New research suggests a single dose of methylphenidate (brand name Ritalin) can help to improve brain function in cocaine addiction, which ultimately could make it an add-on treatment for such addictions.
Researchers from the Icahn School of Medicine at Mount Sinai in New York performed imaging studies to develop their hypothesis. They found that the drug modified connectivity in certain brain circuits that underlie self-control and craving among cocaine-addicted individuals.
The research is published in the current issue of JAMA Psychiatry.
Previous research has shown that oral methylphenidate improved brain function in cocaine users performing specific cognitive tasks such as ignoring emotionally distracting words and resolving a cognitive conflict.
Similar to cocaine, methylphenidate increases dopamine (and norepinephrine) activity in the brain, but, administered orally, takes longer to reach peak effect, giving it a lower potential for abuse.
By extending dopamine’s action, the drug enhances signaling to improve several cognitive functions, including information processing and attention.
“Orally administered methylphenidate increases dopamine in the brain, similar to cocaine, but without the strong addictive properties,” said Rita Goldstein, Ph.D., who led the research while at Brookhaven National Laboratory (BNL) in New York.
“We wanted to determine whether such substitutive properties, which are helpful in other replacement therapies such as using nicotine gum instead of smoking cigarettes or methadone instead of heroin, would play a role in enhancing brain connectivity between regions of potential importance for intervention in cocaine addiction.”
Anna Konova, a doctoral candidate at Stony Brook University, who was first author on this manuscript, added, “Using fMRI, we found that methylphenidate did indeed have a beneficial impact on the connectivity between several brain centers associated with addiction.”
For the study, Goldstein and her team recruited 18 cocaine-addicted individuals. Participants were then randomized to receive an oral dose of methylphenidate or placebo.
The researchers used functional magnetic resonance imaging (fMRI) to measure the strength of connectivity in particular brain circuits known to play a role in addiction before and during peak drug effects. They also assessed each subject’s severity of addiction to see if this had any bearing on the results.
Methylphenidate decreased connectivity between areas of the brain that have been strongly implicated in the formation of habits, including compulsive drug seeking and craving.
The scans also showed that methylphenidate strengthened connectivity between several brain regions involved in regulating emotions and exerting control over behaviors—connections previously reported to be disrupted in cocaine addiction.
“The benefits of methylphenidate were present after only one dose, indicating that this drug has significant potential as a treatment add-on for addiction to cocaine and possibly other stimulants,” said Goldstein.