By API Standards
- Mabuterol
- Macitentan
- Mancozeb
- Maraviroc
- Maropitant
- Masitinib
- Maytansinol
- Mebeverine
- Meclizine
- Medroxyprogesterone
- MefenaMic
- Melatonin
- Meloxicam
- Memantine
- Mesalamine
- Mesalazine
- Mesotrione
- Mestranol
- Metamizole
- Metformin
- Methimazole
- Methocarbamol
- Methotrimeprazine
- Methsuximide
- Methyl Naltrexone
- Methyl Paraben
- Methyldopa
- Methylmalonic Acid
- Methylnaltrexone
- Methylprednisolone
- Metolazone
- Metoprolol
- Metronidazole
- Mexiletine
- Midodrine
- Midostaurin
- Minocycline
- Mirabegron
- Mirogabalin
- Mirtazapine
- MK-1775
- MK-1776
- Modafinil
- Molnupiravir
- Mometasone
- Momordin Ic
- Mononucleotide
- Montelukast
- Mycophenolate
- Mycophenolic acid
- Myristic acid