There is a metabolic pathway in cats which turns aspirin into cyanide. So I would expect the symptoms would be shortness of breath, panting, inability to move, and death.
Ibuprofen is an anti-inflammatory in the same family as aspirin. Cats have a metabolic pathway that causes aspirin to release cyanide. It is entirely possible that ibuprofen will kill cats, just as aspirin does.
Yes. It's made with acetominophen and aspirin, both of which are deadly to cats.
It is not advisable to use human drugs to treat animals unless recommended by your vet. Do not give aspirin to your cat as cats do not have the required enzymes to break it down. Aspirin is highly toxic to cats and can be fatal if administered.
The systoms of allergies are blemishes, a rash occurs or maybe something changes e.g. mouth swells or face swells there are loads of systoms and they are all different for every individual also depending what your allergic to and how your body reacts to it.
Fatigue
no cheating
In veterinary medicine, aspirin is avoided due to companion animals (ie, dogs and cats) being much more sensitive to the negative side effects.
Never, ever, EVER give 'human' medicine to animals without consulting a qualified vet ! You have no way of determining what is a 'safe' dose or whether the animal in question would suffer any side effects.
Yes
Immediately to 3 hours later
NONE cats should Never be given aspirins. Aspirin can be deadly to a cat.
Cat metabolism is very different from humans; drugs like aspirin that are innocuous to humans will kill a cat (there is a metabolic pathway in cats that turns aspirin into cyanide), and morphine, which makes humans sleepy, will make a cat hyper. Do not give any drugs to a cat unless advised to by a vet.