Shared decision-making denotes a structured process that encourages full participation by patient and provider in making complex medical decisions. Although the main justification for shared decision-making is ethical, several randomized controlled trials support its effectiveness in improving the quality of decisions, but robust evidence in objective health outcomes is needed.

Analyze the degree of antipsychotic politherapy or monotherapy in patients discharged after their inclusion in the study and randomized to Share Decision-Making or Treat as Usual. Present preliminary conclusions after 20 months of follow-up.

Randomized controlled trial, prospective, two parallel groups, not masked, comparing two interventions (shared decision making and treatment as usual). Previous antipsychotic treatment is collected by interviewing patient and family and as included in digital history and health card, discharge and reviews conducted at 3, 6 and 12 months.

Interim analysis shows there are no differences between groups (SDM and TaU) before intervention, we note the following results:

• – the degree of antipsychotic politherapy prior to admission for the entire sample decreased at discharge;

• – at discharge, there is a difference between SDM and TaU. Antipsychotic polytherapy in SDM decreases in a higher level.

The authors have not supplied their declaration of competing interest.