## On this page

Describe the undesirable effects of the medicinal product.

## Elements

| Name | Required | Type | Description |
| --- | --- | --- | --- |
| subject |  | Reference< [MedicinalProduct](/content/docs/api/fhir/resources/medicinalproduct/index.html) \| [Medication](/content/docs/api/fhir/resources/medication/index.html) >\[\] | The medication for which this is an indication<br>Details<br>The medication for which this is an indication. |
| symptomConditionEffect |  | [CodeableConcept](/content/docs/api/fhir/datatypes/codeableconcept/index.html) | The symptom, condition or undesirable effect<br>Details<br>The symptom, condition or undesirable effect. |
| classification |  | [CodeableConcept](/content/docs/api/fhir/datatypes/codeableconcept/index.html) | Classification of the effect<br>Details<br>Classification of the effect. |
| frequencyOfOccurrence |  | [CodeableConcept](/content/docs/api/fhir/datatypes/codeableconcept/index.html) | The frequency of occurrence of the effect<br>Details<br>The frequency of occurrence of the effect. |
| population |  | [Population](/content/docs/api/fhir/datatypes/population/index.html)\[\] | The population group to which this applies<br>Details<br>The population group to which this applies. |

## Search Parameters

| Name | Type | Description | Expression |
| --- | --- | --- | --- |
| subject | reference | The medication for which this is an undesirable effect | MedicinalProductUndesirableEffect.subject |

## Inherited Elements

| Name | Required | Type | Description |
| --- | --- | --- | --- |
| id |  | string | Logical id of this artifact<br>Details<br>The logical id of the resource, as used in the URL for the resource. Once assigned, this value never changes.<br>The only time that a resource does not have an id is when it is being submitted to the server using a create operation. |
| meta |  | [Meta](/content/docs/api/fhir/datatypes/meta/index.html) | Metadata about the resource<br>Details<br>The metadata about the resource. This is content that is maintained by the infrastructure. Changes to the content might not always be associated with version changes to the resource. |
| implicitRules |  | uri | A set of rules under which this content was created<br>Details<br>A reference to a set of rules that were followed when the resource was constructed, and which must be understood when processing the content. |
| language |  | code | Language of the resource content<br>Details<br>The base language in which the resource is written. |
| text |  | [Narrative](/content/docs/api/fhir/datatypes/narrative/index.html) | Text summary of the resource, for human interpretation<br>Details<br>A human-readable narrative that contains a summary of the resource and can be used to represent the content of the resource to a human. |
| contained |  | Resource\[\] | Contained, inline Resources<br>Details<br>These resources do not have an independent existence apart from the resource that contains them. |
| extension |  | [Extension](/content/docs/api/fhir/datatypes/extension/index.html)\[\] | Additional content defined by implementations<br>Details<br>May be used to represent additional information that is not part of the basic definition of the resource. |
| modifierExtension |  | [Extension](/content/docs/api/fhir/datatypes/extension/index.html)\[\] | Extensions that cannot be ignored<br>Details<br>May be used to represent additional information that is not part of the basic definition of the resource and that modifies the understanding of the element that contains it. |

A potential negative outcome from the use of a medicinal product. This is part of the definitional information about a product and is not related to any particular actual use of a medication. See also [AdverseEvent](/content/docs/api/fhir/resources/adverseevent/index.html), which is for actual events (or near misses), and [AllergyIntolerance](/content/docs/api/fhir/resources/allergyintolerance/index.html).