- gabapentin
- gadobutrol
- gadopentetic acid
- galangal
- gamma benzene hexachloride
- gamma globulin
- gamma-linolenic
- gamma-linolenic acid
- gatifloxacin
- gelatin
- gemfibrozil
- gemifloxacin
- gentamicin
- gentian
- gentiana
- gentiana lutea
- gestodene
- gestodene + ethinylestradiol
- ginger
- ginseng
- glibenclamide
- gliclazide
- glipizide
- glucosamine
- glucose
- glucuronamide
- glucuronolactone
- gluteraldehyde
- gluthiatone
- glycerin
- glycerine
- glycerol
- glyceryl guaiacolate
- glyceryl trinitrate
- glycerylguaiacolate
- glycogenum
- glycol monosalicylate
- gramicidin
- granisetron hydrochloride
- graphites
- green pepper
- griseofulvin
- guaifenesin
- guaiphenesin
- gum turpentine