When substance use and trauma intersect in the ICU

The ICU experience is traumatic. For someone with a substance-use history, it is more complicated than that.

For survivors and families in Chicago hospital settings: This article reflects clinical evidence and direct experience. If you're in the Chicago area or Illinois, contact me to discuss your concerns.

Someone with a prior history of substance use or addiction goes through critical illness and ICU admission. The experience is traumatic for anyone. For them, it is also potentially reactivating.

The psychiatric symptoms of trauma — hypervigilance, intrusive memories, nightmare-driven sleep disruption, the sense of needing relief from unbearable internal states — are, by themselves, strong drivers of substance use relapse.

When combined with medications used in the ICU — benzodiazepines for sedation, opioids for pain, sometimes stimulants — the vulnerability is heightened.

What changes with critical illness

Someone who had been stable for years after recovery from addiction may find the ICU experience destabilising enough to produce serious relapse risk. The hyperarousal, the nightmares, the sense of needing chemical relief from intolerable states — all of these are, on their surface, reasonable reasons to use.

This is complicated further if the person was on medication-assisted treatment (buprenorphine or methadone) before ICU admission. ICU protocols sometimes pause these medications or fail to plan for continuation, which creates withdrawal risk precisely at a time when the person's stress and psychiatric symptoms are highest.

The benzodiazepine complication

Benzodiazepines are often used in the ICU for sedation during mechanical ventilation. They are necessary and appropriate in that context. But someone with addiction history receiving benzodiazepines in the ICU is being exposed to a drug class they may have used before.

Discontinuation is usually straightforward if it is managed intentionally — tapered over days or a few weeks post-discharge. But if nobody plans for it or if discharge planning assumes the person will manage independently, they may find themselves in a situation where they have access to benzodiazepines and significant psychiatric symptoms that make their use feel essential.

Why integrated treatment matters

Treating the trauma without addressing substance-use risk leaves the person with unmanageable symptoms and no tools except the substance. Treating substance-use risk without addressing the trauma leaves the person with ongoing psychological distress that drives relapse.

Recovery requires both: trauma treatment from someone experienced with PTSD, and substance-use treatment that understands the relationship between the two.

The recognition matters

Many ICU survivors with substance-use histories go home, develop predictable PTSD symptoms, begin using again, and interpret that relapse as proof they will never recover.

In fact, it is often the expected response to unmanaged trauma in someone with a vulnerability to substance use. Treating the trauma changes the equation.

Published August 2026 · Reviewed for accuracy against the sources listed above.