"Side Effects" is a song written by Matthew Rogers, Ben Stennis, and Blake Bollinger and recorded by Canadian country singer Dallas Smith for his third studio album of the same name (2016). It was serviced to Canadian country radio the week of January 23, 2017 as the record's fourth single.

"Side Effects" debuted at number 50 on the Billboard Canada Country chart dated February 4, 2017 and has since earned Smith a record-extending fifteenth consecutive top 10 single.. It reached the top position on the chart dated April 22, 2017, giving Smith a third number one. With this ascension, Smith becomes the first Canadian country artist to have at least three number ones at country radio since 1995, and the first to post back-to-back number ones since Shania Twain last achieved the feat in 1998.

An accompanying music video was directed by Stefan Berrill and premiered February 24, 2017. Smith released a trailer for the video on February 17, 2017 with an announcement that the full video was to be released the following Friday. The "cinematic" video examines a relationship in the process of breaking down and ends in a car crash involving the two leads with an ambiguous outcome. The video's production has been compared to that of a feature film, with CISN-FM referring to it as a "mini-movie."

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