ICD-10-CM
- GABA
- Gadolinium
- Gadopentetic acid
- Galactose
- Galantamine
- Gallamine (triethiodide)
- Gallium citrate
- Gallopamil
- Gamboge
- Gamimune
- Gamma-aminobutyric acid
- Gamma-benzene hexachloride (medicinal)
- Gamma-BHC (medicinal)
- Gamma globulin
- Gamulin
- Ganciclovir (sodium)
- Ganglionic blocking drug NEC
- Ganja
- Garamycin
- Gardenal
- Gardepanyl
- Gaseous substance
- Gas NEC
- Gasoline
- Gastric enzymes
- Gastrografin
- Gastrointestinal drug
- Gaultheria procumbens
- Gefarnate
- Gelatin (intravenous)
- Gelfilm
- Gelfoam
- Gelsemine
- Gelsemium (sempervirens)
- Gemeprost
- Gemfibrozil
- Gemonil
- Gentamicin
- Gentian
- Gepefrine
- Gestonorone caproate
- Gexane
- Gila monster (venom)
- Ginger
- Gitalin
- Gitaloxin
- Gitoxin
- Glafenine
- Glandular extract (medicinal) NEC
- Glaucarubin
- Glibenclamide
- Glibornuride
- Gliclazide
- Glimidine
- Glipizide
- Gliquidone
- Glisolamide
- Glisoxepide
- Globin zinc insulin
- Globulin
- Glucagon
- Glucocorticoids
- Glucocorticosteroid
- Gluconic acid
- Glucosamine sulfate
- Glucose
- Glucosulfone sodium
- Glucurolactone
- Glue NEC
- Glutamic acid
- Glutaral (medicinal)
- Glutaraldehyde (nonmedicinal)
- Glutathione
- Glutethimide
- Glyburide
- Glycerin
- Glycerol
- Glycerophosphate
- Glyceryl
- Glycine
- Glyclopyramide
- Glycobiarsol
- Glycols (ether)
- Glyconiazide
- Glycopyrrolate
- Glycopyrronium
- Glycoside, cardiac (stimulant)
- Glycyclamide
- Glycyrrhiza extract
- Glycyrrhizic acid
- Glycyrrhizinate potassium
- Glymidine sodium
- Glyphosate
- Glyphylline
- Gold
- Golden sulfide of antimony
- Goldylocks
- Gonadal tissue extract
- Gonadorelin
- Gonadotropin
- Goserelin
- Grain alcohol
- Gramicidin
- Granisetron
- Gratiola officinalis
- Grease
- Green hellebore
- Green soap
- Grifulvin
- Griseofulvin
- Growth hormone
- Guaiacol derivatives
- Guaiac reagent
- Guaifenesin
- Guaimesal
- Guaiphenesin
- Guamecycline
- Guanabenz
- Guanacline
- Guanadrel
- Guanatol
- Guanethidine
- Guanfacine
- Guano
- Guanochlor
- Guanoclor
- Guanoctine
- Guanoxabenz
- Guanoxan
- Guar gum (medicinal)