Difficult recruitment, despite several interventions.

During hospitalization, medication administration errors (MAEs) occur daily in health care and can lead to serious harm. Improvement of medication safety is a major concern to policymakers and health care workers. Inpatient self-administration of medication (SAM) during hospital admission could be a way to reduce MAEs. Therefore the aim of this study is to determine the effect of inpatient self-administration of medication on the number of medication administration errors during hospitalization.

Objective: the main objective of this study is to determine the effect of inpatient self-administration of medication on the number of medication administration errors during hospitalization. The secondary objectives of this study are to determine:

1. The effect of inpatient self-administration of medication on the severity of medication administration errors during hospitalization
2. The effect of inpatient self-administration on medication adherence after hospitalization
3. The effect of inpatient self-administration of medication on patient satisfaction during hospitalization
4. The effect of inpatient self-administration of medication on staff satisfaction during hospitalization

Study design: multicentre prospective quasi-experimental study with a pre-post design

Study population: hospitalized ≥ 16 years old patients

Intervention: the implementation of self-administration of medication by hospitalized patients. SAM will be compared to standard care.

Main study parameters: The primary outcome measure of the study is the proportion of medication administrations with one or more medication administration errors (MAEs). Secondary outcome measures will be: severity of MAEs, medication adherence after hospitalization, patient satisfaction during hospitalization, and staff satisfaction. For all outcome measures the effect of SAM will be compared to standard care.

Nature and extent of the burden and risks associated with participation, benefit and group relatedness: all subjects have to fulfil two questionnaires, one during hospitalization and one approximately three months after leaving the studied ward, e.g. hospital discharge or transfer. The subjects that are included in de post study period have to self-administrate medication that's suitable for SAM. The risk of SAM during hospitalization is estimated as the risk patients are at home when using medication. The burden of SAM is classified as low because results of a recent questionnaire shows that admitted patients have the urge to act in SAM schemes.

Inclusion Criteria:

• All patients (≥ 16 years old) admitted to the ward who use medication or will be using medication at home after hospital discharge and are able to administer (part of) this medication themselves

Exclusion Criteria:

• Not providing informed consent
• The use of a medication box without original medication boxes
• The use of medication pre-packaged by automated dispensing system
• The need of homecare support to administer medication
• The need of an informal caretaker to help with medication administration
• Admitted from a nursing home and medication is under supervision of the staff
• Not understanding the Dutch language, written or spoken
• The subject is not capable of managing SAM (due to mental or physical state)

The subject, staff and investigators are aware of which method of medication administration the patient is given, SAM or standard care. Only the data analysis is blinded by anonymizing and coding all data. Furthermore, an independent person will perform the data analyses.