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[mass noun] A compound which is the active ingredient of the Calabar bean and is used medicinally in eye drops on account of its anticholinesterase activity.
- ‘But since physostigmine could be isolated only from the Calabar bean, the drug was not readily available.’
- ‘Compared with placebo, an infusion of physostigmine produced a 21% decrease in apnea-hypopnea index and a 23% increase in the minimum level of oxygen saturation.’
- ‘Julian was interested in medicinal plants, particularly the Calabar bean whose active principle, physostigmine, was first isolated by the German chemists Jobst and Hesse in 1864.’
- ‘Some authorities have recommended against the use of physostigmine because of its frequent association with increased bronchial secretions and its rare association with asystole.’
- ‘The symptoms of anticholinergic overdose may be treated with physostigmine in a dosage of 1 to 2 mg given intramuscularly or intravenously at 20-minute intervals.’
Mid 19th century: from the modern Latin genus name Physostigma (to which the Calabar bean belongs) + -ine.
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