Cat abnormal behavior

I have two cats, the first one got sick and was drooling and puking. I took her to the vet and she just needed cerenia and was fine. She passed the drooling on to my other cat who is now drooling (no puke) but she has also been acting a little weird. She has been hitting at the floor where there is nothing as if she was playing with a bug. I am not sure if she was doing this before getting sick, but it for sure is a new thing. I also looked online at the drooling symptom and it said that 7-10 days she should be feeling better so I was going to wait the drooling out out since it is expensive to go to the vet. I tried to buy cerenia for cats online but I could only find cerenia for dogs. What advice do you have? Why is she hitting at the ground (my first cat didn't do this). Thanks so much in advanced. Sorry if this is scattered I am just concerned

Hello!  This raises an interesting point.   Cerenia works on the brain to block vomiting and this can sometimes be helpful.  However, it is not a generalised treatment for  illness; it doesn't make the animal magically well again.  Rather, it is only a way of controlling that one symptom and should be recognised as such.   Sometimes, when cats vomit, they are vomiting for a very good reason; perhaps they swallowed a foreign body and are trying to hoik it back up;  perhaps they have worms or poisoning or stomach cancer or kidney failure or one of many other problems.  Stopping cats from vomiting using chemicals can stop them from becoming dehydrated, but only when you know why they are vomiting, and that preventing vomiting won't make things worse, or mask existing signs of illness. Furthermore, if a cat was dehydrated and needed fluids and was simply given cerenia at home, the vet would never get chance to identify or treat the dehydration and cerenia by itself would not be appropriate. For this reason in the UK, Cerenia is a prescription only medicine and can only be prescribed by your vet, who will review each individual case and should only prescribe it appropriately. We would recommend that you book an appointment.

I am unsure what is causing the strange behaviour.  It could be neurological,for example.   However, this makes this case different from the other cats' and I'm afraid that a vet appointment is still the best way to identify what is going on.

It could be that this case is exactly the same as the previous one - a one off uncomplicated gastroenteritis for example - and cerenia is thought to be appropriate.  You could even ask the vet to write a prescription of cerenia instead of selling it to you.  But the other stages- the examination, assessment for dehydration etc should not be missed out, as symptoms or complications might be missed.