| Mixed sodium/potassium channel blockers | Not Available | 0 | 0 | Details |
| Moderate Risk QTc-Prolonging Agents | Drugs that have demonstrated moderate QTc interval prolongation in either animal or hum... more | 113 | 930 | Details |
| Molecular Chaperones | A family of cellular proteins that mediate the correct assembly or disassembly of polyp... more | 3 | 0 | Details |
| Molecular Probes | A group of atoms or molecules attached to other molecules or cellular structures and us... more | 10 | 15 | Details |
| Molecular Sequence Data | Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have a... more | 0 | 0 | Details |
| Molecular Structure | The location of the atoms, groups or ions relative to one another in a molecule, as wel... more | 0 | 0 | Details |
| Mollusca | Not Available | 1 | 1 | Details |
| Molluscacides | Agents destructive to snails and other mollusks. | 1 | 3 | Details |
| Mollusk Venoms | Venoms from mollusks, including CONUS and OCTOPUS species. The venoms contain proteins,... more | 3 | 2 | Details |
| Monkeypox Vaccines | Vaccines used to protect against monkeypox virus. | 1 | 0 | Details |
| Monoamine Oxidase A Inhibitors | Not Available | 4 | 32 | Details |
| Monoamine Oxidase A Inhibitors for interaction with Monoamine Oxidase A substrates | This category has been created to cover the interactions between monoamine oxidase A (M... more | 31 | 315 | Details |
| Monoamine Oxidase A Substrates | Drugs that are metabolized either partially or completely by Monoamine Oxidase A (MAO-A... more | 14 | 146 | Details |
| Monoamine Oxidase B Inhibitors | Not Available | 4 | 45 | Details |
| Monoamine Oxidase Inhibitors | A chemically heterogeneous group of drugs that have in common the ability to block oxid... more | 33 | 155 | Details |
| Monoamine Oxidase Inhibitors, Non-Selective | Not Available | 6 | 34 | Details |
| Monobactam Antibacterial | Not Available | 1 | 3 | Details |
| Monobactams | Monocyclic, bacterially produced or semisynthetic beta-lactam antibiotics. They lack th... more | 2 | 3 | Details |
| MONOCLONAL ANTIBODIES AND ANTIBODY DRUG CONJUGATES | Not Available | 51 | 116 | Details |
| Monocyclic Sesquiterpenes | Sesquiterpene compounds that contain a single ring structure. | 1 | 0 | Details |
| Monokines | Soluble mediators of the immune response that are neither antibodies nor complement. Th... more | 2 | 0 | Details |
| Monophenol Monooxygenase | Not Available | 1 | 0 | Details |
| Monophenol Monooxygenase, antagonists & inhibitors | Not Available | 1 | 0 | Details |
| Monophenol Monooxygenase, drug effects | Not Available | 1 | 0 | Details |
| Monosaccharides | Simple sugars, carbohydrates which cannot be decomposed by hydrolysis. They are colorle... more | 27 | 141 | Details |