The term posology (greek posos,how much;and logos,science)is the science of doses.
all pharmacopoeias prescribe the doses of drugs for internal use..
The dose is to be decided by the prescriber depending upon patients age ,sex ,symptoms,his medication history and the factors like tolerance,idiosyncrasy(morphine may produce excitation in some individuals,specially women ,although normally it depress CNS,
route of administration etc.
Thanks
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