The nurse teaches a client who is starting once-daily mirtazapine. Which statement by the client indicates correct understanding?
1I will take it in the evening as prescribed and monitor for drowsiness, increased appetite, and weight gain.✓ Correct answer
2I will use it only on nights when I cannot sleep and skip it whenever my mood improves.
3I will take an extra morning dose if the evening dose does not increase my appetite.
4I will drive immediately after the first dose to determine whether it affects my alertness.
Explanation
Mirtazapine is commonly dosed once daily in the evening because somnolence is frequent. Increased appetite and weight gain are also recognized adverse effects, so the client should monitor them and use caution with activities requiring alertness until the response is known. Mirtazapine is not an as-needed sleep medication, and the client should not skip, add, or stop doses independently.
Clinical reasoning Mirtazapine blocks histamine H1 receptors and is associated with somnolence, increased appetite, and weight gain. Evening administration reduces daytime impairment for many clients.
Decision rule Take the scheduled dose as prescribed, monitor sedation and weight, and avoid driving until the medication's effect on alertness is known.
Scenario 74-year-old female with major depression, weight loss, and chronic insomnia. Provider prescribed mirtazapine 7.5 mg PO HS, chosen for its sedation and appetite stimulation at low dose.
Mirtazapine — A tetracyclic antidepressant whose common adverse effects include somnolence, increased appetite, weight gain, and dizziness.
Histamine H1 blockade — A receptor-blocking effect that contributes to mirtazapine-associated sedation and increased appetite.
Geriatric depression — Depression in adults ≥65 — often presents with somatic complaints, weight loss, insomnia, and cognitive slowing rather than overt sadness.