Usually, no special immunizations are required or recommended before entry into Denmark.
As mentioned in Insurance, most health insurance services and hospitalization is free of charge in Denmark.
Prescriptions from other countries are not accepted in Denmark, although occasionally a Danish doctor can rewrite them. Also, brand names frequently vary from country to country. However, if you require medication, bring an adequate amount for the semester with you and be sure to bring a statement from the doctor that issued the prescription - both for the authorities upon entry into Denmark and in case you need to go to a doctor in Denmark to get a similiar prescription here.