Safe Combination of Trazodone and Hydroxyzine

Introduction to Combination Therapy

The American Academy of Sleep Medicine acknowledges that combinations of medications from different classes targeting sleep-wake mechanisms can be used together safely and effectively, as seen with trazodone and hydroxyzine 1

Trazodone is an antidepressant with anxiolytic and sedative/hypnotic effects that works primarily through antagonism of alpha2-adrenergic receptors and 5-HT2/1C receptors, while hydroxyzine (Atarax) is an antihistamine with sedative properties commonly used for anxiety and as a sleep aid 2
Both medications have CNS depressant effects and are often prescribed for sleep difficulties, with the American Academy of Sleep Medicine providing guidelines for their use 1, 3

No specific contraindications exist for the combination of trazodone and hydroxyzine in current guidelines from the American Academy of Sleep Medicine 3, 2
The combination may provide complementary effects for patients with insomnia, as they work through different mechanisms, according to the American Academy of Sleep Medicine 1

Both medications have sedative properties, so the combined sedative effect may be additive, requiring dosage adjustments to avoid excessive sedation 2, 3
Patients should be advised about potential increased drowsiness and cautioned about activities requiring alertness, especially when starting this combination, as recommended by the American Academy of Sleep Medicine 1, 2

Start with lower doses of each medication when using them in combination, and take medications as prescribed, typically at bedtime for both agents, to minimize adverse effects 3, 2
Avoid combining with other CNS depressants including alcohol, which could dangerously increase sedation, as warned by the American Academy of Sleep Medicine 1, 2

Elderly patients may require lower doses of both medications due to increased sensitivity to sedative effects, and patients with respiratory conditions should use this combination with caution, according to the American Academy of Sleep Medicine 2
Patients with hepatic impairment may require dosage adjustments, as recommended by the American Academy of Sleep Medicine 3

Monitor for excessive daytime sedation, especially during the initial period of combined use, and assess efficacy for sleep improvement and any potential adverse effects at follow-up appointments, as suggested by the American Academy of Sleep Medicine 1, 3

The combination of trazodone and hydroxyzine is preferable to benzodiazepines, which carry risks of dependency, diversion, falls, and cognitive impairment, according to the 2019 VA/DoD guidelines 4
Antihistamines alone, like hydroxyzine monotherapy, develop tolerance to sedative effects after 3-4 days of continuous use, limiting their benefit for sustained treatment, making the combination with trazodone more rational for ongoing management 4

The American College of Physicians, as reported in the Annals of Internal Medicine, suggests that this combination is preferable due to the risks associated with benzodiazepines 4