Dulcolax Pico Liquid (100ml). Dulcolax Pico Liquid contains a medicine called sodium picosulfate. This belongs to a group of medicines called laxatives.. • Dulcolax Pico Liquid is used for relief of constipation.. • This medicine does not help with weight loss. • Dulcolax Pico Liquid gently stimulates the muscles of the bowel (large intestine). This brings predictable, overnight relief from constipation, helping to return the body to its natural rhythm.