Which of the following is an example of a tertiary tricyclic antidepressant commonly avoided in older adults?

Which of the following is an example of a tertiary tricyclic antidepressant commonly avoided in older adults?

• A. Desipramine
• B. Nortriptyline
• C. Imipramine
• D. Amitriptyline

Answer: (D)

Tertiary tricyclic antidepressants have a higher anticholinergic burden and more sedative effects, which older adults are especially sensitive to. Amitriptyline is a classic example of a tertiary amine TCA with strong anticholinergic activity and pronounced sedation, making it more likely to cause delirium, confusion, constipation, urinary retention, and falls in the elderly. For this reason it is commonly avoided in older patients. Desipramine and nortriptyline are secondary amine TCAs and tend to have less anticholinergic impact, so they are considered somewhat safer options if a TCA must be used. Imipramine is also a tertiary TCA, but amitriptyline is the one most notably avoided due to the heavier anticholinergic profile.

Tertiary tricyclic antidepressants have a higher anticholinergic burden and more sedative effects, which older adults are especially sensitive to. Amitriptyline is a classic example of a tertiary amine TCA with strong anticholinergic activity and pronounced sedation, making it more likely to cause delirium, confusion, constipation, urinary retention, and falls in the elderly. For this reason it is commonly avoided in older patients.

Desipramine and nortriptyline are secondary amine TCAs and tend to have less anticholinergic impact, so they are considered somewhat safer options if a TCA must be used. Imipramine is also a tertiary TCA, but amitriptyline is the one most notably avoided due to the heavier anticholinergic profile.