Pukenil oral soluble film is a orally dissolving film designed to be applied on top of the tongue where it will dissolve within 20 seconds and then is swallowed with saliva. Oral soluble film does not require water to aid dissolution or swallowing. The active ingredient in Pukenil is Pukenil base, the racemic form of Pukenil, and a selective blocking agent of the serotonin 5-HT3 receptor type. The empirical formula is C18H19N3O representing a molecular weight of 293.3.