Prime
- M.V.I.
- Maalox
- Maalox Antacid Caplets
- Maalox Antidiarrheal Caplets
- Macrobid
- Macrodantin
- magaldrate
- Magan
- maggi plant
- magnesium and aluminum salts
- magnesium chloride
- magnesium citrate
- magnesium gluconate
- magnesium hydroxide
- magnesium hydroxide/aluminum hydroxide
- magnesium oxide
- magnesium salicylate
- magnesium salts
- magnesium sulfate (iv) (9.9% mg; 8.1 meq mg/g)
- Magonate
- Mag-Ox 400
- Magtrate
- Ma huang
- maidenhair-tree
- malathion
- Mallamint
- Malogen
- Malogex
- Malrone
- mannitol
- Maox
- Mapap
- maprotiline
- Maranox
- Marax
- Marcaine
- Marcillin
- Margesic
- Margesic-H
- Marinol
- Marten-Tab
- Marthritic
- Mary Thistle
- mast cell stabilizers
- Matulane
- Mavik
- Maxair
- Maxalt
- Maxaquin
- Maxeran
- Maxiflor
- Maximum Relief Ex-Lax
- Maxipime
- Maxitrol Ophthalmic Suspension/Ointment
- Maxivate
- Maxzide
- mebendazole
- mechlorethamine
- meclizine
- meclofenamate
- Meclomen
- Meda
- Medicone
- Medi-Flu-Liquid
- Medigesic
- Medihaler-Iso
- Medipren
- Mediquell
- Medralone
- Medrol
- medroxyprogesterone
- Mefoxin
- Mega-C/A Plus
- Megace
- Megacillin
- megestrol
- Mellaril
- Mellaril-S
- meloxicam
- melphalan
- Menadol
- Menaval
- Meni-D
- menotropins
- Mentax
- Mepergan Fortis
- meperidine
- Mephyton
- meprobamate
- Mepron
- mercaptopurine
- Meridia
- meropenem
- Merrem
- mesalamine
- M-Eslon
- mesna
- Mesnex
- mesoridazine
- Mestinon
- mestranol/norethindrone
- Metadate
- Metaderm
- Metaglip
- Metamucil
- metaproterenol
- Metastron
- metaxalone
- metformin
- methadone
- Methadose
- Methergine
- methimazole
- methocarbamol
- methohexital
- methotrexate
- methotrimeprazine
- methyldopa
- methylergonovine
- Methylin
- methylphenidate
- methylprednisolone
- methysergide
- Meticorten
- Metimyd Ophthalmic Suspension/Ointment
- metoclopramide
- metocurine
- metolazone
- metoprolol
- Metric
- MetroCream
- MetroGel
- MetroGel-Vaginal
- MetroLotion
- metronidazole
- Metryl
- Metubine
- Mevacor
- Mexican Valerian
- mexiletine
- Mexitil
- Mezlin
- mezlocillin
- Miacalcin
- Micardis
- Micardis HCT
- Micatin
- miconazole
- Microgestin
- Microgestin Fe
- Micronase
- microNefrin
- Microzide
- Midamor
- midazolam
- Midol
- Midrin
- Mifeprex
- mifepristone
- miglitol
- Migranal
- Miles Nervine
- Milkinol
- Milophene
- milrinone
- Miltown
- mineral oil
- Mini-Gamulin R
- Minipress
- Minitran
- Minizide
- Minocin
- minocycline
- minoxidil (systemic)
- Mintox
- Minute-Gel
- Mio-Rel
- MiraLax
- Mirapex
- Mircette
- Mirena
- mirtazapine
- misoprostol
- Mithracin
- Mithramycin
- MitoExtra
- mitomycin
- mitotane
- mitoxantrone
- Mitrolan
- Mivacron
- mivacurium
- Moban
- Mobenol
- Mobic
- Mobidin
- modafinil
- Modane
- Modane Bulk
- Modane Soft
- Modecate
- Modicon
- Moditen
- Moduretic
- moexipril
- Moi-Stir
- molindone
- MOM
- mometasone
- Monafed
- Monistat
- Monistat-Derm
- Monitan
- monoamine oxidase inhibitors
- monobasic potassium and sodium phosphates
- monobasic potassium phosphate
- Monocid
- Monoclate-P
- Monocor
- Monodox
- Mono-Gesic
- Monoket
- Mononine
- monophasic oral contraceptives
- Monopril
- Monopril-HCT
- montelukast
- Monurol
- moricizine
- morphine
- Morphine H.P.
- Morphitec
- Motofen
- Motrin
- Motrin IB
- mountain snuff
- mountain tobacco
- Mouthkote
- MouthKote F/R
- moxifloxacin
- M-Oxy
- MS Contin
- MSIR
- MSO4
- Mucinex
- Mucomyst
- Mucosil
- Multipax
- multiple vitamins
- Multi Vitamin Concentrate
- mupirocin
- Murocoll-2 Ophthalmic Drops
- muromonab-cd3
- MUSE
- Mustargen
- Mutamycin
- Myambutol
- Mycelex
- Mycelex-3
- Mycifradin
- Myciguent
- Mycinettes
- Myclo
- Myclo-Gyne
- Mycobutin
- Mycolog II Topical
- mycophenolate
- Mycostatin
- Myidone
- Mykrox
- Mylanta
- Mylanta Gas
- Mylanta Lozenges
- Mylanta Natural Fiber Supplement
- Myleran
- Mylicon
- Mylocel
- Mylotarg
- Myolin
- Myotrol
- Myrosemide
- Mysoline
- Mytussin
- M-Zole 3