| Diphenhydramine H1-Antihistamine Immune Response Action Pathway |  | Drug Action | Diphenhydramine / Calcium |
| Diphenoxylate Action Pathway |  | Drug Action | ATP / Norepinephrine / Dopamine / Diphenoxylate / Potassium cation / Calcium |
| Diphenoxylate Opioid Agonist Action Pathway |  | Drug Action | ATP / Diphenoxylate / Calcium / Magnesium cation / Cyclic adenosine monophosphate / Acetylcholine / Pyrophosphoric acid |
| Diphenylguanidine Drug Metabolism |  | Metabolic | Diphenylguanidine |
| Diphenylpyraline H1 Antihistamine Smooth Muscle Relaxation Action Pathway |  | Drug Action | Diphenylpyraline / Calcium / Magnesium cation |
| Diphenylpyraline H1-Antihistamine Action |  | Drug Action | Diphenylpyraline / Calcium |
| Diphenylpyraline H1-Antihistamine Blood Vessel Constriction Action Pathway |  | Drug Action | Arginine / Citrulline / Sapropterin / Nitric Oxide / Diphenylpyraline / Calcium / Magnesium cation / Mesoheme / Flavin adenine dinucleotide / Flavin mononucleotide |
| Diphenylpyraline H1-Antihistamine Immune Response Action Pathway |  | Drug Action | Diphenylpyraline / Calcium |
| Dipivefrin A2-Adrenergic Vasocontriction Action Pathway |  | Drug Action | ATP / Dipivefrin / Epinephrine / Calcium / Magnesium cation / Cyclic adenosine monophosphate |
| Dipivefrin B2-Adrenergic Ciliary Muscle Relaxation Action Pathway |  | Drug Action | ATP / Dipivefrin / Epinephrine / Potassium cation / Calcium / Magnesium cation / Cyclic adenosine monophosphate |
| Dipivefrin Predicted Metabolism Pathway |  | Metabolic | Dipivefrin / Mesoheme |
| Diprenorphine Action Pathway |  | Drug Action | ATP / Calcium / Magnesium cation / Diprenorphine / Cyclic adenosine monophosphate / gamma-Aminobutyric acid / Pyrophosphoric acid |
| Dipyridamole (Antiplatelet) Action Pathway |  | Drug Action | Dipyridamole / Zinc |
| Dipyridamole Action Pathway |  | Drug Action | Adenosine phosphate / ATP / Adenosine / Dipyridamole / Magnesium cation / Zinc / Cyclic adenosine monophosphate / Mesoheme / Inosine / Arachidonic Acid |
| Dipyridamole Phosphodiesterase Action Pathway |  | Drug Action | Adenosine phosphate / ATP / Adenosine / Dipyridamole / Magnesium cation / Zinc / Cyclic adenosine monophosphate / Mesoheme / Inosine / Arachidonic Acid |
| Dipyrithione Drug Metabolism |  | Metabolic | Dipyrithione |
| Diroximel fumarate Predicted Metabolism Pathway |  | Metabolic | Mesoheme / Diroximel fumarate |
| Disopyramide Action Pathway |  | Drug Action | ATP / Disopyramide / Potassium cation / Calcium |
| Disopyramide Cardiac Action Pathway |  | Drug Action | Disopyramide / Potassium cation / Calcium / Cyclic adenosine monophosphate |
| Disperse Blue 106 Drug Metabolism |  | Metabolic | Disperse Blue 106 |
| Distigmine Action Pathway |  | Drug Action | Choline / Calcium / Magnesium cation / Acetylcholine / Acetic acid / Distigmine |
| Disulfiram Action Pathway |  | Drug Action | Pyridoxal phosphate / Ademetionine / Ascorbic acid / Aspartic acid / Adenosine phosphate / Tyrosine / Glutamic acid / NADH / ATP / Sapropterin / Norepinephrine / Epinephrine / Disulfiram / Ethanol / Dopamine / Levodopa / Calcium / Magnesium cation / Iron / Zinc / 2-(3,4-Dihydroxyphenyl)Acetic Acid / Acetoacetic acid / Methylamine / 1,2-Dihydroxybenzene / Mesoheme / Oxogluric acid / Flavin adenine dinucleotide / Acetic acid / Pyrroloquinoline Quinone / Pyrophosphoric acid / Maleic acid / 4-Hydroxyphenylpyruvic acid / Homogentisic acid |
| Disulfiram Aldehyde Dehydrogenase Inhibitor Action Pathway |  | Drug Action | Adenosine phosphate / NADH / ATP / Disulfiram / Ethanol / Zinc / Mesoheme / Acetic acid / Pyrophosphoric acid |
| Disulfiram Drug Metabolism |  | Metabolic | Disulfiram |
| Ditiocarb zinc Drug Metabolism |  | Metabolic | Ditiocarb zinc |