> ## 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 |


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