The pharmacopeial dose of the acid is 5-20 grains, but it is so unrelated to experience and practice that it may be ignored.
There are numerous preparations, patent and pharmacopeial, their composition being extremely varied, so that, unless one has reason to be certain of any particular preparation, it is almost better to use only the dried leaves themselves in the form of a powder (dose a-z grains).
The pharmacopeial tincture may be given in doses of five to fifteen minims, and the infusion has the unusually small dose of two to four drachms - the dose of other infusions being an ounce or more.
There are four pharmacopeial preparations.
The pharmacopeial pilule quininae contains 5 parts of the sulphate in 6.