- Maximum Strength Ascriptin
- Maximum Strength Cortaid
- Maximum Strength Doan's Analgesic Caplets
- Maximum Strength Gas Relief
- Maximum Strength Mylanta Gas Relief
- Maximum Strength Phazyme
- Maximum Strength SnapBack Stimulant Powders
- Maxipime
- Maxivate
- Maxzide
- Mazanor
- Measles Virus Vaccine Live
- Measles and Rubella Virus Vaccine Live
- Measles, Mumps, and Rubella Virus Vaccine Live
- Mebaral
- Mebendazole
- Mecamylamine
- Mechlorethamine
- Meclan
- Meclicot
- Meclizine
- Meclizine/Buclizine/Cyclizine
- Meclofenamate
- Meclomen
- Mectizan
- Med Glybe
- Med Valproic
- Medigesic
- Medihaler-Iso
- Mediplast
- Medipren
- Medipren Caplets
- Medivert
- Medotar
| - Medrol
- Medroxyprogesterone
- Medroxyprogesterone Injection
- Mefenamic Acid
- Mefloquine
- Mefoxin
- Mega-C/A Plus
- Megace
- Megace OS
- Megacillin
- Megestrol
- Meglumine Antimoniate
- Melarsoprol
- Melfiat
- Mellaril
- Mellaril Concentrate
- Mellaril-S
- Meloxicam
- Melphalan
- Memantine
- Menactra
- Menest
- Meni-D
- Meningococcal Polysaccharide Vaccine
- Meningococcal Vaccine, Diphtheria Conjugate
- Menomune
- Menopur
- Menotropins
- Mentax
- Mentholatum Lip Balm
- Menu Magic Instant Breakfast
- Menu Magic Milk Shake
- Mepergan Fortis containing Meperidine Hydrochloride and Promethazine Hydrochloride
| - Mepergan containing Meperidine Hydrochloride and Promethazine Hydrochloride
- Meperidine
- Meperidine Hydrochloride Injection
- Mephyton
- Meprobamate
- Meprobamate and Aspirin
- Meprogesic
- Meprogesic Q
- Meprolone
- Mepron
- Meprospan 200
- Meprospan-400
- Mequinol and Tretinoin
- Mercaptopurine
- Meridia
- Meritene
- Meropenem
- Meropenem Injection
- Merrem I.V.
- Merrem IV
- Mersyndol with Codeine
- Meruvax II
- Mesalamine
- Mesantoin
- Mesasal
- Mescolor
- Mescolor containing Chlorpheniramine Maleate, Methscopolamine Nitrate, and Pseudoephedrine Hydrochloride
- Mesna
- Mesnex
- Mesoridazine Oral
- Mestinon
- Mestinon Timespan
- Mestinon Timespans
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