Which one of the following non-narcotic agents inhibits mainly cyclooxygenase (COX) in CNS?

Correct Answer: A

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: A

Rationale: The correct answer is A: Meridil. Meridil is a CNS stimulant that is a piperidine derivative. Piperidine is a chemical structure that is present in the drug Meridil, making it the correct choice. Amphetamine (B) is not a piperidine derivative; it belongs to the phenethylamine class. Caffeine (C) is a xanthine derivative. Sydnophen (D) is not a piperidine derivative but a sympathomimetic amine. Therefore, based on the chemical structure and classification, Meridil is the only option that fits the criteria of being a piperidine derivative.

Correct Answer: B

Rationale: Step 1: Flumazenil is a benzodiazepine receptor antagonist used to reverse benzodiazepine overdose. Step 2: Given intravenously, it acts rapidly to competitively inhibit the effects of benzodiazepines. Step 3: Flumazenil has a short half-life of about 1 hour, resulting in a rapid onset but short duration of action. Step 4: Therefore, choice B is correct as it accurately describes the pharmacokinetics of flumazenil. Summary: Choices A, C, and D are incorrect because flumazenil does not have an intermediate onset and duration of action of about 2 hours, an effect lasting 3-5 hours, or a duration of action longer than 6 hours.

Correct Answer: D

Rationale: The correct answer is D: All of the above. Thiopental, etomidate, and propofol are commonly used intravenous agents for induction of anesthesia. They provide a faster onset and rate of recovery compared to inhaled anesthetics. Additionally, these agents do not provide conscious sedation but rather induce a state of unconsciousness for surgical procedures. Therefore, the correct answer is D as it encompasses all the unique characteristics of intravenous anesthetics compared to inhaled anesthetics.

Correct Answer: B

Rationale: Rationale: 1. Ethyl alcohol is a substance known to stimulate appetite, not decrease it. 2. Alcohol consumption often leads to increased hunger and overeating. 3. Therefore, the correct answer is B: FALSE. Summary: A: Incorrect - Ethyl alcohol does not decrease appetite. C: Incorrect - Ethyl alcohol does not decrease appetite for all individuals. D: Incorrect - Ethyl alcohol does have an impact on appetite.