If you’ve ever wondered how long it takes Dulcolax to work, chances are you have that occasional problem of irregularity, constipation or hard stools. The good news is that there are formulas to suit every need. Dulcolax laxative tablets work overnight (6-12 hours). Dulcolax suppositories give even faster relief and work in 15-60 minutes. Dulcolax stool softener works gradually so you can get back to feeling like yourself without harsh side effects. For more information visit their website.