
'Side Effect' fits within the horror genre through its use of supernatural elements and psychological terror. Typical horror facets it includes are possession, dark magic, and the theme of unintended consequences stemming from desperate actions. The film stands out by centering on a marriage's emotional trauma and intertwining it with occult intervention, which adds depth to the horror beyond mere scares. Rather than relying solely on jump scares or gore, 'Side Effect' explores the psychological unraveling of characters affected by a powerful evil, creating a layered narrative that combines marital drama with supernatural dread.