I have an anti depressant the is pink, oval and has an imprint of A on one side and 90 on the other?

Pill imprint A 0 6 has been identified as Citalopram hydrobromide 20 mg.

Citalopram is used in the treatment of anxiety and stress; depression; bipolar disorder; panic disorder; postpartum depression (and more), and belongs to the drug class selective serotonin reuptake inhibitors.

pill image: https://www.drugs.com/imprints/a-0-6-14464.html