What Is This Pill - One Side Has A and The Other Side Has 1 8 with a scored line between?

Pill imprint A 18 has been identified as Sertraline hydrochloride 100 mg.

Sertraline is used in the treatment of depression; panic disorder; obsessive compulsive disorder; social anxiety disorder; postpartum depression (and more), and belongs to the drug class selective serotonin reuptake inhibitors.

you can see an image at https://www.drugs.com/imprints/a-18-14516.html