Bisacodyl USP 10 mg. Gentle Predictable Fast Relief. #1 Doctor Recommended Brand Among Stimulant Laxatives. Easy-to-insert comfort shaped Dulcolax Suppositories provide fast relief from constipation. Trust Dulcolax Suppositories to work within 15 minutes to 1 hour when inserted rectally. . Uses: for temporary relief of occasional constipation and irregularity • this product generally produces bowel movement in 15 minutes to 1 hour.