| Measles virus (veiklaðar) |
| Medroxyprogesteronum INN acetat |
| Mercaptaminum INN bítartrat |
| Meropenemum INN tríhýdrat |
| Methenaminum INN hippúrat |
| Methoxy polyethylen glycol-epoetinum beta INN |
| Methyl aminolevulinate hydrochloride |
| Methylergometrinum INN maleat |
| Methylhydroxypropylcellulosum INN |
| Methylphenidatum INN klóríð |
| Methylprednisolonum INN acetat |
| Methylprednisolonum INN natríumsúkkínat |