US actress Jamie Lee Curtis reportedly made a frantic call to emergency officials after her friend suffered an apparent overdose.
Law enforcement sources have told TMZ.com that paramedics responded to the scene in Venice, California at approximately 9pm local time on Tuesday night after the actress called 911.
Curtis' friend was reportedly found passed out in the back seat of the star's vehicle.
Sources say the woman, who has not been named, suffered a "violent reaction" to a mix of alcohol and a prescription drug.
Curtis was apparently rushing her friend to hospital when she phoned emergency officials. It's understood Curtis called 911 when she realised that her friend's condition had worsened.
The woman was reportedly treated at a local hospital and has since been released.
A spokesperson for the actress has not commented on the claims.
News of the alleged incident comes just days after Curtis signed on to star in a new pilot for a medical drama.
According to Variety magazine, Curtis will play the "dynamic and distinguished physician and mother of now-adult quadruplets who grew up on a reality show".
Brothers & Sisters producer David Marshall Grant is behind the project.
Curtis currently plays Zooey Deschanel's mother on hit US comedy New Girl and last year appeared in two episodes of American crime drama NCIS.
