| Source Element | Usage | Target |
| MedicinalProductInteraction | UseExtension | http://hl7.org/fhir/4.0/StructureDefinition/extension-MedicinalProductInteraction |
| MedicinalProductInteraction.id | UseExtensionFromAncestor | - |
| MedicinalProductInteraction.meta | UseExtensionFromAncestor | - |
| MedicinalProductInteraction.implicitRules | UseExtensionFromAncestor | - |
| MedicinalProductInteraction.language | UseExtensionFromAncestor | - |
| MedicinalProductInteraction.text | UseExtensionFromAncestor | - |
| MedicinalProductInteraction.contained | UseExtensionFromAncestor | - |
| MedicinalProductInteraction.extension | UseExtensionFromAncestor | - |
| MedicinalProductInteraction.modifierExtension | UseExtensionFromAncestor | - |
| MedicinalProductInteraction.subject | UseExtensionFromAncestor | - |
| MedicinalProductInteraction.description | UseExtensionFromAncestor | - |
| MedicinalProductInteraction.interactant | UseExtensionFromAncestor | - |
| MedicinalProductInteraction.interactant.id | UseExtensionFromAncestor | - |
| MedicinalProductInteraction.interactant.extension | UseExtensionFromAncestor | - |
| MedicinalProductInteraction.interactant.modifierExtension | UseExtensionFromAncestor | - |
| MedicinalProductInteraction.interactant.item[x] | UseExtensionFromAncestor | - |
| MedicinalProductInteraction.type | UseExtensionFromAncestor | - |
| MedicinalProductInteraction.effect | UseExtensionFromAncestor | - |
| MedicinalProductInteraction.incidence | UseExtensionFromAncestor | - |
| MedicinalProductInteraction.management | UseExtensionFromAncestor | - |