Measure word for 中药 and 西药
a single package of a prescription of Chinese Medicine is called 一服（FU）， because you would normally boil the whole package in a pot and drink the produced liquid at once. so one of 服's meaning is taking medicine for both western and chinese medicines.  The units of each ingredient in the prescription normally are tael(两) and mace(钱）。

For western medicine, we use 片(pian) for pill, 粒(li) for capsule，and 支（zhi) for bottled liquids, 袋（dai) for pouch, and 板（ban) for foiled pills

this link is about ancient Chinese weighing metrics http://en.wikipedia.org/wiki/Chinese_units_of_measurement