The Collaborative International Dictionary of English v.0.48:

Pharmacology \Phar`ma*col"o*gy\, n. [Gr. fa`rmakon drug + -logy:
   cf. F. pharmacologie.]
   1. The science dealing with knowledge of the preparation,
      use, and effects of drugs or medicines; the art of
      preparing medicines.
      [1913 Webster]

   2. A treatise on the art of preparing medicines.
      [1913 Webster]

WordNet (r) 3.0 (2006):

pharmacology
    n 1: the science or study of drugs: their preparation and
         properties and uses and effects [syn: pharmacology,
         pharmacological medicine, materia medica]

Moby Thesaurus II by Grady Ward, 1.0:

42 Moby Thesaurus words for "pharmacology":
   aerobiology, agrobiology, anatomy, astrobiology, bacteriology,
   biochemics, biochemistry, biochemy, bioecology, biological science,
   biology, biometrics, biometry, bionics, bionomics, biophysics,
   botany, cell physiology, cryobiology, cybernetics, cytology,
   ecology, electrobiology, embryology, enzymology, ethnobiology,
   exobiology, genetics, gnotobiotics, life science, materia medica,
   microbiology, molecular biology, pharmaceutics, pharmacy,
   physiology, posology, radiobiology, taxonomy, virology,
   xenobiology, zoology