- Labetalol
- Lactulose
- Laetrile
- Lamivudine
- Lamotrigine
- Lanatoside C
- Lansoprazole
- Leflunomide
- Leucovorin
- Leuprolide
- Levallorphan
- Levodopa
- Levofloxacin
- Levorphanol
- Levothyroxine
- Lidocaine
- Lincomycin
- Lindane
- Linezolid
- Liothyronine
- Liotrix
- Lipids
- Lisinopril
- Lithium
- Lomefloxacin
- Loperamide
- Loracarbef
- Loratadine
- Lorazepam
- Losartan
- Lovastatin
- Loxapine
- Lynestrenol
- Lypressin
- Lysergic Acid Diethylamide
- L-Lysine
