L
- Labetalol
- Lacidipine
- Lacosamide
- Lamivudine
- Lamotrigine
- LAMPA
- Lanatoside C
- Lansoprazole
- Lapatinib
- Laudanosine
- Lenacil
- Lercanidipine
- Letrozole
- Leuprolide
- Levacetylmethadol (LAAM)
- Levamisole
- Levamisole/tetramisole
- Levetiracetam
- Levocabastine
- Levodopa
- Levofloxacin
- Levomepromazine
- Levomepromazine-M (desmethyl)
- Levomepromazine-M (sulfoxide desmethyl)
- Levomethadyl acetate
- Levorphanol
- Levorphanol/dextrophan
- Levothyroxine
- LGD-2226
- LH-21
- LHRH
- Lidocaine
- Lidocaine-M (MEGX; N deethylated metabolite)
- Lidoflazine
- Lisdexamphetamine
- Lisinopril
- Lofendazam
- Lofentanil
- Lofepramine
- Lomefloxacin
- Loperamide
- Loperamide, demethyl
- Loperamide-M, (N-didesmethyl)
- Lopinavir
- Lopirazepam
- Loprazolam
- Loratidine
- Lorazepam
- Lorazepam-M (glucuronide)
- Lormetazepam
- Losartan
- Lovastatin
- Loxapine
- Loxapine-7-hydroxy
- Loxapine-8-hydroxy
- Loxoprofen
- LSA
- LSD
- LSD-M (2-Oxo-hydroxy metabolite)
- LSM-775
- LSZ
- Lurasidone
- LY2183240
- Lysergic acid 1,4-dimethylazetidide
- Lysergic acid amide
- Lysergic acid methyl ester
- Lysergic acid methylester