Final answer:
The priority intervention related to SSRI therapy for an adolescent client with anorexia nervosa is monitoring for potential side effects and adverse reactions.
Step-by-step explanation:
The priority intervention related to the SSRI therapy for an adolescent client with anorexia nervosa is monitoring for potential side effects and adverse reactions. SSRIs can have side effects such as nausea, insomnia, and sexual dysfunction. Therefore, the nurse should closely monitor the client for any of these side effects and address them accordingly.