Barbiturate

A barbiturate is a drug that acts as a central nervous system depressant, and can therefore produce a wide range of effects, from mild sedation to death.

Types of barbiturates

 * Barbital, marketed under the brand names Veronal and Medinal.

Characters poisoned with barbiturates

 * Carlotta Adams - Lord Edgware Dies
 * Mrs Chapman - Hickory Dickory Dock
 * Mrs Etherington - Curtain
 * Mrs Ferrars - The Murder of Roger Ackroyd (suicide)
 * Arthur Hastings? - Curtain (not fatally)
 * Stephen Norton? - Curtain (not fatally)
 * Mabelle Sainsbury Seale - One, Two, Buckle My Shoe
 * James Sheppard - The Murder of Roger Ackroyd (suicide)