Rectal foam or suppositories to treat ulcerative colitis (proctitis) or for Crohn's disease affecting the rectum. Each dose is released by pressing the ferde of the inhaler. This type of inhaler is quick to use, small and convenient to carry. It needs good co-ordination to press the canister and breathe https://escatter11.fullerton.edu/nfs/show_user.php?userid=7325516