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Hi there, you are through to Dr. Jake. Im a UK based vet. Im sorry to hear of your concerns with your kitten, Molly.
side effects from these medications can occur though they are rare and i wouldnt expect them to cause lack of eating drinking and lethargy for a 2 day period- these products often cause neurological signs such as muscle twitches, seizure time activity, this may be related though it could well be a co incidence. this could be due to a gastrointestinal problem such as gastritis, gastroenteritis or pancreatitis which can cause these signs, there is also a possibility that if she has been left unattended outside she may have eaten something which has causes these signs, we see blockages commonly in animals which can result in lack of eating drinking and lethargy
this is quite a long time for a young cat not to eat. i would recommend making an appointment with a local vet for a full examination today. they will be able to provide a full examination , they will be able to assess her hydration status. they may provide medications to have at home to help her feel better and want to eat. they may also advise blood tests and imaging to make sure none of the conditions i have mentioned above are evident.
i hope all this information helps