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Clinical Trial
. 1978 May 17;13(2):153-5.
doi: 10.1007/BF00609760.

Effect of capsule colour and order of administration of hypnotic treatments

P E Lucchelli, A D Cattaneo, J Zattoni
Clinical Trial

Effect of capsule colour and order of administration of hypnotic treatments

P E Lucchelli et al. Eur J Clin Pharmacol. .

Abstract

Ninety-six hospitalized insomniac patients were asked to compare by a daily questionnaire the effect on sleep of the colour of the capsules and the order of administration of two treatments--heptabarbital and placebo. A balanced incomplete-block design was used; sleep onset time and sleep duration time were the main criteria of assessment. There was a significant interaction of colour and order of administration with sex. The placebo response was positive in 36% of instances.

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