Hi Tony, I personally used the following about a year ago, as prescribed by a Doctor. Found that it was RAPID and LONG LASTING and 100% effective. Haven't done any research or asked a Vet. All I know is, that it is EFFECTIVE and long lasting.
The chemical name(s):: 'ONDANSETRON ODT'...4mg
or
'ZOFRAN ODT'....4mg (Mfg.