinol.

Q: Mechanism of action of aspirin in pain relief is:

Inhibits COX enzymes. **Inhibits COX enzymes** - **Aspirin** exerts its analgesic effects primarily by **irreversibly inhibiting** cyclooxygenase (COX) enzymes, particularly COX-1 and COX-2. - This inhibition reduces the synthesis of **prostaglandins**, which are important mediators of pain and inflammation. *Enhances opioid action* - Opioids primarily act on **opioid receptors** in the central nervous system to reduce pain perception. - Aspirin does not directly enhance opioid action; while they can be used together for additive pain relief, their mechanisms are distinct. *Activates serotonin receptors* - Activation of **serotonin receptors** (5-HT receptors) can play a role in pain modulation, but aspirin's primary mechanism is not through these receptors. - Some antidepressants and triptans exert their effects via serotonin receptors. *Blocks NMDA receptors* - **NMDA receptors** are involved in neuronal excitability and the processing of pain signals, particularly in chronic pain. - Drugs that block NMDA receptors, such as ketamine, have analgesic properties but this is not the mechanism of action for aspirin.

Q: Which of the following pain medications requires the MOST caution in a patient with a history of opioid addiction?

Morphine. ***Morphine*** - Morphine is a **full mu-opioid agonist** with the highest potential for **abuse, dependence, and relapse** in patients with a history of opioid addiction due to its strong **euphoric effects**. - It carries the greatest risk of triggering **addictive behaviors** and relapse in recovering patients, making it require the MOST caution in this population. - Use should be avoided if possible, or limited to short-term use under strict supervision with alternative analgesics preferred. *Oxycodone* - Oxycodone is another **potent full opioid agonist** with very high abuse potential, nearly equivalent to morphine. - While requiring extreme caution, morphine remains the prototypical high-risk opioid in addiction-prone patients. *Methadone* - Methadone is a **long-acting full opioid agonist** used in opioid maintenance therapy with significant abuse potential. - However, when used appropriately in supervised programs, it has a role in addiction treatment, though acute pain prescribing requires caution due to its **long half-life and QTc prolongation risk**. *Buprenorphine* - Buprenorphine is a **partial mu-opioid agonist** with a **ceiling effect** that limits respiratory depression and euphoria. - It is the **standard medication for opioid use disorder treatment** and has LOWER abuse potential than full agonists. - While it requires careful timing to avoid precipitated withdrawal in opioid-dependent patients, it is actually SAFER than full agonists in patients with addiction history due to reduced relapse risk.

Q: Which of the following is an absolute contraindication to the use of nonsteroidal anti-inflammatory drugs (NSAIDs)?

Active peptic ulcer disease. ***Active peptic ulcer disease*** - NSAIDs **inhibit cyclooxygenase (COX)** enzymes, which are responsible for producing **prostaglandins** that protect the gastric mucosa. - In patients with **active peptic ulcers**, this inhibition can lead to serious complications like **bleeding** or **perforation**, making it an **absolute contraindication**. - A history of peptic ulcer disease is a relative contraindication, but active disease is an absolute contraindication. *Asthma* - While NSAIDs can exacerbate asthma in susceptible individuals (**NSAID-exacerbated respiratory disease or aspirin-exacerbated respiratory disease**), it is usually a **relative contraindication** rather than an absolute one. - This reaction typically affects a specific subset of asthmatic patients (around 10-20%) with aspirin sensitivity and nasal polyps. *Rheumatoid arthritis* - NSAIDs are commonly used to **manage pain and inflammation** associated with rheumatoid arthritis. - It is a condition where NSAIDs are **indicated** for symptom relief, not a contraindication. *Hypertension* - NSAIDs can contribute to **elevated blood pressure** due to their effects on renal prostaglandin synthesis, leading to sodium and water retention. - Although NSAIDs should be used cautiously in hypertensive patients, it is considered a **relative contraindication**, requiring close monitoring rather than an absolute prohibition.

Q: How do antipyretic medications help in reducing fever?

They inhibit prostaglandin synthesis. ***They inhibit prostaglandin synthesis.*** - Fever is mediated by **prostaglandins**, specifically **PGE2**, which are released in response to pyrogens and act on the **hypothalamus** to raise the body's set point. - Antipyretics like **NSAIDs** (e.g., ibuprofen, aspirin) and **acetaminophen** (paracetamol) primarily work by inhibiting the enzyme **cyclooxygenase (COX)**, thereby reducing the production of these fever-inducing prostaglandins. *They reduce sweating* - Reducing sweating would impair the body's natural cooling mechanism and **exacerbate fever**, not reduce it. - Sweating is a **thermoregulatory response** to actively cool the body when its temperature set point is lowered. *They constrict blood vessels* - **Vasoconstriction** reduces heat loss from the skin and is a process the body uses **to conserve heat** or **raise body temperature**, which would worsen fever. - Antipyretics promote **vasodilation** as part of the body's heat loss mechanisms once the hypothalamic set point is reset. *They directly cool the body* - Antipyretics act **pharmacologically** to modulate internal physiological processes, not by physically or directly cooling the body. - Direct cooling methods like cold compresses or sponging are **external interventions**, distinct from the action of antipyretic medications.

Q: A patient with an autoimmune disease is prescribed an anti-inflammatory drug that inhibits phospholipase A2. Which drug is appropriate?

Prednisone. ***Prednisone*** - **Corticosteroids** like prednisone mimic natural glucocorticoids and are potent **anti-inflammatory** agents. - They inhibit **phospholipase A2**, thereby preventing the release of **arachidonic acid** from cell membranes, which is the precursor for prostaglandins and leukotrienes. *Methotrexate* - This is a **disease-modifying antirheumatic drug (DMARD)** primarily used as an **immunosuppressant** in autoimmune diseases. - Its mechanism involves inhibiting **dihydrofolate reductase**, which interferes with DNA synthesis, but it does not directly inhibit **phospholipase A2**. *Aspirin* - **Aspirin** is a **non-steroidal anti-inflammatory drug (NSAID)** that works by irreversibly inhibiting **cyclooxygenase (COX) enzymes 1 and 2**. - It does not inhibit **phospholipase A2**, but rather acts downstream in the arachidonic acid pathway. *Celecoxib* - **Celecoxib** is a **selective COX-2 inhibitor**, belonging to the NSAID class. - It specifically targets **COX-2** to reduce inflammation with fewer gastrointestinal side effects compared to non-selective NSAIDs, but it does not inhibit **phospholipase A2**.

Q: A patient with an autoimmune disease receives a biological agent that inhibits TNF-alpha. Identify the drug:

Infliximab. ***Infliximab*** - **Infliximab** is a **chimeric monoclonal antibody** that functions as a tumor necrosis factor-alpha (TNF-alpha) inhibitor, directly binding to and neutralizing TNF-alpha. - It is effectively used in treating several autoimmune conditions like **rheumatoid arthritis**, **Crohn's disease**, **psoriatic arthritis**, and **ankylosing spondylitis** by reducing inflammation. *Methotrexate* - **Methotrexate** is a **disease-modifying antirheumatic drug (DMARD)** and an **antimetabolite** that inhibits dihydrofolate reductase. - While used in autoimmune diseases, it primarily acts by **interfering with immune cell proliferation** and inflammation, not by directly inhibiting TNF-alpha. *Mycophenolate mofetil* - **Mycophenolate mofetil** is an **immunosuppressant** that selectively inhibits inosine monophosphate dehydrogenase, crucial for de novo purine synthesis in lymphocytes. - It is mainly used in **organ transplantation** to prevent rejection and in certain autoimmune conditions like lupus nephritis, not as a direct TNF-alpha inhibitor. *Azathioprine* - **Azathioprine** is a **prodrug** that is metabolized to 6-mercaptopurine, which then interferes with DNA synthesis, primarily affecting rapidly dividing cells like lymphocytes. - It is used as an immunosuppressant in **autoimmune diseases** and **transplant rejection**, but it does not directly target TNF-alpha.

Question 1

A patient presented with pain in the right lower quadrant of abdomen. He has history of renal stones in right kidney. He was prescribed an opioid which is agonist at kappa receptors and antagonist at mu receptors. The likely drug given was:

Accepted Answer

Pentazocine

Answer

Tramadol

Answer

Buprenorphine

Answer

Fentanyl

Question 2

Which of the following is a false statement?

Accepted Answer

Gastric irritation is more severe with NSAIDs compared to aspirin

Answer

Acetaminophen does not have anti-inflammatory action

Answer

Non-selective COX inhibitors are contraindicated in postoperative patients

Answer

NSAID with least cardiovascular risk is Naproxen

Question 3

Pegloticase is used in:

Accepted Answer

Chronic gout

Answer

Rheumatoid arthritis

Answer

Paralytic ileus

Answer

Psoriatic arthritis

Question 4

A 55-year-old patient with gout has high uric acid levels; which drug should be avoided?

Accepted Answer

Aspirin

Answer

Probenecid

Answer

Allopurinol

Answer

Febuxostat

Question 5

Mechanism of action of aspirin in pain relief is:

Accepted Answer

Inhibits COX enzymes

Answer

Enhances opioid action

Answer

Activates serotonin receptors

Answer

Blocks NMDA receptors

Question 6

Which of the following pain medications requires the MOST caution in a patient with a history of opioid addiction?

Accepted Answer

Morphine

Answer

Oxycodone

Answer

Methadone

Answer

Buprenorphine

Question 7

Which of the following is an absolute contraindication to the use of nonsteroidal anti-inflammatory drugs (NSAIDs)?

Accepted Answer

Active peptic ulcer disease

Answer

Asthma

Answer

Rheumatoid arthritis

Answer

Hypertension

Question 8

How do antipyretic medications help in reducing fever?

Accepted Answer

They inhibit prostaglandin synthesis

Answer

They reduce sweating

Answer

They constrict blood vessels

Answer

They directly cool the body

Question 9

A patient with an autoimmune disease is prescribed an anti-inflammatory drug that inhibits phospholipase A2. Which drug is appropriate?

Accepted Answer

Prednisone

Answer

Methotrexate

Answer

Aspirin

Answer

Celecoxib

Question 10

A patient with an autoimmune disease receives a biological agent that inhibits TNF-alpha. Identify the drug:

Accepted Answer

Infliximab

Answer

Azathioprine

Answer

Mycophenolate mofetil

Answer

Methotrexate

Analgesics and Anti-inflammatory Drugs — MCQs

Analgesics and Anti-inflammatory Drugs — MCQs

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