A new NIH study looks, for the first time, at antipsychotic prescriptions patterns in America.
Researchers discovered boys are more likely than girls to receive a prescription for antipsychotic medication regardless of age. Approximately 1.5 percent of boys ages 10-18 received an antipsychotic prescription in 2010, although the percentage falls by nearly half after age 19.
Antipsychotic were prescribed most often for attention deficit hyperactivity disorder (ADHD) among youth ages one to 18. Depression was the most common diagnosis among young adults ages 19-24 for receiving antipsychotics.
Despite concerns over the rising use of antipsychotic drugs to treat young people, little has been known about trends and usage patterns in the United States before this latest research.
Mark Olfson, M.D., M.P.H., and colleagues Marissa King, Ph.D., and Michael Schoenbaum, Ph.D., report their findings in JAMA Psychiatry.
“No prior study has had the data to look at age patterns in antipsychotic use among children the way we do here,” said co-author Michael Schoenbaum, Ph.D., senior advisor for mental health services, epidemiology and economics at NIMH.
“What’s especially important is the finding that around 1.5 percent of boys aged 10-18 are on antipsychotics, and then this rate abruptly falls by half, as adolescents become young adults.”
“Antipsychotics should be prescribed with care,” says Schoenbaum. “They can adversely affect both physical and neurological function and some of their adverse effects can persist even after the medication is stopped.”
However, the research team found that the medication use patterns do not match the illness patterns. The mismatch means that many antipsychotic prescriptions for young people may be for off-label purposes, that is, for uses not approved by FDA.
For example, maladaptive aggression is common in ADHD, and clinical trial data suggest that at least one antipsychotic, risperidone, when used with stimulants, can help reduce aggression in ADHD.
To date, FDA has not approved the use of any antipsychotic for ADHD, making its use for this diagnosis off-label.
In the current study, the combination of peak use of antipsychotics in adolescent boys and the diagnoses associated with prescriptions (often ADHD) suggest that these medications are being used to treat developmentally limited impulsivity and aggression rather than psychosis.
Mark Olfson and colleagues worked with the IMS LifeLink LRx database, which includes 63 percent of outpatient prescriptions filled in the U.S. The team looked at prescription data for 2006-2010 and found antipsychotic use increased with age in both boys and girls.
They found antipsychotic use beginning at 0.11 percent in 2010 for ages one to six years, increasing to 0.80 percent for ages seven to 12 years and increasing again to 1.19 percent for youth ages 13-18 years before dropping substantially to 0.84 percent for ages 19-24.
In children ages one to six, boys were more than twice as likely as girls to receive an antipsychotic prescription (0.16 vs. 0.06 percent in 2010). This pattern held true for boys and girls ages seven to 12 (1.20 vs. 0.44 percent in 2010) before narrowing for the 13-18 age group (1.42 vs. 0.95 percent) and finally becoming more comparable for young men and women ages 19 to 24 (0.88 to 0.81 percent in 2010).
Among young people treated with antipsychotics in 2010, the youngest children, ages one to six, were the least likely to receive the prescription from a psychiatrist (57.9 vs. 71.9, 77.9, and 70.4 percent for the other three age groups). This is a source of concern, as practice guidelines caution practitioners on the use of antipsychotic medications for young children in particular.
Among young people receiving antipsychotic prescriptions, fewer than half had any medical visit that included a mental disorder diagnosis. That may be in part due to stigma about mental illness, or because primary care providers are concerned about reimbursement for treatment related to such diagnoses.
“In addition to having a new look at antipsychotic use among youth, one positive finding coming from this study is that around 75 percent of these kids have at least some contact with a psychiatrist,” said NIMH Director Thomas Insel, M.D.