Which class has a T1/2 range of 16-80 hours?

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Multiple Choice

Which class has a T1/2 range of 16-80 hours?

Understanding how long a drug stays in the body (half-life) helps explain dosing, accumulation, and withdrawal risk. Tricyclic antidepressants have the longest and most variable elimination half-lives among common psychotropic classes because they are lipophilic, have multiple active metabolites, and are processed differently by individuals (CYP2D6 and related enzymes). This leads to a broad range, often cited around 16 to 80 hours, reflecting both drug properties and patient variability. In contrast, many SSRIs/SNRIs tend to have shorter or more predictable half-lives (even though some have notably long ones like fluoxetine, the class as a whole doesn’t typically present that wide broad range). Non-benzodiazepine hypnotics are generally short-acting, with half-lives of a few hours. Benzodiazepines span a wide range, but not as consistently broad as the 16–80-hour window described for tricyclics.

Understanding how long a drug stays in the body (half-life) helps explain dosing, accumulation, and withdrawal risk. Tricyclic antidepressants have the longest and most variable elimination half-lives among common psychotropic classes because they are lipophilic, have multiple active metabolites, and are processed differently by individuals (CYP2D6 and related enzymes). This leads to a broad range, often cited around 16 to 80 hours, reflecting both drug properties and patient variability.

In contrast, many SSRIs/SNRIs tend to have shorter or more predictable half-lives (even though some have notably long ones like fluoxetine, the class as a whole doesn’t typically present that wide broad range). Non-benzodiazepine hypnotics are generally short-acting, with half-lives of a few hours. Benzodiazepines span a wide range, but not as consistently broad as the 16–80-hour window described for tricyclics.

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