Dyskinesier (27%), kvalme (11%), diarré (8%), abdominal smerte (7%) og mundtørhed (4, 2%) blev rapporteret signifikant hyppigere med entakapon end placebo i poolede data fra kliniske studier, hvor 406 patienter har fået den aktive medicin, og 296 patienter har fået placebo.
Dyskinesias (27%), nausea (11%), diarrhoea (8%), abdominal pain (7%) and dry mouth (4.2%) were reported significantly more often with entacapone than with placebo in pooled data from clinical studies involving 406 patients taking the medicinal product and 296 patients taking placebo.