"I gave her a mild dose of trional. A perfectly harmless preparation."
Agatha Christie. And Then There Were None. p.94 (1939)
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“It is easy to see,” Cottard went on, “that you have never administered, as I have, as much as two grains of trional without succeeding in provoking som-nolescence.” “Quite so, quite so,” replied the Marquis, laughing with a superior air, “I have never taken trional, or any of those drugs which soon cease to have any effect but ruin your stomach. When a man has been out shooting all night, like me, in the forest of Chantepie, I can assure you he doesn’t need any trional to make him sleep.”