Many people wonder how long does it take for Miralax to work effectively. Generally, Miralax starts to soften stools within 1 to 3 days after the first dose. It draws water into the intestines, promoting regular bowel movements. For best results, it’s crucial to follow the recommended dosage and stay hydrated. If you don’t experience relief after a few days, consult your doctor to discuss your symptoms and explore other treatment options. Understanding how Miralax functions can help manage constipation more effectively.