| Loratadine and derivatives | Not Available | 2 | 19 | Details |
| Low-Ceiling Diuretics and Potassium-Sparing Agents | Not Available | 9 | 28 | Details |
| Low-Ceiling Diuretics, Excl. Thiazides | Not Available | 15 | 38 | Details |
| Lubricants | Compounds that provide LUBRICATION between surfaces in order to reduce FRICTION. | 1 | 17 | Details |
| Luminescent Agents | Compound such as LUMINESCENT PROTEINS that cause or emit light (PHYSICAL LUMINESCENCE). | 18 | 46 | Details |
| Luminescent Measurements | Not Available | 1 | 1 | Details |
| Luminescent Proteins | Not Available | 1 | 1 | Details |
| Lung Surfactants | Not Available | 1 | 4 | Details |
| Lupanes | Pentacyclic triterpenes with isopropyl and its derivatives at the C19 position. It is i... more | 2 | 2 | Details |
| Luteolytic Agents | Chemical compounds causing LUTEOLYSIS or degeneration. | 4 | 22 | Details |
| Lutetium | Not Available | 3 | 10 | Details |
| Lyases | A class of enzymes that catalyze the cleavage of C-C, C-O, and C-N, and other bonds by ... more | 6 | 9 | Details |
| Lymphocyte Activation | Not Available | 1 | 1 | Details |
| Lymphocyte Activation Gene-3 Blocker | Not Available | 1 | 1 | Details |
| Lymphocyte Function Alteration | Not Available | 2 | 9 | Details |
| Lymphocyte Function-Associated Antigen-1 | Not Available | 2 | 5 | Details |
| Lymphocyte Function-Associated Antigen-1 Antagonist | Not Available | 1 | 5 | Details |
| Lymphocyte Function-Associated Antigen-1 Antagonists | Not Available | 1 | 5 | Details |
| Lymphocyte Growth Factor | Not Available | 1 | 9 | Details |
| Lymphohistiocytosis, Hemophagocytic | Not Available | 1 | 1 | Details |
| Lymphokines | Soluble protein factors generated by activated lymphocytes that affect other cells, pri... more | 9 | 23 | Details |
| Lymphoma, B-Cell | Not Available | 2 | 2 | Details |
| Lymphotoxin-alpha, antagonists & inhibitors | Not Available | 1 | 1 | Details |
| Lysergic Acid | Cyclic compounds that include atoms other than carbon in their ring structure. | 2 | 15 | Details |
| Lysine | An essential amino acid. It is often added to animal feed. | 3 | 9 | Details |