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Some clinical pharmacological studies with terfenadine, a new antihistamine drug.

1 A double-blind cross-over trial between placebo, chlorpheniramine, and terfenadine, a new antihistamine drug, was performed in healthy male volunteers to determine and compare their CNS and autonomic effects. 2 Terfenadine and chlorpheniramine were administered orally in therapeutic doses. 3 In objective tests of critical flicker frequency, pursuit rotor, reaction time, salivary volume and pupillary diameter, no statistically significant difference was observed between the treatments. 4 On analogue rating scales, chlorpheniramine produced a statistically significant (P less than 0.05) degree of sedation and impaired concentration as compared to placebo and terfenadine. 5 The results obtained in analogue rating scales were not normally distributed and, therefore, use of non-parametric statistical methods for analysis of such data is strongly advocated.