Rebound Methotrexate Toxicity After Apparent Clearance in a Critically Ill Patient with Severe Fluid Overload
This case report describes a critically ill patient with severe fluid overload who experienced life-threatening rebound methotrexate toxicity five weeks after apparent clearance, illustrating how altered pharmacokinetics and drug sequestration in dynamic volume-overload states can render standard clearance thresholds unreliable.