Chronic diarrhea, rectal irritation, stomach cramping, abdominal distension and electrolyte depletion are possible side effects of prolonged use of Dulcolax, notes Drugs.com. Rare but serious side effects include dizziness, irregular heartbeat, a decrease in urination and confusion. Individuals should seek medical advice for these and any other persistent symptoms.
Dulcolax is a treatment for occasional constipation. The active ingredient, bisacodyl, stimulates the bowel, helping the stool to pass through it. It is available without prescription and comes in either suppository, liquid or tablet format. Dulcolax works within 8 to 12 hours if taken before bed and 6 hours if taken during the day, according to WebMD. Those with intestinal blockages should not use it as a treatment.