Compositions and methods for the treatment and control of various conditions in an animal which comprises administering to said animal an effective amount of a immediate release composition of about 0.5% to 50% wt/wt of active ingredient together with excipients to a total of about 100%, wherein said compositon dissolves in a relatively short period of time, e.g., 75 seconds or less, 5 seconds or less, or 3 seconds or less, upon administration to said animal.