Cambodia Public Health there, but unfortunately is not reliable because it does not come close to the standards. However there are very good private hospitals with many insurance companies, which can also be considered in private as not overly expensive.
Local doctors are able to treat all tropical diseases, from malaria to intestinal infections, with both drugs with natural medicines. In general can be found in pharmacies all products purchased in the West. However, if you are aware of suffering from certain diseases, in order to avoid having to look at what pharmacy to find a specific medication, it is recommended procurselo before departure.
As for protection from mosquitoes, in any pharmacy or supermarket can be purchased effective repellent for tropical insects.