- M2 Potassium
- Macugen
- Magnevist
- Makena
- Malarone
- Mangimin
- Marinol
- Marplan
- Marqibo
- Matulane
- Mavik
- Maxair
- Maxalt
- Maxidex Ointment
- Maxidex Suspension/Drops
- Maxipime
- Mb Tab
- ME-500
- Meclomen
- Medrol
- Medroxyprogesterone Acetate
- Mefoxin
- Megace
- Meglumine Antimoniate
- Mekinist
- Meloxicam
- MembraneBlue
- Menactra
- Menest
- Menhibrix
- Meningococcal Vaccine
- Mentax
- Mephyton
- Mepron
- Merrem IV
- Meruvax II
- Mesnex
- Metaglip
- Metastron
- Methadose
- Methergine
- Methylene Blue
- Methylin
- Methylprednisolone
- Metopirone
- Metoprolol
- Metozolv ODT
- Metrocream
- Metrogel-Vaginal
- Metronidazole
- Metvixia
- Mexitil
- Miacalcin
- Micardis
- Micardis HCT
- Microzide
- Midamor
- Migranal
- Minipress
- Minitran
- Minocin
- Minocycline
- Mintezol
- Mirapex
- Mircera
- Mirvaso
- Mithracin
- Mitosol
- MMR-II
- Moban
- Moclobemide
- Moduretic 5-50
- Molypen
- Monistat
- Monoctanoin
- Monopril
- Monopril HCT
- Monurol
- Motofen
- Movantik
- MoviPrep
- Moxeza
- Mozobil
- MPI DMSA
- MPI MAA
- MS-IR
- Mucinex
- Mucomyst
- Multaq
- Multihance
- Mumpsvax
- Muse
- Mustargen
- Mutamycin
- Myalept
- Myambutol
- Mycamine
- Mycelex Troche
- Mycobutin
- Mycolog
- Mycolog-II
- Mycostatin
- Mydral
- Myfortic
- Mykrox
- Myleran
- Myobloc
- Myoview
- Myphetane Dx
- Myrbetriq
- Mysoline
- Mytelase