The effect of a first-generation H sub(1)-antihistamine on postural control: a preliminary study in healthy volunteers

• Published in: Experimental brain research Vol. 231; no. 3; pp. 257 - 266
• Main Authors: Chihara, Yasuhiro, Sato, Ayako, Ohtani, Michiteru, Fujimoto, Chisato, Hayashi, Takahiro, Nishijima, Hironobu, Yagi, Masato, Iwasaki, Shinichi
• Format: Journal Article
• Language: English
• Published: 01-11-2013
• ISSN: 0014-4819; 1432-1106
• DOI: 10.1007/s00221-013-3675-1

First-generation H sub(1)-antihistamines are known to cause fatigue and drowsiness, due to their poor receptor selectivity and their high penetration rate of the blood-brain barrier. However, little is known about the effects of first-generation H sub(1)-antihistamines on postural stability. The purpose of this study was to evaluate the effects of d-chlorpheniramine on postural stability using posturography with and without foam rubber. A double-blind study with three parallel groups was conducted. Twenty-seven healthy young volunteers (mean age 21.9 years) were recruited and orally administered d-chlorpheniramine, 2 or 4 mg, or placebo. Postural sway was measured every hour up to 8 h after administration. Two-legged stance tasks were performed by each subject in four conditions: eyes open or eyes closed and with or without foam rubber. Inter-group comparisons showed that the group receiving 4-mg d-chlorpheniramine showed significantly larger sway in the eyes open with foam rubber condition (visual and vestibular information available, somatosensory information reduced). Inter-subject analysis in the 4-mg d-chlorpheniramine group showed that the effect of d-chlorpheniramine on postural control was variable. Our results suggest that among the three main sensory systems responsible for postural control (visual, vestibular, and somatosensory), d-chlorpheniramine may have a larger effect on the visual and/or vestibular systems in susceptible individuals.