This class is used to contain the collective information used to describe how the medication should be taken by the Patient. This information is used by at least two other classes and will likely be used elsewhere. In the past much of this information would have been conveyed in free-form text called a "sig", while the other fields are used to contain those components of the sig in separate fields. "Indicates how the medication is/was taken or should be taken by the patient." - HL7 FHIR, Dosage "Describes the medication dosage information details e.g. dose, rate, site, route, etc." - HL7 FHIR, MedicationAdministration.dosage