> ## Documentation Index
> Fetch the complete documentation index at: https://docs.metriport.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Dosage

> Base StructureDefinition for Dosage Type: Indicates how the medication is/was taken or should be taken by the patient.

## Properties

| Name                     | Required | Type                                                                                                                                        | Description                                                                                     |
| ------------------------ | -------- | ------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------- |
| id                       | No       | string                                                                                                                                      | Unique id for inter-element referencing                                                         |
| extension                | No       | [Extension](/medical-api/fhir/data-types/extension)\[]                                                                                      | Additional content defined by implementations                                                   |
| modifierExtension        | No       | [Extension](/medical-api/fhir/data-types/extension)\[]                                                                                      | Extensions that cannot be ignored even if unrecognized                                          |
| sequence                 | No       | integer                                                                                                                                     | The order of the dosage instructions                                                            |
| text                     | No       | string                                                                                                                                      | Free text dosage instructions e.g. SIG                                                          |
| additionalInstruction    | No       | [CodeableConcept](/medical-api/fhir/data-types/codeableconcept)\[]                                                                          | Supplemental instruction or warnings to the patient - e.g. "with meals", "may cause drowsiness" |
| patientInstruction       | No       | string                                                                                                                                      | Patient or consumer oriented instructions                                                       |
| timing                   | No       | [Timing](/medical-api/fhir/data-types/timing)                                                                                               | When medication should be administered                                                          |
| asNeeded\[x]             | No       | boolean, [CodeableConcept](/medical-api/fhir/data-types/codeableconcept)                                                                    | Take "as needed" (for x)                                                                        |
| site                     | No       | [CodeableConcept](/medical-api/fhir/data-types/codeableconcept)                                                                             | Body site to administer to                                                                      |
| route                    | No       | [CodeableConcept](/medical-api/fhir/data-types/codeableconcept)                                                                             | How drug should enter body                                                                      |
| method                   | No       | [CodeableConcept](/medical-api/fhir/data-types/codeableconcept)                                                                             | Technique for administering medication                                                          |
| doseAndRate              | No       | Element\[]                                                                                                                                  | Amount of medication administered                                                               |
| - id                     | No       | string                                                                                                                                      | Unique id for inter-element referencing                                                         |
| - extension              | No       | [Extension](/medical-api/fhir/data-types/extension)\[]                                                                                      | Additional content defined by implementations                                                   |
| - type                   | No       | [CodeableConcept](/medical-api/fhir/data-types/codeableconcept)                                                                             | The kind of dose or rate specified                                                              |
| - dose\[x]               | No       | [Range](/medical-api/fhir/data-types/range), [Quantity](/medical-api/fhir/data-types/quantity)                                              | Amount of medication per dose                                                                   |
| - rate\[x]               | No       | [Ratio](/medical-api/fhir/data-types/ratio), [Range](/medical-api/fhir/data-types/range), [Quantity](/medical-api/fhir/data-types/quantity) | Amount of medication per unit of time                                                           |
| maxDosePerPeriod         | No       | [Ratio](/medical-api/fhir/data-types/ratio)                                                                                                 | Upper limit on medication per unit of time                                                      |
| maxDosePerAdministration | No       | [Quantity](/medical-api/fhir/data-types/quantity)                                                                                           | Upper limit on medication per administration                                                    |
| maxDosePerLifetime       | No       | [Quantity](/medical-api/fhir/data-types/quantity)                                                                                           | Upper limit on medication per lifetime of the patient                                           |