In the UK, Peter Bradshaw of The Guardian awarded the film a maximum five stars, calling it "a gripping psychological thriller about big pharma and mental health that cruelly leaves you craving one last fix". He praised the lead performance from Rooney Mara as "compelling" who "lays down the law with her presence. She demonstrates a potent Hitchcockian combination: an ability to be scared and scary at the same time, and Soderbergh's film manages to introduce its effects in some insidious, almost intravenous way".  The . Club ' s Scott Tobias called Mara "superb as the glue that binds this fractured psychological puzzle," and commended Soderbergh's sophisticated direction: " Side Effects screws around in its own thriller architecture, toying with feints of structure and clever bits of misdirection, and otherwise playing the audience like a fiddle. At this point in his career, Soderbergh pulls it off with the unpracticed ease of a maestro."  Robbie Collin of The Daily Telegraph awarded Side Effects a maximum five stars and also acknowledged its debt to earlier psychological thrillers. He wrote: "There's a lot of Alfred Hitchcock in what follows, but even more Henri-Georges Clouzot , with whose classic spine-tingler Les Diaboliques (1954) Soderbergh's film shares a poisonous tang".  Peter Travers of Rolling Stone praised the film's performances, the script and direction, writing "Soderbergh delivers ticking-bomb suspense laced with psychological acuity about a world where mood-altering meds are as disturbingly prevalent as social media". 
Confusion and numbed emotions occurred at the start of treatment, but usually disappeared with continued use. Confusion has occurred in elderly patients who received high doses.
Inappropriate behavior may occur with anterograde amnesia.
Psychic and physical dependence occurred with chronic use at therapeutic doses; withdrawal symptoms may occur in patients with dependence when treatment is discontinued.
Anxiety, panic, irritability, aggressiveness/aggression, paranoid psychosis, and delirium occurred in patients with withdrawal symptoms.
Restlessness, agitation, irritability, aggressiveness/aggression, rage, delusions, nightmares, psychoses, hallucinations, and inappropriate behavior occurred in patients with paradoxical reactions, especially in elderly and pediatric patients.
Increased REM sleep and broken sleep with vivid dreams may persist for weeks after treatment is discontinued. [ Ref ]