ICD-10-CM
- Labetalol
- Laburnum (seeds)
- Lachesine
- Lacidipine
- Lacquer
- Lacrimogenic gas
- Lactated potassic saline
- Lactic acid
- Lactobacillus
- Lactoflavin
- Lactose (as excipient)
- Lactuca (virosa) (extract)
- Lactucarium
- Lactulose
- Laevo
- Lanatosides
- Lanolin
- Largactil
- Larkspur
- Laroxyl
- Lasix
- Lassar's paste
- Latamoxef
- Latex
- Lathyrus (seed)
- Laudanum
- Laudexium
- Laughing gas
- Laurel, black or cherry
- Laurolinium
- Lauryl sulfoacetate
- Laxative NEC
- L-dopa
- Lead (dust) (fumes) (vapor) NEC
- Lebanese red
- Lefetamine
- Lenperone
- Lente Iletin (insulin)
- Leptazol
- Leptophos
- Leritine
- Letosteine
- Letter
- Lettuce opium
- Leucinocaine
- Leucocianidol
- Leucovorin (factor)
- Leukeran
- Leuprolide
- Levalbuterol
- Levallorphan
- Levamisole
- Levanil
- Levarterenol
- Levdropropizine
- Levobunolol
- Levocabastine (hydrochloride)
- Levocarnitine
- Levodopa
- Levo-dromoran
- Levoglutamide
- Levoid
- Levo-iso-methadone
- Levomepromazine
- Levonordefrin
- Levonorgestrel
- Levopromazine
- Levoprome
- Levopropoxyphene
- Levopropylhexedrine
- Levoproxyphylline
- Levorphanol
- Levothyroxine
- Levsin
- Levulose
- Lewisite (gas), not in war
- Librium
- Lidex
- Lidocaine
- Lidofenin
- Lidoflazine
- Lighter fluid
- Lignin hemicellulose
- Lignocaine
- Ligroin (e) (solvent)
- Ligustrum vulgare
- Lily of the valley
- Lime (chloride)
- Limonene
- Lincomycin
- Lindane (insecticide) (nonmedicinal) (vapor)
- Liniments NEC
- Linoleic acid
- Linolenic acid
- Linseed
- Liothyronine
- Liotrix
- Lipancreatin
- Lipo-alprostadil
- Lipo-Lutin
- Lipotropic drug NEC
- Liquefied petroleum gases
- Liquid
- Liquor creosolis compositus
- Liquorice
- Lisinopril
- Lisuride
- Lithane
- Lithium
- Lithonate
- Liver
- Lizard (bite) (venom)
- LMD
- lmmu-G
- Lobelia
- Lobeline
- Local action drug NEC
- Locorten
- Lofepramine
- Lolium temulentum
- Lomotil
- Lomustine
- Lonidamine
- Loperamide
- Loprazolam
- Lorajmine
- Loratidine
- Lorazepam
- Lorcainide
- Lormetazepam
- Lotions NEC
- Lotusate
- Lovastatin
- Lowila
- Loxapine
- Lozenges (throat)
- LSD
- L-Tryptophan
- Lubricant, eye
- Lubricating oil NEC
- Lucanthone
- Luminal
- Lung irritant (gas) NEC
- Luteinizing hormone
- Lutocylol
- Lutromone
- Lututrin
- Lye (concentrated)
- Lygranum (skin test)
- Lymecycline
- Lymphogranuloma venereum antigen
- Lynestrenol
- Lyovac Sodium Edecrin
- Lypressin
- Lysergic acid diethylamide
- Lysergide
- Lysine vasopressin
- Lysol
- Lysozyme
- Lytta (vitatta)