| Ambenonium Action Pathway (new) |  | Drug Action | Choline / Ambenonium / Calcium / Magnesium cation / Acetylcholine / Acetic acid |
| Ambrisentan Predicted Metabolism Pathway |  | Metabolic | Mesoheme / Ambrisentan |
| Ambroxol Predicted Metabolism Pathway |  | Metabolic | Mesoheme / Ambroxol |
| Amcinonide Action Pathway |  | Drug Action | Glutathione / Amcinonide / Dinoprostone / Calcium / Prostaglandin D2 / Mesoheme / Prostaglandin G2 / Arachidonic Acid |
| Amifampridine Action Pathway |  | Drug Action | Choline / ATP / Potassium cation / Calcium / Magnesium cation / Cyclic adenosine monophosphate / Acetylcholine / Acetic acid / Amifampridine |
| Amifostine Drug Metabolism |  | Metabolic | Amifostine |
| Amikacin Action Pathway |  | Drug Action | Amikacin |
| Amikacin Action Pathway (new) |  | Drug Action | Amikacin |
| Amiloride Action Pathway |  | Drug Action | Cysteine / Amiloride / Potassium cation / Urea |
| Amiloride Action Pathway (New) |  | Drug Action | Amiloride / Potassium cation / Urea |
| Amine Oxidase Norepinephrine |  | Physiological | Pyridoxal phosphate / Ademetionine / Ascorbic acid / Tyrosine / NADH / Sapropterin / Norepinephrine / Dopamine / Levodopa / Magnesium cation / Iron / Flavin adenine dinucleotide / Pyrroloquinoline Quinone |
| Amine Oxidase Serotonin |  | Physiological | Pyridoxal phosphate / Tryptophan / Sapropterin / Calcium / Iron / Oxitriptan / Flavin adenine dinucleotide |
| Amino Sugar Metabolism |  | Metabolic | Pyruvic acid / L-Glutamine / N-Acetylglucosamine / Glutamic acid / ATP / Glucosamine / Magnesium cation / Phosphoenolpyruvate / Cytidine-5'-Triphosphate / Acetic acid / Uridine-5'-Diphosphate / Pyrophosphoric acid / Fructose |
| Aminocaproic Acid Action Pathway |  | Drug Action | Aminocaproic acid / Phylloquinone / Calcium |
| Aminophenazone Predicted Metabolism Pathway |  | Metabolic | Aminophenazone / Mesoheme |
| Aminophylline Drug Metabolism |  | Metabolic | Aminophylline |
| Amiodarone Action Pathway |  | Drug Action | ATP / Amiodarone / Potassium cation / Calcium / Cyclic adenosine monophosphate |
| Amiodarone Action Pathway (New) |  | Drug Action | ATP / Amiodarone / Potassium cation / Calcium / Cyclic adenosine monophosphate |
| Amisulpride Predicted Metabolism Pathway |  | Metabolic | Mesoheme / Amisulpride |
| Amisulpride Serotonin Antagonist Action Pathway |  | Drug Action | Pyridoxal phosphate / Tryptophan / Sapropterin / Calcium / Iron / Oxitriptan / Amisulpride |
| Amitriptyline Norepinephrine Reuptake Inhibitor Action Pathway |  | Drug Action | Pyridoxal phosphate / Ascorbic acid / Tyrosine / Amitriptyline / Sapropterin / Norepinephrine / Dopamine / Levodopa / Calcium / Iron / Pyrroloquinoline Quinone |
| Amitriptyline Serotonin Antagonist Action Pathway |  | Drug Action | Pyridoxal phosphate / Tryptophan / Amitriptyline / Sapropterin / Calcium / Iron / Oxitriptan |
| Amitriptylinoxide Drug Metabolism |  | Metabolic | Amitriptylinoxide |
| Amlodipine Action Pathway |  | Drug Action | ATP / Amlodipine / Potassium cation / Calcium |
| Amlodipine Smooth Muscle Relaxation Action Pathway |  | Drug Action | ATP / Amlodipine / Calcium / Magnesium cation |