No, Catnip belongs to the Nepeta family and Oregano is an Origanum.
I would not treat your cat with oil of oregano unless your vet says it is ok. Call up your vet and ask. You wouldn't want to hurt your cat by using something that is bad for it.
Oregano is great with tomatoes but it will not get you high.
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The difference between oil of oregano and oregano oil is nothing! One can use both types and the terms are interchangeable. Oregano oil or oil of oregano are great additions to cooking.
uses of oregano
The Cat Who Lived High was created in 1990.
In Telugu, Oregano is called Vaamu which is known for its antiseptic and antimicrobial properties.