A new study published in World Psychology has found that people who take some types of painkillers or use tranquilizers in medical procedures have an increased risk of committing a murder.

A 200 percent increase of homicide tendencies was found among those who took anti-inflammatory pain relievers while opioid pain relievers showed an increase by 92%.

According to European researchers, people who take benzodiazepines are more likely to commit a homicide than people that are not on those prescription drugs.

Benzodiazepines are a class of drugs designed to treat insomnia, anxiety, seizures, and panic disorders. The research team also found a tendency toward violent crimes in patients taking opiods or anti-inflammatory medications.

Dr. Jari Tiihonen, co-author of the study and a senior researcher from Finland, explained that these medications affect the patient's impulse control.

The study was conducted on nearly 1,000 people from Finland aged 13 to 88. All of them had been convicted of homicide between 2003 and 2011.

The study participants consisted of 88% mean the study and 4% were multiple victims. About 80% were intoxicated by either alcohol or an illegal drug at the time they committed the crime.

The researchers examined the national data bases containing their criminal activity, their medical history and prescription drug treatment.

Researchers found a troublesome link between certain prescription drugs and risk of killing someone. The findings revealed that that risk jumped 45% if the person had taken tranquilizers and by 31% if he/she was on antidepressants.

The most shocking result was that the anti-inflammatory pain killers boosted the risk of committing homicide by nearly 200%. Opioids hiked the risk by only 92%.