Side effects: Problems that occur when treatment goes beyond the desired effect. Or problems that occur in addition to the desired therapeutic effect. Example -- A hemorrhage from the use of too much anticoagulant (such as heparin) is a side effect caused by treatment going beyond the desired effect. Example -- The common side effects of cancer treatment including fatigue , nausea, vomiting, decreased blood cell counts, hair loss , and mouth sores are instances of side effects that occur in addition to the desired therapeutic effect. Drug manufacturers are required to list all known side effects of their products. When side effects of necessary medication are severe, sometimes a second medication, lifestyle change, dietary change, or other measure may help to minimize them.
But not every side effect is a bad one. Some are downright welcome. Take finasteride . Introduced in 1992 to treat noncancerous enlargement of the prostate gland , it was found to regrow hair (and is marketed for that purpose under the name Propecia). Today, millions of men use a low dose of finasteride to treat male pattern baldness . Similarly, minoxidil , originally marketed as an oral tablet for high blood pressure , was found to grow hair in those using it. Today, as a topical lotion or foam, it is a popular over-the-counter remedy for baldness.
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".