| Doxepin H1 Antihistamine Neurological Sleep Action Pathway |  | Drug Action | Pyridoxal phosphate / Histidine / Doxepin / Calcium |
| Doxepin H1 Antihistamine Smooth Muscle Relaxation Action Pathway |  | Drug Action | Doxepin / Calcium / Magnesium cation |
| Doxepin H1-Antihistamine Action |  | Drug Action | Doxepin / Calcium |
| Doxepin H1-Antihistamine Blood Vessel Constriction Action Pathway |  | Drug Action | Arginine / Citrulline / Sapropterin / Nitric Oxide / Doxepin / Calcium / Magnesium cation / Mesoheme / Flavin adenine dinucleotide / Flavin mononucleotide |
| Doxepin H1-Antihistamine Immune Response Action Pathway |  | Drug Action | Doxepin / Calcium |
| Doxepin Metabolism Pathway |  | Drug Metabolism | NADH / Doxepin / Mesoheme / Formaldehyde |
| Doxepin Norepinephrine Reuptake Inhibitor Action Pathway (New) |  | Drug Action | Pyridoxal phosphate / Ascorbic acid / Tyrosine / Tryptophan / Sapropterin / Norepinephrine / Dopamine / Doxepin / Levodopa / Calcium / Iron / Oxitriptan / Pyrroloquinoline Quinone |
| Doxorubicin Metabolism Pathway |  | Drug Metabolism | NADH / ATP / Sapropterin / Doxorubicin / Mesoheme / Flavin adenine dinucleotide / Flavin mononucleotide |
| Doxorubicin Topoisomerase Inhibitor Action Pathway |  | Drug Action | Doxorubicin / Magnesium cation |
| Doxycycline Action Pathway |  | Drug Action | Doxycycline |
| Doxycycline Predicted Metabolism Pathway |  | Metabolic | Doxycycline / Mesoheme |
| Doxylamine H1 Antihistamine Neurological Sleep Action Pathway |  | Drug Action | Pyridoxal phosphate / Histidine / Doxylamine / Calcium |
| Doxylamine H1 Antihistamine Smooth Muscle Relaxation Action Pathway |  | Drug Action | Doxylamine / Calcium / Magnesium cation |
| Doxylamine H1-Antihistamine Blood Vessel Constriction Action Pathway |  | Drug Action | Arginine / Citrulline / Sapropterin / Doxylamine / Nitric Oxide / Calcium / Magnesium cation / Mesoheme / Flavin adenine dinucleotide / Flavin mononucleotide |
| Doxylamine H1-Antihistamine Immune Response Action Pathway |  | Drug Action | Doxylamine / Calcium |
| Drometrizole trisiloxane Drug Metabolism |  | Metabolic | Drometrizole trisiloxane |
| Dronedarone Multiple Ion Channel Cardiac Muscle Relaxation Action Pathway |  | Drug Action | ATP / Epinephrine / Potassium cation / Calcium / Dronedarone |
| Droperidol Mechanism of Action Action Pathway |  | Drug Action | Pyridoxal phosphate / Tyrosine / Sapropterin / Droperidol / Dopamine / Levodopa / Calcium / Iron |
| Droperidol Predicted Metabolism Pathway |  | Metabolic | Droperidol / Mesoheme |
| Drospirenone Action Pathway |  | Drug Action | NADH / ATP / Progesterone / Testosterone / Estrone / Potassium cation / Calcium / Magnesium cation / Drospirenone / Androstenedione / Cyclic adenosine monophosphate / Mesoheme / Pyrophosphoric acid / Cholesterol / 2-Hydroxyestradiol |
| Drotaverine Action Pathway |  | Drug Action | Adenosine phosphate / Calcium / Magnesium cation / Cyclic adenosine monophosphate / Acetylcholine / Drotaverine |
| Droxidopa A1-Adrenergic Vasoconstriction Action Pathway |  | Drug Action | ATP / Norepinephrine / Calcium / Magnesium cation |
| Droxidopa B1-Adrenergic Cardiac Muscle Contraction Action Pathway |  | Drug Action | Pyridoxal phosphate / ATP / Norepinephrine / Calcium / Droxidopa |
| Droxidopa B2-Adrenergic Artery Dilation Action Pathway |  | Drug Action | ATP / Norepinephrine / Potassium cation / Calcium / Magnesium cation / Cyclic adenosine monophosphate |
| Duloxetine (SNRI) - Norepinephrine Reuptake Inhibiton |  | Drug Action | Pyridoxal phosphate / Ascorbic acid / Tyrosine / Norepinephrine / Duloxetine / Dopamine / Levodopa / Calcium / Iron / Pyrroloquinoline Quinone |