| Hypoacetylaspartia |  | Disease | Pyridoxal phosphate / Arginine / Aspartic acid / L-Glutamine / Adenosine phosphate / Glutamic acid / Citrulline / ATP / Asparagine / Magnesium cation / Zinc / D-Aspartic Acid / beta-Alanine / Flavin adenine dinucleotide / Acetic acid / Pyrophosphoric acid / N-Carbamoylaspartic acid / Maleic acid |
| Hypophosphatasia |  | Disease | Pyridoxal phosphate / Pyridoxal / Pyridoxine / Magnesium cation / Zinc / Pyridoxamine-5'-Phosphate / Pyridoxine phosphate / Flavin adenine dinucleotide / Flavin mononucleotide |
| Ibandronate Action Pathway |  | Drug action | Cholecalciferol / ATP / Ibandronate / Magnesium cation / Iron / Dimethylallyl Diphosphate / Formic acid / Geranyl Diphosphate / Mesoheme / Flavin adenine dinucleotide / Palmitic Acid / Pyrophosphoric acid / Cholesterol / ISOPENTENYL PYROPHOSPHATE / Farnesyl diphosphate |
| Ibuprofen Action Pathway |  | Drug action | Glutamic acid / Glutathione / Dinoprostone / Ibuprofen / Calcium / Magnesium cation / Zinc / Prostaglandin D2 / Mesoheme / Uridine-5'-Diphosphate / Prostaglandin G2 / Arachidonic Acid |
| Ibuprofen Metabolism Pathway |  | Drug metabolism | Ibuprofen / Mesoheme / Uridine-5'-Diphosphate |
| Ibutilide Action Pathway |  | Drug action | ATP / Ibutilide / Potassium cation / Calcium / Magnesium cation |
| Ifosfamide Action Pathway |  | Drug action | NADH / Ifosfamide / Mesoheme / Acrylic Acid |
| Ifosfamide Metabolism Pathway |  | Drug metabolism | NADH / Ifosfamide / Mesoheme / Acrylic Acid |
| Imatinib Inhibition of BCR-ABL |  | Drug action | Imatinib |
| Iminoglycinuria |  | Disease | Cysteine / Potassium cation / Urea |
| Imipramine Action Pathway |  | Drug action | NADH / ATP / Norepinephrine / Imipramine / Dopamine / Desipramine / Potassium cation / Calcium / Mesoheme / Formaldehyde |
| Imipramine Metabolism Pathway |  | Drug metabolism | NADH / Imipramine / Desipramine / Mesoheme / Formaldehyde |
| Indapamide Action Pathway |  | Drug action | Cysteine / Indapamide / Potassium cation / Urea |
| Indomethacin Action Pathway |  | Drug action | Glutamic acid / Glutathione / Indomethacin / Dinoprostone / Calcium / Magnesium cation / Zinc / Prostaglandin D2 / Mesoheme / Prostaglandin G2 / Arachidonic Acid |
| Inositol Metabolism |  | Metabolic | ATP / Calcium / Magnesium cation / Iron / 1D-myo-inositol 1,3,4-trisphosphate / Pyrophosphoric acid / Inositol |
| Inositol Phosphate Metabolism |  | Metabolic | ATP / Magnesium cation / 1D-myo-inositol 1,3,4-trisphosphate / Inositol |
| Insulin Signalling |  | Signaling | Magnesium cation / Zinc |
| Intracellular Signalling Through Adenosine Receptor A2a and Adenosine |  | Signaling | ATP / Adenosine / Magnesium cation / Zinc / Cyclic adenosine monophosphate / Pyrophosphoric acid |
| Intracellular Signalling Through Adenosine Receptor A2b and Adenosine |  | Signaling | ATP / Adenosine / Magnesium cation / Zinc / Cyclic adenosine monophosphate / Pyrophosphoric acid |
| Intracellular Signalling Through FSH Receptor and Follicle Stimulating Hormone |  | Signaling | ATP / Magnesium cation / Cyclic adenosine monophosphate / Pyrophosphoric acid |
| Intracellular Signalling Through Histamine H2 Receptor and Histamine |  | Signaling | ATP / Magnesium cation / Cyclic adenosine monophosphate / Pyrophosphoric acid |
| Intracellular Signalling Through LHCGR Receptor and Luteinizing Hormone/Choriogonadotropin |  | Signaling | ATP / Magnesium cation / Cyclic adenosine monophosphate / Pyrophosphoric acid |
| Intracellular Signalling Through PGD2 receptor and Prostaglandin D2 |  | Signaling | ATP / Magnesium cation / Prostaglandin D2 / Cyclic adenosine monophosphate / Pyrophosphoric acid |
| Intracellular Signalling Through Prostacyclin Receptor and Prostacyclin |  | Signaling | ATP / Calcium / Magnesium cation / Cyclic adenosine monophosphate / Pyrophosphoric acid |
| Irbesartan Action Pathway |  | Drug action | Irbesartan / Zinc |