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Adding night-time hydroxyzine to levocetirizine increases daytime somnolence without improving urticaria control, sleep disturbance, or quality of life compared with levocetirizine alone.
Combining a second-generation, nonsedating H1-antihistamine in the morning with a sedating first-generation agent—most commonly hydroxyzine—at night is a widespread clinical habit aimed at mitigating nocturnal itch and improving sleep in patients with chronic spontaneous urticaria (CSU). However, findings from a randomized, double-blind, cross-over trial indicate that this approach yields no clinical advantage over second-generation antihistamine monotherapy and instead substantially exacerbates daytime drowsiness.
The trial examined 24 patients diagnosed with difficult-to-treat CSU across two 5-day intervention periods. Researchers compared two treatment regimens:
At the conclusion of each treatment block, key outcomes were evaluated via validated instruments, including the Chronic Urticaria Quality of Life Questionnaire (CU-Q2oL), the Urticaria Activity Score (UAS), and assessments measuring nocturnal sleep disturbance alongside daytime somnolence.
Both therapeutic strategies yielded robust and comparable clinical efficacy, demonstrating remarkable reductions from baseline in UAS values, night-time sleep disruption, and overall CU-Q2oL impairment scores. Crucially, no pivotal differences in symptom relief or sleep restoration were noted between the two regimens.
Differential impact on daytime drowsiness
While efficacy metrics were aligned, the regimens diverged sharply regarding safety and tolerability profiles:
Clinical practice implications
These findings challenge the long-standing clinical belief that sedating first-generation antihistamines at bedtime enhance sleep architecture or overall disease control. The results reinforce current management guidelines, which advocate exclusively for non-sedating, second-generation H1-antihistamines as the primary approach for CSU before considering advanced therapies.
The British Journal of Dermatology
Night-time sedating H1-antihistamine increases daytime somnolence but not treatment efficacy in chronic spontaneous urticaria: a randomized controlled trial
M Staevska et al.
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