Eur J Clin Pharmacol. 1978 May 17;13(2):153-5.

Effect of capsule colour and order of administration of hypnotic treatments.

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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[Effects of 2 hypnotics (Nitrazepam and Dormin) on self-rated and physiologically recorded sleep in subjects with and without anxiety symptoms]. [Nord Med. 1970]
[Effects of 2 hypnotics (Nitrazepam and Dormin) on self-rated and physiologically recorded sleep in subjects with and without anxiety symptoms].
Bohlin G, Wikmark G, Dureman I. Nord Med. 1970 Jan 29; 83(5):137-42.
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[Clinical testing of a hypnotic consisting of a combination of methaqualone and diphenhydramine against methaqualone alone in double blind test].
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Cited by 1 PubMed Central article

Effect of colour of drugs: systematic review of perceived effect of drugs and of their effectiveness. [BMJ. 1996]
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de Craen AJ, Roos PJ, Leonard de Vries A, Kleijnen J. BMJ. 1996 Dec 21-28; 313(7072):1624-6.

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Effect of capsule colour and order of administration of hypnotic treatments.

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