Dead Ringers

From Wiki; "Dead Ringers is a 1988 psychological drama film starring Jeremy Irons in a dual role as identical twin gynecologists. Director David Cronenberg co-wrote the screenplay with Norman Snider; their script was based on the novel Twins by Bari Wood and Jack Geasland. The film is very loosely based on the lives of Stewart and Cyril Marcus."
This movie has aged well over 24 years as much to do with the sets and direction as Jeremy Iron's portrayal of identical twins, both brilliant gynaecologists. From the opening scene the twins Bev and Ellie occupy a world of their own which they are able to maintain up to the point where a somewhat unethical aspect of their medical practice leaves them unable to continue working. A close relationship with a patient, Claire played by Genevieve Niveau sees Bev beginning to use drugs to smooth his difficulties with their relationship. With a bedside copy of 'The Physician's Desk Reference' Claire is a willing partner until her work takes her out of town and Bev succumbs to a depression that Ellie attempts to deal wit Then the fun really starts.
The following excerpt from Wiki might pique your interest; " was voted for in the 2002 Sight and Sound Poll by Lalitha Gopalan.[6] In 1999, Rolling Stone listed Dead Ringers as 95th on their list of 100 Maverick Movies.[7] Total Film placed Dead Ringers 35th on their list of the "50 Greatest Horror Movies Of All Time"[8] while Entertainment Weekly placed it 20th on their list of The 25 scariest movies of all time.[9] In 2004, the Toronto International Film Festival Group named Dead Ringers the 6th best Canadian Film ever made.[10] It was named one of "The Top 10 'True-Story' Horror Movies of All-time!" by Bloody Disgusting."