Took 3 dulcolax but nothing happened? what do i do?

Hydrate, hydrate: Stay well hydrated (at least 8 - 8 ounces glasses of water per day). Try to get in 5 servings of vegetables and 4 servings of fruit per day – get that fiber in. Stay physically active if possible. There are a number of over the counter laxatives that can be taken orally to help pass retained fecal matter. See your medical provider if unable to pass stool after these options have been tried.