| Mefenamic Acid Action Pathway |  | Drug Action | Glutamic acid / Glutathione / Mefenamic acid / Dinoprostone / Calcium / Magnesium cation / Zinc / Prostaglandin D2 / Mesoheme / Prostaglandin G2 / Arachidonic Acid |
| Mefenamic Acid NSAID Action Pathway |  | Drug Action | Glutathione / Mefenamic acid / Dinoprostone / Calcium / Mesoheme / Prostaglandin G2 / Arachidonic Acid |
| Megestrol acetate Action Pathway |  | Drug Action | NADH / ATP / Megestrol acetate / Progesterone / Testosterone / Estrone / Potassium cation / Calcium / Magnesium cation / Androstenedione / Cyclic adenosine monophosphate / Mesoheme / Pyrophosphoric acid / Cholesterol / 2-Hydroxyestradiol |
| Meloxicam Action Pathway |  | Drug Action | Glutamic acid / Glutathione / Meloxicam / Dinoprostone / Calcium / Magnesium cation / Zinc / Prostaglandin D2 / Mesoheme / Prostaglandin G2 / Arachidonic Acid |
| Meloxicam NSAID Action Pathway |  | Drug Action | Glutathione / Meloxicam / Dinoprostone / Calcium / Mesoheme / Prostaglandin G2 / Arachidonic Acid |
| Meloxicam Predicted Metabolism Pathway |  | Metabolic | Meloxicam / Mesoheme |
| Melphalan Predicted Metabolism Pathway |  | Metabolic | Melphalan / Mesoheme |
| Memantine Action Pathway |  | Drug Action | L-Glutamine / Glutamic acid / Memantine / Calcium |
| Menthyl salicylate Action Pathway |  | Drug Action | Glutathione / Dinoprostone / Calcium / Mesoheme / Prostaglandin G2 / Arachidonic Acid / Menthyl salicylate |
| Menthyl salicylate Predicted Metabolism Pathway |  | Metabolic | Mesoheme / Menthyl salicylate |
| Meperidine opioid agonist Action Pathway |  | Drug Action | ATP / Meperidine / Calcium / Magnesium cation / Cyclic adenosine monophosphate / gamma-Aminobutyric acid / Pyrophosphoric acid / Sar9, Met (O2)11-Substance P |
| Meperidine Predicted Metabolism Pathway |  | Metabolic | Meperidine / Mesoheme |
| Mepivacaine Action Pathway |  | Drug Action | ATP / Norepinephrine / Mepivacaine / Dopamine / Potassium cation / Calcium |
| Meprobamate Action Pathway |  | Drug Action | Pyridoxal phosphate / Glutamic acid / ATP / Meprobamate / Calcium / Magnesium cation / Cyclic adenosine monophosphate / gamma-Aminobutyric acid / Pyrophosphoric acid |
| Meprobamate Drug Metabolism |  | Metabolic | Meprobamate |
| Mepyramine H1 Antihistamine Neurological Sleep Action Pathway |  | Drug Action | Pyridoxal phosphate / Histidine / Calcium / Mepyramine |
| Mepyramine H1 Antihistamine Smooth Muscle Relaxation Action Pathway |  | Drug Action | Calcium / Magnesium cation / Mepyramine |
| Mepyramine H1-Antihistamine Action |  | Drug Action | Calcium / Mepyramine |
| Mepyramine H1-Antihistamine Blood Vessel Constriction Action Pathway |  | Drug Action | Arginine / Citrulline / Sapropterin / Nitric Oxide / Calcium / Magnesium cation / Mesoheme / Flavin adenine dinucleotide / Flavin mononucleotide / Mepyramine |
| Mepyramine H1-Antihistamine Immune Response Action Pathway |  | Drug Action | Calcium / Mepyramine |
| Mequinol Predicted Metabolism Pathway |  | Metabolic | Mesoheme / Mequinol |
| Mequitazine H1 Antihistamine Smooth Muscle Relaxation Action Pathway |  | Drug Action | Mequitazine / Calcium / Magnesium cation |
| Mequitazine H1-Antihistamine Action |  | Drug Action | Mequitazine / Calcium |
| Mequitazine H1-Antihistamine Blood Vessel Constriction Action Pathway |  | Drug Action | Arginine / Citrulline / Sapropterin / Nitric Oxide / Mequitazine / Calcium / Magnesium cation / Mesoheme / Flavin adenine dinucleotide / Flavin mononucleotide |
| Mequitazine H1-Antihistamine Immune Response Action Pathway |  | Drug Action | Mequitazine / Calcium |