Medical cannabis falls under the Opium Act. You can only bring these medicines with you to the Netherlands if you have an official medical certificate. You may also need to get this certificate legalized.
Check with the local authorities in your country of departure what the rules are for taking medicines with you: https://www.belastingdienst.nl/wps/wcm/connect/bldcontenten/belastingdienst/individuals/abroad_and_customs/restricted_prohibited_import_export/medicines1/medicines
Bring enough medication for the trip, along with letter from the Doctor and dispensing labels on original medicine packaging