By Pat Anson, PNN Editor

Medications commonly prescribed to treat insomnia significantly increase the risk of death for older adults if the drugs are taken with opioids, according to new study.

Zopiclone, zaleplon and zolpidem – collectively known as “Z-drugs” – are sold under brand names such as Ambien, Lunesta and Sonata. Z-drugs are sedative-hypnotics and act in a similar way as benzodiazepines, but are considered safer because they belong to a different class of medication.

But after reviewing the medical records of over 400,000 Medicare patients aged 65 and older, researchers at Vanderbilt University Medical Center found that Z-drugs are nearly as risky as benzodiazepines. Patients using benzodiazepines and opioids had a 221% higher risk of death from any cause, while those taking z-drugs and opioids had a 68% increased risk of dying.

Benzodiazepines such as Xanax and Valium are primarily used to treat anxiety. Until recently, benzodiazepines were often co-prescribed with opioids to pain patients, a practice that is now discouraged because both drugs suppress respiration, which can lead to an overdose.

"Our findings indicate that the risks of benzodiazepine-opioid use go well beyond the recognized hazards of overdose. They also suggest that the z-drugs, thought to have better safety than the benzodiazepines, in fact are dangerous when prescribed in combination with opioid pain medications," said Wayne Ray, PhD, professor of Health Policy at Vanderbilt and lead author of the study published in PLOS Medicine.

"Our findings add urgency to efforts to limit concurrent prescribing of benzodiazepines and opioids. They also suggest that targeted warnings are needed to advise older patients and their providers regarding the potential risks of taking z-drugs with opioids."

Last year the Food and Drug Administration ordering drug manufacturers to update warning labels for benzodiazepines to strongly caution patients and providers about the risk of abuse, addiction, dependence and overdose, particularly when the drugs are used with opioids or alcohol.   

In 2019, the FDA also ordered stronger warning labels for Z-drugs, but in that case it was to caution people about rare side effects such as sleepwalking, sleep driving and other risky behaviors.