A pаtient stаbilized оn а Secоnd-Generatiоn Antipsychotic (SGA) presents with complaints of profound inner motor restlessness, describing an intense, agonizing urge to constantly move her legs. On physical examination, she is noted to be shifting her weight from foot to foot and pacing around the examination room. Which extrapyramidal side effect (EPS) is this patient experiencing, and what is considered the first-line pharmacologic treatment for this specific condition?