Which compound has the longest half-life among Acetylcholine, Carbachol, and Methacholine?

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Prepare for the Drug Action 2 Exam. Focus on multiple-choice questions, learn through interactive quizzes, and understand core drug mechanisms with explanations. Dive deep into pharmacokinetics and pharmacodynamics to ace your test!

Multiple Choice

Which compound has the longest half-life among Acetylcholine, Carbachol, and Methacholine?

Explanation:
The main idea is how chemical stability against cholinesterases determines how long a drug lasts. Acetylcholine is rapidly broken down by acetylcholinesterase, so its half-life is very short. Methacholine is designed to be more resistant than acetylcholine, giving a longer action, but it’s still susceptible to hydrolysis. Carbachol has a carbamate-type linkage that makes it much less prone to acetylcholinesterase breakdown, so it remains active longer. Because of this reduced enzymatic degradation, carbachol tends to have the longest half-life among these three.

The main idea is how chemical stability against cholinesterases determines how long a drug lasts. Acetylcholine is rapidly broken down by acetylcholinesterase, so its half-life is very short. Methacholine is designed to be more resistant than acetylcholine, giving a longer action, but it’s still susceptible to hydrolysis. Carbachol has a carbamate-type linkage that makes it much less prone to acetylcholinesterase breakdown, so it remains active longer. Because of this reduced enzymatic degradation, carbachol tends to have the longest half-life among these three.

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