Stimulant laxatives like senna and bisacodyl tablets generally take six to 12 hours to work, so they are often taken at night for morning relief. Bisacodyl suppositories work fast, usually in 15 to 60 ...

Medically reviewed by Lindsay Cook, PharmD Key Takeaways Dulcolax works in 6 to 12 hours, while Miralax takes 1 to 3 days.Dulcolax is best for short-term constipation, and Miralax can be used ...