By API Standards
- Macitentan
- Maltitol
- Maraviroc
- Mebeverine
- Meclizine
- Medroxyprogesterone
- MefenaMic
- Meloxicam
- Memantine
- Mesalamine
- Mesalazine
- Mesotrione
- Mestranol
- Metformin
- Methimazole
- Methocarbamol
- Methotrimeprazine
- Methsuximide
- Methyl Naltrexone
- Methyldopa
- Methylnaltrexone
- Methylprednisolone
- Metolazone
- Metoprolol
- Metronidazole
- Mexiletine
- Midodrine
- Midostaurin
- Mirabegron
- Mirtazapine
- Misoprostol
- MK-1775
- MK-1776
- Modafinil
- Mometasone
- Montelukast
- Moxifloxacin
- Mycophenolate
- Mycophenolic acid