Quick answer: In Garfield: Escape from Monday, Odie's antidote is at Liz's clinic at the end of the village. Go to the clinic and collect it; Liz says she made it from original BBQ sauce. Source
Players also call it Odie antidote clinic or Odie remedy location.
How to find Odie's antidote
Go to the end of the village
Head for Liz's clinic, which she says is at the end of the village. Source
Collect the antidote
Grab Odie's antidote at the clinic. Liz later confirms that Garfield found it. Source
FAQ
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