Når efavirenz gives sammen med ritonavir i lav dosis, bør muligheden for stigning i incidensen af efavirenz - associerede bivirkninger overvejes på grund af eventuel farmakodynamisk interaktion.
When using efavirenz with low-dose ritonavir, the possibility of an increase in the incidence of efavirenz-associated adverse events should be considered, due to possible pharmacodynamic interaction.