What is the appropriate management for propylene glycol poisoning?

Medical Advisory BoardAll articles are reviewed for accuracy by our Medical Advisory Board
Educational purpose only • Exercise caution as content is pending human review
Article Review Status
Submitted
Under Review
Approved

Last updated: September 12, 2026 • View editorial policy

Have a follow-up question?

Our Medical A.I. is used by practicing medical doctors at top research institutions around the world. Ask any follow up question and get world-class guideline-backed answers instantly.

Ask Question

Management of Propylene Glycol Poisoning

For propylene glycol toxicity, immediately discontinue the source, provide supportive care with aggressive fluid resuscitation and correction of metabolic acidosis, and initiate hemodialysis for severe cases with refractory acidosis, hemodynamic instability, or significantly elevated propylene glycol levels.

Recognition and Clinical Presentation

Propylene glycol toxicity presents with a characteristic constellation of findings that should trigger immediate intervention:

  • Hyperosmolality with elevated osmol gap (measured osmolality exceeds calculated osmolarity)
  • High anion gap metabolic acidosis due to lactic acidosis 1
  • Acute kidney injury (particularly in patients with pre-existing renal dysfunction)
  • Sepsis-like syndrome with hemodynamic instability
  • CNS depression ranging from altered mental status to coma 2

The diagnosis should be suspected in any patient receiving high-dose intravenous medications containing propylene glycol as a diluent—most commonly lorazepam, diazepam, or phenytoin infusions 3, 4.

Immediate Management Algorithm

Step 1: Source Control

Stop all propylene glycol-containing medications immediately. This is the single most critical intervention, as toxicity often resolves promptly after discontinuation in patients with normal organ function 5.

Step 2: Laboratory Assessment

Obtain the following to guide management decisions:

  • Arterial blood gas with lactate level
  • Serum osmolality (measured) and calculate osmol gap
  • Anion gap calculation
  • Renal function (creatinine, BUN)
  • Propylene glycol level if available (though treatment should not be delayed waiting for results)

Step 3: Supportive Care

  • Correct metabolic acidosis with sodium bicarbonate infusion
  • Aggressive IV fluid resuscitation to maintain renal perfusion
  • Hemodynamic support with vasopressors if needed for sepsis-like presentation
  • Airway management if CNS depression is severe

Indications for Hemodialysis

Hemodialysis is the definitive treatment for severe propylene glycol toxicity and should be initiated for:

  • Refractory metabolic acidosis despite bicarbonate therapy 1
  • Severe hemodynamic instability or sepsis-like syndrome
  • Significantly elevated propylene glycol levels (>659 mg/dL reported in severe cases) 3
  • Underlying renal or hepatic dysfunction (these patients cannot adequately clear propylene glycol) 1, 5
  • Clinical deterioration despite source control and supportive measures

Hemodialysis efficiently removes propylene glycol (small molecular weight alcohol similar to ethylene glycol) and corrects the osmol gap 5. Continuous renal replacement therapy (CRRT) or continuous venovenous hemofiltration (CVVH) are acceptable alternatives when intermittent hemodialysis is unavailable 3.

Role of Fomepizole

Fomepizole may be considered as adjunctive therapy in severe cases, as it inhibits alcohol dehydrogenase and prevents further metabolism of propylene glycol to lactic acid 3. However, evidence is limited to case reports. If used, continue until propylene glycol levels normalize and acidosis resolves.

Special Populations at Risk

Critically ill ICU patients receiving prolonged benzodiazepine infusions are at highest risk 4. Studies show 19% of ICU patients receiving IV lorazepam or diazepam develop metabolic evidence of propylene glycol toxicity 4.

Key risk factors include:

  • Renal insufficiency (impaired clearance)
  • Hepatic dysfunction (impaired metabolism)
  • High-dose or prolonged infusions (>2 mg/hour lorazepam equivalent)
  • Accidental overdose (as with infusion pump errors) 3

Monitoring and Cessation Criteria

Continue hemodialysis until:

  • Anion gap normalizes
  • Osmol gap resolves
  • Propylene glycol level <45 mg/dL 3
  • Acidosis corrects (pH >7.35, lactate <2 mmol/L)
  • Clinical improvement occurs

Prevention

The most effective strategy is limiting propylene glycol exposure in high-risk patients:

  • Use alternative benzodiazepines (midazolam) that don't contain propylene glycol 4
  • Monitor daily osmol gaps and anion gaps in patients receiving propylene glycol-containing infusions
  • Limit cumulative doses and infusion duration
  • Maintain high clinical suspicion in patients with unexplained metabolic acidosis

Critical Pitfalls to Avoid

  1. Delaying source control: Continuing the offending agent while attempting to treat the acidosis is futile
  2. Waiting for propylene glycol levels: These are often unavailable or delayed; treat based on clinical presentation
  3. Underestimating severity in renal dysfunction: These patients require earlier and more aggressive intervention
  4. Attributing acidosis to other causes: Propylene glycol toxicity mimics sepsis and can be missed in critically ill patients 4

The evidence base consists primarily of case series and observational studies 1, 3, 5, 4, but the consistent findings across multiple reports support this management approach. While the 2023 AHA guidelines 6 focus on other toxic alcohols and don't specifically address propylene glycol, the principles of extracorporeal removal for toxic alcohols apply directly to this structurally similar compound.

References

Related Questions

Are the ingredients in these eye drops (propylene glycol 0.6%, mineral oil, hydroxypropyl guar, dimyristoyl phosphatidylglycerol, polyoxyl‑40 stearate, sorbitan tristearate, boric acid, sorbitol, purified water) safe for use during pregnancy?
How should I manage a 30-year-old female with alcohol withdrawal who received lithium and lorazepam, now over‑sedated with episodes of hypotension, normal renal function, low calcium, metabolic acidosis, low albumin, and a blood alcohol level of 103 mg/dL?
Which of the following is the most likely cause of the high-anion-gap metabolic acidosis in this 50-year-old man with alcohol withdrawal, hypertension, stage IIIa chronic kidney disease receiving pentobarbital infusion (propylene glycol solvent) and isotonic saline infusion: alcohol-induced ketoacidosis, renal tubular acidosis, propylene glycol accumulation, or isotonic saline infusion?
Can cocaine use cause lactic acidosis (elevated lactic acid)?
How to manage lactate acidosis in a patient receiving epinephrine (adrenaline) infusion?
How should I document a referral for cardiopulmonary clearance in a female patient scheduled for hysterectomy?
Why is a magnet required and when should the pacemaker be deactivated in a pregnant patient with long QT syndrome undergoing procedures with monopolar electrocautery?
Is a positive blood culture for Staphylococcus hominis indicative of a serious infection?
What is the likely diagnosis and recommended treatment for a 27‑year‑old patient who reports a tendency to forget things?
What is Staphylococcus hominis bacteremia, how can I differentiate contamination from true infection, and what are the recommended management steps?
What is the appropriate treatment regimen for chronic hepatitis C genotype 2?

Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.