Nokea
A non-competitive antagonist :
- A. Alters the mechanism of action of an agonist
- B. Alters the potency of an agonist
- C. Shifts the dose-response curve of an agonist to the right
- D. Decreases the maximum response to an agonist
Correct Answer: D
Rationale: Non-competitive antagonists reduce the maximal response (efficacy), not potency, distinguishing them from competitive antagonists.
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Which of the following is a side effect of propylthiouracil?
- A. Agranulocytosis
- B. Arrhythmias
- C. Diabetes
- D. Hypertension
Correct Answer: A
Rationale: Propylthiouracil can cause agranulocytosis, a severe drop in white blood cells.
Phenylephrine is useful for all of the following except
- A. Anaphylactic shock
- B. Mydriasis
- C. Nasal decongestant
- D. Artial tachycardia
Correct Answer: A
Rationale: Phenylephrine (alpha-agonist) is not used in anaphylactic shock (epinephrine is preferred).
BZDs may be used in following situations EXCEPT:
- A. Anaesthesia
- B. Anxiety
- C. Floppy infant syndrome
- D. Epilepsy
Correct Answer: C
Rationale: Benzodiazepines (BZDs) are used in anesthesia, anxiety, and epilepsy, but floppy infant syndrome is a side effect of maternal BZD use, not a condition treated with them.
Why is diclofenac combined with misoprostol?
- A. They are synergistic
- B. They are additive
- C. To reduce hepatic side effects
- D. To prevent diclofenac-related gastric ulcers
Correct Answer: D
Rationale: Misoprostol protects against diclofenac-induced gastric ulcers.
Chlorpropamide metabolism is enhanced by
- A. Ethyl alcohol
- B. Diazepam
- C. Lorazepam
- D. Chloridazepoxide
Correct Answer: A
Rationale: Ethyl alcohol induces hepatic enzymes, enhancing the metabolism of chlorpropamide, a sulfonylurea antidiabetic drug.