| Lumicitabine | 1445385-02-3 | Dental and Oral Agents | 0 |
| Lumiflavin | 1088-56-8 | Enzyme Replacements/modifiers | 0 |
| Lumiliximab | 357613-86-6 | Other substances | 0 |
| Luminol | 521-31-3 | | 0 |
| Lumiracoxib | 220991-20-8 | | 0 |
| Lumretuzumab | 1448327-63-6 | Other substances | 0 |
| Lunasine | 6901-22-0 | | 0 |
| Lupeol | 545-47-1 | Anti-inflammatory Agents | 0 |
| Luprostiol | 67110-79-6 | | 0 |
| Lurtotecan | 149882-10-0 | Anticancer drugs | 0 |
| Lusacomfar Alfa | 2640087-71-2 | Other substances | 0 |
| Luspatercept | 1373715-00-4 | Other substances | 0 |
| Lusutrombopag | 1110766-97-6 | Hematological Agents | 0 |
| Luteinizing hormone | 9002-67-9 | Hormonal Agents | 0 |
| Lutetium Lu177 Edotreotide | 321835-55-6 | Other substances | 0 |
| Lutikizumab | 1791411-57-8 | Other substances | 0 |
| Lutropin alfa | 152923-57-4 | | 0 |
| Luvadaxistat | 1425511-32-5 | Other substances | 0 |
| Lynestrenol | 52-76-6 | Genitourinary Agents | 0 |
| Lysergic Acid Diethylamide | 50-37-3 | | 0 |
| Lysophosphotidylserine | | | 0 |
| Macelignan | 107534-93-0 | Antioxidants | 0 |
| Macimorelin | 381231-18-1 | Hormonal Agents | 0 |
| Macozinone | 1377239-83-2 | Anti-infective Agents | 0 |
| Macrogol Cetostearyl Ether 30 | | | 0 |
| Macrogol cetostearyl ether 12 | | | 0 |
| Macrogol poly(vinyl alcohol) grafted copolymer | | | 0 |
| Macrogolglycerol hydroxystearate | | | 0 |
| Macrogolglycerol ricinoleate 35 | | | 0 |
| Madecassic acid | 18449-41-7 | | 0 |
| Madecassoside | 34540-22-2 | | 0 |
| Maduramicin | 84878-61-5 | Anti-infective Agents | 0 |
| Mafosfamide | 88859-04-5 | Antineoplastics | 0 |
| Maftivimab | 2135632-36-7 | Anti-infective Agents | 0 |
| Magnesium acetate | 142-72-3 | | 0 |
| Magnesium ascorbate | 15431-40-0 | Antioxidants | 0 |
| Magnesium aspartate hydrochloride | 28184-71-6 | | 0 |
| Magnesium levulinate | 58505-81-0 | Electrolytes | 0 |
| Magnesium malate | 869-06-7 | | 0 |
| Magnesium peroxide | 14452-57-4 | Gastrointestinal Agents | 0 |