The gastroesophageal reflux disease treatment market is evolving with P-CAB drugs gaining market share due to longer efficacy and convenience. However, second-generation PPI drugs are counterattacking with composite products. P-CAB treatments like HKINOEN's K-Cap and Daewoong Pharmaceutical's Pexuklu are leading, but competition is intensifying with new entrants like Cheil Pharmaceutical's Jacubo. PPI drugs, despite their limitations, are still dominant, and the introduction of PPI+antacid complexes aims to improve their effectiveness.