Jalap is a powerful cathartic and hydrogogue, and is therefore apt to
gripe.
_Dose,_ of the _powder,_ from ten to thirty grains, combined with a
drop or two of aromatic oil; of the _compound powder,_ from fifteen to
forty grains; of the _tincture,_ from one to three drachms; of the
_extract,_ from ten to twenty grains. The watery extract is better
than the alcoholic.