Misuse and abuse
Misuse and diversion of stimulants is common (e.g. 26% diverted MPH in the past month; 14% of 12th graders divert DA), often undetected, and potentially dangerous. And the problem is not limited to just the kids. Sixteen percent of parents reported diversion of stimulant medication to another household member, mainly to themselves. Stimulant overdose can occur, especially taken parenterally, and presents with dilated pupils, tremor, agitation, hyperreflexia, combative behavior, confusion, hallucinations, delirium, anxiety, paranoia, movement disorders, and/or seizures. Fortunately, overdose of prescribed stimulants is rarely fatal if medically managed, but recent “fake” Adderall (not from pharmacies) has been circulating. These fake drugs may contain lethal amounts of fentanyl or methamphetamine. Point out to families that a peer-provided stimulant not prescribed for them may have underlying medical or psychiatric issues that increase adverse events. Selling stimulants can have serious legal implications, with punishments ranging from fines to incarceration. A record of arrest during adolescence increases the likelihood of high school dropout, lack of 4-year college education, and later employment barriers. Besides these serious outcomes, it is useful to remind patients that if they deviate from your recommended dosing that you, and others, will not prescribe for them in the future the medication that has been supporting their successful functioning.
You can be fooled about being able to tell if your patients are misusing or diverting the stimulants you prescribe. Most (59%) physicians suspect that more than one of their patients with ADHD has diverted or feigned symptoms (66%) to get a prescription. Women were less likely to suspect their patients than are men, though, so be vigilant! Child psychiatrists had the highest suspicion with their greater proportion of patients with ADHD plus conduct or substance use disorder, who account for 83% of misusers/diverters. We can use education about misuse, pill counts, contracts on dosing, or switching to long-acting or nonstimulants to curb this.
Additional concerns
With more ADHD diagnosis and stimulants used for many years should we worry about longer-term issues? There have been reports in rodent models and a few children of chromosomal changes with stimulant exposure, but reviewers do not interpret these as an individual cancer risk. Record review of patients who received stimulants showed lower numbers of cancer than expected. Nor is there evidence of reproductive effects of stimulants, although use during pregnancy is not cleared.
Stimulants carry a boxed warning as having high potential for abuse and psychological or physical dependence, which is unsurprising given their effects on brain reward pathways. However, neither past nor present use of stimulants for ADHD has been associated with greater substance use long term.
To top off these issues, recent shortages of stimulants complicate ADHD management. Most states require electronic prescribing, US rules only allowing one transfer of such e-prescriptions. With many pharmacies refusing to tell families about availability, we must make multiple calls to locate a source. Pharmacists could help us by looking up patient names of abusers on the registry and identifying sites with adequate supplies.
Dr. Howard is assistant professor of pediatrics at The Johns Hopkins University School of Medicine, Baltimore, and creator of CHADIS. She had no other relevant disclosures. Dr. Howard’s contribution to this publication was as a paid expert to MDedge News. E-mail her at pdnews@mdedge.com.