PREFIX sdtm: <http://www.sdtm.org/vocabulary#>
PREFIX spl: <http://www.hl7.org/v3ballot/xml/infrastructure/vocabulary/vocabulary#>

SELECT ?patient ?dob ?sex ?takes ?indicDate # ?indicEnd ?contra
 WHERE {
  ?patient a sdtm:Patient ;
          sdtm:middleName ?middleName ;
          sdtm:dateTimeOfBirth ?dob ;
          sdtm:sex ?sex .

  [	  sdtm:subject ?patient ;
	  sdtm:standardizedMedicationName ?takes ;

	  # nothing by ingredient in sdtm/caBIG/...
          sdtm:startDateTimeOfMedication ?indicDate ;
	  # ; sdtm:endDateTimeOfMedication ?indicEnd
	  spl:activeIngredient [ spl:classCode 6809 ]
  ] .
  OPTIONAL {
  [	  sdtm:subject ?patient ;
	  sdtm:standardizedMedicationName ?contra ;
 	  sdtm:startDateTimeOfMedication ?contraDate ;
	  # ; sdtm:endDateTimeOfMedication   ?contraEnd
	  spl:activeIngredient [ spl:classCode 11289 ]
  ] .
  }
  FILTER (!BOUND(?contra))
} LIMIT 30