When people consider the connections between drugs and violence, what typically comes to mind are illegal drugs like crack cocaine. However, certain medications — most notably, some antidepressants like Prozac — have also been linked to increase risk for violent, even homicidal behavior.
A new study from the Institute for Safe Medication Practices published in the journal PloS One and based on data from the FDA's Adverse Event Reporting System has identified 31 drugs that are disproportionately linked with reports of violent behavior towards others. (More on Time.com:New Hope For An Anti-Cocaine Vaccine)
Please note that this does not necessarily mean that these drugs cause violent behavior. For example, in the case of opioid pain medications like Oxycontin, people with a prior history of violent behavior may seek drugs in order to sustain an addiction, which they support via predatory crime. In the case of antipsychotics, the drugs may be given in an attempt to reduce violence by people suffering from schizophrenia and other psychotic disorders — so the drugs here might not be causing violence, but could be linked with it because they're used to try to stop it.
Nonetheless, when one particular drug in a class of nonaddictive drugs used to treat the same problem stands out, that suggests caution: unless the drug is being used to treat radically different groups of people, that drug may actually be the problem. Researchers calculated a ratio of risk for each drug compared to the others in the database, adjusting for various relevant factors that could create misleading comparisons.