56 • Antidepressants such as paroxetine, fluoxetines, tricyclic antidepressants • Medicines known as beta blockers (used to treat high blood pressure) • Phenothiazines (e. g. used to treat psychosis or to calm down) • Cimetidie, ranitidine (blockers of the acidity of stomach) If you start or stop taking such medicines you may need a different dose of risperidone