Secondary outcome measures are ( @ ) change in severity of behavioural symptoms , as measured by the NPI-Q at @ months ( to ensure antipsychotic reduction has not lead to worsening behavioural symptoms ) , and ( @ ) proportion of people with HD who have had a reduction in antipsychotic dosage at @ months for each strategy , compared to @ months prior to enrolment ( to capture the possibility that both arms reduced antipsychotic use ) .