Tylenol (acetaminophen) and Ibuprofen toxicity is due to an active metabolite made by the liver from the drug. This metabolite causes severe damage to liver cells and red blood cells. Dogs tend to have more liver damage, whereas cat's red blood cells undergo a transformation of their normal oxygen carrying hemoglobin to a non functional form called methemoglobin. One Children's Tylenol tablet contains almost twice the toxic level for a normal sized cat per kilogram of body weight, and the adult size Tylenol has more than six times the toxic level!
The following quotes are all from the American Veterinary Medical Association:
American Veterinary Medical Association "Animal poisoning by drugs is by far the most common type of small animal poison exposure, accounting for 75% of 1990 toxin exposures as reported by the AAPCC and 82 of 425 fatalities.""Due to the significant toxicity to pets in relatively minimal dosages, the recommendation is clear — Tylenol should not be given to dogs or cats. "
Acetaminophen can be toxic to dogs.
Read the label of any other medicine you are using to see if it contains acetaminophen, sometimesn abbreviated as "APAP"), diphenhydramine, or phenylephrine.
The symptoms may be:
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Vomiting
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Diarrhea
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Difficulty in breathing
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Dark colored urine
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Listlessness
If your pet ingests Tylenol, get them to a veterinarian right away for emergency treatment. The problem is more acute and life threatening in cats than in dogs (though by no means safe in your canine companion).
Aspirin, Ibuprofen, Phenylbutazone, Naproxen (NSAID toxicity)
There may be different views on this where you live, but Tylenol is Tylenol and it can be toxic. I'd probably go to the ER or at least get ahold of a vet that will talk you through how to induce vomiting, etc. If they all agree that this is okay, I really don't know what to say because it is not.