Indicate a partial mu receptor agonist which has 20-60 times analgesic potency of morphine and a longer duration of action:

Correct Answer: B

Rationale: Step 1: Buprenorphine is a partial mu receptor agonist with 20-60 times the analgesic potency of morphine. This is due to its high affinity for the mu receptor, resulting in potent analgesic effects. Step 2: Buprenorphine also has a longer duration of action compared to morphine, making it suitable for sustained pain management. Summary: A: Pentazocine is a mixed opioid receptor agonist/antagonist, not a partial mu receptor agonist like buprenorphine. C: Nalbuphine is a kappa receptor agonist and mu receptor antagonist, not a partial mu receptor agonist like buprenorphine. D: Naltrexone is a pure opioid receptor antagonist, not a partial mu receptor agonist like buprenorphine.

Correct Answer: B

Rationale: The correct answer is B: Fluoxetine. Fluoxetine is a Selective Serotonin Reuptake Inhibitor (SSRI) with minimal autonomic toxicity compared to tricyclic antidepressants like Amitriptyline (A), Imipramine (C), and Doxepin (D). SSRIs have a more favorable side effect profile with reduced risk of anticholinergic effects, orthostatic hypotension, and cardiac toxicity. Fluoxetine specifically has a lower affinity for muscarinic, histaminic, and alpha-adrenergic receptors, reducing autonomic side effects. Amitriptyline, Imipramine, and Doxepin are tricyclic antidepressants that have stronger anticholinergic and sedative effects, leading to more autonomic toxicity.

Correct Answer: A

Rationale: Anxiolytics are medications used to treat anxiety disorders, which fall under the category of neurosis. Neurosis is characterized by excessive worry, fear, and distress. Anxiolytics help alleviate symptoms such as restlessness and tension associated with anxiety. Psychosis (choice B) involves loss of touch with reality, narcolepsy (choice C) is a sleep disorder, and bipolar disorders (choice D) involve mood swings between mania and depression. Anxiolytics are not typically indicated for these conditions.

Correct Answer: B

Rationale: The correct answer is B: LSD. Hallucinogens are a class of drugs that alter perception, thoughts, and feelings. LSD, also known as acid, is a well-known hallucinogen that causes visual and auditory hallucinations. Heroin (A) is an opioid, Cocaine (C) is a stimulant, and Opium (D) is an opioid, none of which belong to the hallucinogen category. Therefore, B is the correct answer as it is the only drug related to hallucinogens among the choices provided.

Correct Answer: B

Rationale: The correct answer is B: Ephedrine. Ephedrine is a sympathomimetic drug that acts by stimulating alpha and beta-adrenergic receptors, leading to bronchodilation. Isoprenaline (A) is a non-selective beta-adrenergic agonist. Atropine (C) is an anticholinergic drug that inhibits parasympathetic activity. Salbutamol (D) is a selective beta2-adrenergic agonist commonly used as a bronchodilator. Therefore, the correct choice for a bronchodilator drug belonging to sympathomimetics is Ephedrine.