- Magnesium Sulfate
- Mandelic Acid
- Mannitol
- Maprotiline
- Marijuana
- Mazindol
- Mebanazine
- Mebendazole
- Mecamylamine
- Mechlorethamine
- Meclizine
- Meclofenamate
- Medroxyprogesterone
- Mefenamic Acid
- Mefloquine
- Meloxicam
- Melphalan
- Menadione
- Mepenzolate
- Meperidine
- Mephentermine
- Mephenytoin
- Mephobarbital
- Mepindolol
- Meprobamate
- Mercaptopurine
- Meropenem
- Mesalamine
- Mesoridazine
- Mestranol
- Metaproterenol
- Metaraminol
- Metformin
- Methacycline
- Methadone
- Methamphetamine
- Methantheline
- Methaqualone
- Metharbital
- Methazolamide
- Methdilazine
- Methenamine
- Methicillin
- Methimazole
- Methixene
- Methocarbamol
- Methotrexate
- Methotrimeprazine
- Methoxamine
- Methoxsalen
- Methscopolamine
- Methsuximide
- Methyclothiazide
- Methyldopa
- Methylene Blue
- Methylergonovine Maleate
- Methylphenidate
- Metoclopramide
- Metolazone
- Metoprolol
- Metrizamide
- Metrizoate
- Metronidazole
- Metyrosine
- Mexiletine
- Miconazole
- Midazolam
- Midodrine
- Mifepristone
- Miglitol
- Milrinone
- Mineral Oil
- Minocycline
- Minoxidil
- Mirtazapine
- Misoprostol
- Mitoxantrone
- Moexipril
- Molindone
- Montelukast
- Moricizine
- Morphine
- Moxalactam
- Moxifloxacin
- Mycophenolate Mofetil
