Money for Medication: A randomized controlled study on the effectiveness of financial incentives to improve medication adherence in patients with a psychotic disorder and co-morbid substance abuse.

Money for Medication (M4M) is a randomized controlled study on the effectivenes of financial incentives in improving adherence with antipsychotic depot medication in patients with psychotic disorders and co-morbid substance abuse.

Providing M4M will increase patients acceptance of their prescribed antipsychotic depot medication.

1. Baseline (Month 0);

2. End of intervention (Month 12);

3. Follow-up (Month 18).

Patients assigned to the intervention group (M4M) will receive treatment as usual, plus a financial incentive for each time they accept their prescribed depot of antipsychotic medication. All patients in the intervention group (M4M) will receive an average maximum of 30 euro per month. The amount of money they will receive is dependent upon the frequency of the depot. For example, a patient who receives a two-weekly depot will receive 15 euro per accepted depot. A patient who receives a three-weekly depot will receive 22.50 euro for each accepted depot etcetera.