polypharmacy

from The Collaborative International Dictionary of English v.0.48

Polypharmacy \Pol`y*phar"ma*cy\, n. [Poly- + Gr. ? the using of
   medicine, fr. ? medicine: cf. F. polypharmacie.] (Med.)
   (a) The act or practice of prescribing too many medicines.
   (b) A prescription made up of many medicines or ingredients.
       --Dunglison.
       [1913 Webster]