- M S Contin
- M-Caps
- M-Eslon
- M-M-R II
- M-R-VAX II
- M.O.S.
- M.O.S.-S.R.
- MCT Oil
- MGP
- MICRhoGAM
- MS Contin
- MS/L
- MS/L Concentrate
- MS/S
- MSIR
- MS˙IR
- MTX
- MZM
- Maalox
- Maalox Antacid Caplets
- Maalox Anti-Diarrheal
- Maalox Anti-Gas
- Maalox GRF Gas Relief Formula
- Maalox H2 Acid Controller
- Maalox HRF
- Maalox Heartburn Relief Formula
- Maalox Plus
- Maalox Plus, Extra Strength
- Maalox TC
- Macrobid
- Macrodantin
- Mafenide
- Mag 2
- Mag-200
| - Mag-L-100
- Mag-Ox
- Mag-Ox 400
- Mag-Tab SR
- Magan
- Maglucate
- Magnacal
- Magnalox
- Magnalox Plus
- Magnaprin
- Magnesium Gluconate
- Magnesium Hydroxide
- Magnesium Oxide
- Magnesium Supplements
- Magnesium-Rougier
- Magnolax
- Magonate
- Magtrate
- Majeptil
- Malarone
- Malatal
- Malathion
- Mallamint
- Malogen in Oil
- Maltsupex
- Mandelamine
- Mandol
- Manerix
- Mangafodipir
- Mantadil containing Hydrocortisone Acetate and Chlorcyclizine Hydrochloride
- Maolate
- Maox
- Maox 420
| - Mapap Cold Formula
- Maprotiline
- Marax
- Marax-DF
- Marblen
- Marcaine
- Marcaine Spinal
- Marcof Expectorant
- Marezine
- Margesic #3
- Margesic-H
- Marinol
- Marnal
- Marplan
- Marthritic
- Marvelon
- Marzine
- Masoprocol
- Masporin Otic
- Matulane
- Mavik
- Max-Caro
- Maxafil Cream
- Maxair
- Maxair Autohaler
- Maxalt
- Maxalt-MLT
- Maxaquin
- Maxenal
- Maxidex
- Maxidone ES containing Acetaminophen and Hydrocodone Bitartrate
- Maxiflor
- Maximum Strength Arthritis Foundation Safety Coated Aspirin
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