| 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 |
| Iobenguane Drug Metabolism |  | Metabolic | Iobenguane |
| Iocetamic acid Predicted Metabolism Pathway |  | Metabolic | Mesoheme / Iocetamic acid |
| Iodipamide Metabolism |  | Metabolic | Iodipamide |
| Iodixanol Predicted Metabolism Pathway |  | Metabolic | Iodixanol / Mesoheme |
| Iodohippurate sodium I-123 Drug Metabolism |  | Metabolic | Iodohippurate sodium I-123 |
| Iodohippurate sodium I-131 Drug Metabolism |  | Metabolic | Iodohippurate sodium I-131 |
| Ioflupane I-123 Predicted Metabolism Pathway |  | Metabolic | Mesoheme / Ioflupane I-123 |
| Iopamidol Predicted Metabolism Pathway |  | Metabolic | Mesoheme / Iopamidol |
| Iophendylate Predicted Metabolism Pathway |  | Metabolic | Iophendylate / Mesoheme |
| Iopromide Predicted Metabolism Pathway |  | Metabolic | Midodrine / Mesoheme / Iopromide |
| Ioversol Metabolism |  | Metabolic | Ioversol |
| Ioxilan Predicted Metabolism Pathway |  | Metabolic | Mesoheme / Ioxilan |
| Ipratropium bromide Drug Metabolism Pathway |  | Metabolic | Ipratropium |
| Ipratropium M3 Bronchodilation Action Pathway |  | Drug Action | Ipratropium / Calcium / Magnesium cation |
| Ipratropium Metabolism |  | Metabolic | Ipratropium / Mesoheme |
| Irbesartan Action Pathway |  | Drug Action | Irbesartan / Potassium cation / Zinc |
| Irbesartan Angiotensin blocker Action Pathway |  | Drug Action | Glutamic acid / Irbesartan / Zinc |
| Irbesartan Predicted Metabolism Pathway |  | Metabolic | Irbesartan / Mesoheme |
| Irinotecan Action Pathway |  | Drug Action | ATP / Irinotecan / Mesoheme / Uridine-5'-Diphosphate / SN-38 |
| Irinotecan Metabolism |  | Metabolic | Irinotecan / Mesoheme / Glutaral / Uridine-5'-Diphosphate / SN-38 |