Kara is 22 years old and has been diagnosed 6 months ago with Generalised Anxiety Disorder (GAD). She commenced Sertraline 3 months ago and has seen little improvement in her symptoms, despite also having CBT. She is seen today alongside her mother who is concerned that she is still constantly worrying and sleeping poorly. Kara feels very upset that treatment has not worked but denies any risk of self-harm or suicide.
What would be the next most appropriate management option?