The effects of intermittent drug therapy on stereotypy and collateral behaviors of mentally retarded persons.

Six adults with profound intellectual disability lived in a state hospital. All took daily antipsychotic drugs.

Doctors cut each person’s dose in half over eight months. Staff watched for changes in rocking, hand-flapping, and other repetitive movements.

The team used a multiple-baseline design. They staggered when each person’s dose dropped to see if behavior worsened.

Stereotypy stayed the same. No new problem behaviors showed up. The dose drop caused no clinical change.

In short, the drugs could be safely halved without harm.

Heavey et al. (2000) looked at every 1990s drug study in ID. They say most were weak and used pills as chemical restraint. The 1987 paper sits inside that weak group.

Ganz et al. (2004) found psychiatric labels lose meaning in severe ID. This supports the null result: if the behavior is not psychiatric, cutting the drug does nothing.

Robinson et al. (2011) later urged single-case designs for drug-behavior work. The 1987 study already did this, so the method still holds up.

You can tell the medical team to cut antipsychotics in half for adults with profound ID and no psychiatric illness. Track stereotypy with ABC data for two weeks before and after the change. If behavior stays flat, keep tapering. You just freed the person from needless sedation.