Dexlansoprazole is a proton pump inhibitor used to treat GERD, stomach ulcers, and other acid-related conditions by reducing stomach acid production. Taken once daily, it is generally well tolerated but may cause side effects like headache or nausea. Long-term use requires monitoring for potential issues like low magnesium or bone fractures. Regular follow-up with your healthcare provider is recommended to ensure safe and effective use.