Oppositional defiant disorder (ODD), one of the psychiatric disorders frequently encountered in childhood, is a disruptive behaviour disorder involving emotional and behavioural problems. Children with ODD may experience difficulty in controlling anger and are generally disobedient and defiant of other people. Risperidone, an atypical antipsychotic agent is a dopamine and serotonin 2A receptor antagonist, is used in the treatment of disruptive behavioural disorders in which aggressive or other disruptive behaviours predominate (aggressive symptoms, self-harm, anger episodes, sudden mood changes, etc.). We discuss a case of tic disorder developing following risperidone use during treatment of a child diagnosed with ODD.