Which of these is a potential contra-action of aromatherapy?

Increased micturition refers to an increase in the frequency of urination, which can be a potential contra-action of aromatherapy. This reaction may occur due to certain essential oils known to have a diuretic effect, which can promote increased urine production. As the body detoxifies and eliminates waste, clients might experience more frequent trips to the bathroom following a treatment.

In contrast, the other options listed—improved sleep, enhanced focus, and decreased stress—are positive outcomes commonly associated with aromatherapy, rather than contra-actions. These effects are generally sought after in therapeutic practices and arise from the calming and soothing properties of many essential oils. Therefore, while the first option reflects a potential reaction that some individuals may experience, the rest represent desirable therapeutic benefits of aromatherapy.