Some medications easily pass through the skin into the bloodstream. This is helpful when pets will not take a medication by mouth. The veterinarian may prescribe a transdermal cream to be applied just inside your pet's ear tip. If your pet has been prescribed Methimazole, Prednisolone, Fluoxetine or another mediation to be applied to the ear tip, watch this video for stepbystep instructions on how to use the Micro Pen transdermal pen device to measure and apply the medication.