An extract from the wood of an oriental tree. It is astringent, and is very useful in diarrhoea. Tincture of catechu is the best preparation. Dose, half a teaspoonful to a teaspoonful, in water. An excellent medicine to check troublesome diarrhoea consists of equal parts of tincture of catechu and paregoric; of this mixture, the dose is a teaspoonful, repeated according to the urgency of the case.