| MC-Val-Cit-PAB | 159857-80-4 | | 1 |
| MES Hydrate | | Other calcium Channel Blockers | 1 |
| MES Sodium | | Other calcium Channel Blockers | 1 |
| Mc-Val-Cit-PABC-PNP | 159857-81-5 | | 1 |
| Mc-Val-Cit-Pab-Carfilzomib Iodide | 2055896-83-6 | | 1 |
| Mc-Val-Cit-Pab-Exatecan | 2504068-28-2 | | 1 |
| Mc-Val-Cit-Pab-Mmae | 646502-53-6 | | 1 |
| Mc-Val-Cit-Pab-Mmaf | 863971-17-9 | | 1 |
| Mc-Val-Gt-Pab-Auristatine | 2055896-77-8 | | 1 |
| Meadowsweet herb | | Herbal remedies | 1 |
| Mebhydrolin Napadisylate | | Antihistamines | 1 |
| Mecamylamine | 60-40-2 | Nicotinic acid derivatives | 1 |
| Mecasermin | 68562-41-4 | Somatropin Agonists | 1 |
| Mechlorethamine | 51-75-2 | Alkylating agents | 1 |
| Meclizine Hydrochloride | 1104-22-9 | | 1 |
| Medetomidine hydrochloride | 86347-15-1 | | 1 |
| Meglumine | 6284-40-8 | Contrast Media | 1 |
| Meldonium | 86426-17-7 | | 1 |
| Meldrum's Acid | 2033-24-1 | | 1 |
| Melengestrol Acetate | 2919-66-6 | Progestagens | 1 |
| Melitracen Hydrochloride | 10563-70-9 | | 1 |
| Melperone | 3575-80-2 | | 1 |
| Melphalan hydrochloride | 3223-07-2 | | 1 |
| Menadione Sodium Bisulphite | 6147-37-1 | Vitamins | 1 |
| Menbutone | 74381-53-6 | | 1 |
| Menotropins | 61489-71-2 | Gonadotrophic | 1 |
| Mentha pulegium | | Herbal remedies | 1 |
| Menthae piperitae folium | | Herbal remedies | 1 |
| Menthae viridis folium | | Herbal remedies | 1 |
| Menthol Crystals | 89-78-1 | | 1 |
| Mepenzolate | 25990-43-6 | Anticholinergics/Parasympathemimetics | 1 |
| Mepolizumab | 196078-29-2 | Anti-asthma | 1 |
| Mesterolone | 1424-00-6 | Androgens | 1 |
| Metallic Silver Powder | 7440-22-4 | Antimicrobial agents | 1 |
| Methacycline | 914-00-1 | Tetracyclines | 1 |
| Methamphetamine | 537-46-2 | Psychostimulants | 1 |
| Methanesulfonic Anhydride | 7143-01-3 | | 1 |
| Methohexital | 151-83-7 | Intravenous anesthetics | 1 |
| Methopabate | 4093-29-2 | | 1 |
| Methsuximide | 77-41-8 | Adrenergic agents | 1 |