Request for a medication that is intended to be given as a single, once only dose

{
  "resourceType" : "MedicationRequest",
  "id" : "medrx0332",
  "contained" : [{
    "resourceType" : "Medication",
    "id" : "med03499",
    "code" : {
      "coding" : [{
        "system" : "http://snomed.info/sct",
        "code" : "375860009",
        "display" : "Ceftriaxone (as ceftriaxone sodium) 500 mg powder for solution for injection vial"
      }]
    }
  }],
  "identifier" : [{
    "use" : "official",
    "system" : "http://www.bmc.nl/portal/prescriptions",
    "value" : "12345689"
  }],
  "basedOn" : [{
    "reference" : "CarePlan/gpvisit"
  }],
  "groupIdentifier" : {
    "use" : "official",
    "system" : "http://www.bmc.nl/portal/prescriptions",
    "value" : "983939393"
  },
  "status" : "active",
  "intent" : "order",
  "medication" : {
    "reference" : {
      "reference" : "#med03499"
    }
  },
  "subject" : {
    "reference" : "Patient/pat1",
    "display" : "Donald Duck"
  },
  "encounter" : {
    "reference" : "Encounter/f001",
    "display" : "encounter who leads to this prescription"
  },
  "authoredOn" : "2015-01-15",
  "requester" : {
    "reference" : "Practitioner/f007",
    "display" : "Patrick Pump"
  },
  "dosageInstruction" : [{
    "sequence" : 1,
    "text" : "Administer 500mg IM as a single dose",
    "timing" : {
      "repeat" : {
        "count" : 1
      }
    },
    "route" : {
      "coding" : [{
        "system" : "http://snomed.info/sct",
        "code" : "255559005",
        "display" : "Intramuscular (qualifier value)"
      }]
    },
    "doseAndRate" : [{
      "type" : {
        "coding" : [{
          "system" : "http://terminology.hl7.org/CodeSystem/dose-rate-type",
          "code" : "ordered",
          "display" : "Ordered"
        }]
      },
      "doseQuantity" : {
        "value" : 500,
        "unit" : "mg",
        "system" : "http://unitsofmeasure.org",
        "code" : "mg"
      }
    }]
  }]
}