Fleet is the number 1 doctor-recommended brand for enemas(1). With Fleet Glycerin Suppositories, you get gentle constipation relief in minutes. Glycerin Suppositories are formulated with aloe and are a convenient alternative for those who prefer not to use a liquid enema for adult constipation. The suppository is easily inserted rectally, allowing it to act locally in the colon without having to go through the entire digestive system and is a good option for stimulant-free relief.