It's actually laid out here:
International Student Admissions
In accordance with a Recommendation of the Swiss University Conference of 12 October 2006, some categories of international students (i.e. foreign nationals) hold the same status as Swiss nationals applying to medical school:
1. The following persons applying for admission to medical school receive equal treatment to Swiss nationals:
a) Citizens of the Principality of Liechenstein;
b) Foreign nationals domiciled in Switzerland or Liechenstein;
c) Foreign nationals domiciled in Switzerland whose parents are domiciled in Switzerland;
d) Foreign nationals domiciled in Switzerland who are married to a Swiss citizen, or whose spouse has been domiciled in Switzerland for a minimum of five years, or who has held a Swiss work permit for a minimum of five years;
e) Foreign nationals domiciled in Switzerland who have held a Swiss work permit for a minimum of five years, or foreign nationals domiciled in Switzerland whose parents have held a Swiss work permit for a minimum of five years;
f) Foreign nationals domiciled in Switzerland who hold either a federal, cantonal, or a federally recognised academic baccalaureate (Matura) (in accordance with the Federal Academic Baccalaureate Recognition Ordinance of 15 February 1995 and the Federal Academic Baccalaureate Recognition Regulations of 16 January 1995), or who have completed a Federal Vocational Baccalaureate as well as passed their supplementary examinations (in accordance with the Vocational Baccalaureate Recognition Ordinance for University Admissions of 19 December 2003);
g) Children domiciled in Switzerland whose parents are domiciled in Switzerland and who are citizens of a member state of the European Union (EU), provided they have not reached the age of 21 or who are granted child benefit (in accordance with the EU-Swiss Agreement on the Free Movement of Persons, Appendix 1, Art. 3 §6);
h) Children whose parents hold diplomatic status in Switzerland;
i) Recognised refugees resident in Switzerland.
http://www.swissuniversities.ch/en/s...und-anwaerter/