Stimulant laxatives are used to treat occasional constipation. They work by stimulating the muscles in your intestines to help move stool through your digestive system more quickly. Stimulant laxatives come in different forms, including oral tablets, oral liquids, and rectal suppositories. Examples include bisacodyl (Dulcolax, Biscolax) and sennosides (Ex-Lax, Senokot). You can choose the form that best fits your needs.