Unsure if there is any truth to speculation that the shooter in this case was taking prescription drugs or not, but fwiw, 2 articles, each with different views about medication and school shooters...
Medication-Induced Violence | Do Drugs Play a Role in Mass Shootings?
"Mass shootings, particularly school shootings, have tragically become a topic of everyday conversation in America and, invariably, questions are asked about the mental state of the perpetrator. What sort of derangement can produce such senseless acts of violence? What are the causes of school and other mass shootings? It is unlikely there is only one cause in any situation—it is multifactorial—however, is there a straw that consistently breaks the camel’s back?
Media reports are increasingly focusing on one factor that has been found to be associated with dozens of mass shootings in America: the psychiatric medications the attacker may have been taking. Were they taking these medications or, similarly dangerous, withdrawing from them, around the time of the shootings? How long had they been taking the drugs? Could those drugs have produced or contributed to a state of mind that led to the assaults?"
"So we're verifying: In the past 20 years did the majority of mass shooters take psychotropic drugs?
VERIFY: In the past 20 years did the majority of mass shooters take psychotropic drugs before committing a crime?
To get our answer we consulted three criminal justice experts: a criminologist, sociologist and psychiatrist, who have all researched mental illness and gun violence.
They all agree: there is no link between psychotropic drugs and mass killings.
"No, it's not true..not true that a majority, not true that a lot, a few," James Fox, a criminologist with over 40 years experience who currently works at Northeastern University, explained.
"One of the cases that is often used to illustrate it is of Joseph Wesbecker, who was using Prosaic and about three or four weeks after being prescribed Prosaic went on a rampage in his place of employment killing eight and wounding 12 others," Fox said. "The thing about that is, this guy had been planning this thing for months, long before he started taking Prosaic."
Psychiatry and behavioral science expert Jeffrey Swanson agrees.
"There is no credible scientific evidence that I am aware of that would suggest psychotropic medications play any role in mass shootings," Swanson said."