Dosage with a Pre-Condition - Alprazolam

{
  "resourceType": "MedicationAdministration",
  "id": "medadmin0311",
  "text": {
    "status": "generated",
    "div": "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p><b>Generated Narrative: MedicationAdministration</b><a name=\"medadmin0311\"> </a></p><div style=\"display: inline-block; background-color: #d9e0e7; padding: 6px; margin: 4px; border: 1px solid #8da1b4; border-radius: 5px; line-height: 60%\"><p style=\"margin-bottom: 0px\">Resource MedicationAdministration &quot;medadmin0311&quot; </p></div><p><b>status</b>: completed</p><h3>Medications</h3><table class=\"grid\"><tr><td>-</td><td><b>Reference</b></td></tr><tr><td>*</td><td><a name=\"med0304\"> </a><blockquote><p/><p><a name=\"med0304\"> </a></p><p><b>code</b>: Alprazolam 0.25mg Oral Tablet <span style=\"background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki\"> (<a href=\"http://terminology.hl7.org/3.1.0/CodeSystem-v3-rxNorm.html\">RxNorm</a>#308047)</span></p></blockquote></td></tr></table><p><b>subject</b>: <a href=\"patient-example-a.html\">Patient/pat1: Donald Duck</a> &quot;Donald DUCK&quot;</p><p><b>occurence</b>: 2015-01-15T22:03:00+01:00 --&gt; 2015-01-16T02:03:00+01:00</p><h3>Performers</h3><table class=\"grid\"><tr><td>-</td><td><b>Actor</b></td></tr><tr><td>*</td><td><a href=\"practitioner-example-f007-sh.html\">Practitioner/f007: Patrick Pump</a> &quot;Simone HEPS&quot;</td></tr></table><h3>Reasons</h3><table class=\"grid\"><tr><td>-</td><td><b>Concept</b></td></tr><tr><td>*</td><td>Dysmenorrhea <span style=\"background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki\"> (<a href=\"https://browser.ihtsdotools.org/\">SNOMED CT</a>#266599000)</span></td></tr></table><p><b>request</b>: <a href=\"medicationrequest0305.html\">MedicationRequest/medrx0305</a></p><h3>Dosages</h3><table class=\"grid\"><tr><td>-</td><td><b>Text</b></td><td><b>Route</b></td><td><b>Dose</b></td></tr><tr><td>*</td><td>0.25mg PO every 6-12 hours as needed for menses from Jan 15-20, 2015.  Do not exceed more than 4mg per day</td><td>Oral Route <span style=\"background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki\"> (<a href=\"https://browser.ihtsdotools.org/\">SNOMED CT</a>#26643006)</span></td><td>1 TAB<span style=\"background: LightGoldenRodYellow\"> (Details: http://terminology.hl7.org/CodeSystem/v3-orderableDrugForm code TAB = 'Tablet')</span></td></tr></table></div>"
  },
  "contained": [
    {
      "resourceType": "Medication",
      "id": "med0304",
      "code": {
        "coding": [
          {
            "system": "http://www.nlm.nih.gov/research/umls/rxnorm",
            "code": "308047",
            "display": "Alprazolam 0.25mg Oral Tablet"
          }
        ]
      }
    }
  ],
  "status": "completed",
  "medication": {
    "reference": {
      "reference": "#med0304"
    }
  },
  "subject": {
    "reference": "Patient/pat1",
    "display": "Donald Duck"
  },
  "occurencePeriod": {
    "start": "2015-01-15T22:03:00+01:00",
    "end": "2015-01-16T02:03:00+01:00"
  },
  "performer": [
    {
      "actor": {
        "reference": "Practitioner/f007",
        "display": "Patrick Pump"
      }
    }
  ],
  "reason": [
    {
      "concept": {
        "coding": [
          {
            "system": "http://snomed.info/sct",
            "code": "266599000",
            "display": "Dysmenorrhea"
          }
        ]
      }
    }
  ],
  "request": {
    "reference": "MedicationRequest/medrx0305"
  },
  "dosage": {
    "text": "0.25mg PO every 6-12 hours as needed for menses from Jan 15-20, 2015.  Do not exceed more than 4mg per day",
    "route": {
      "coding": [
        {
          "system": "http://snomed.info/sct",
          "code": "26643006",
          "display": "Oral Route"
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    "dose": {
      "value": 1,
      "unit": "TAB",
      "system": "http://terminology.hl7.org/CodeSystem/v3-orderableDrugForm",
      "code": "TAB"
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