Overdose and 'giving too much' are 2 different things. An overdose is generally associated with medications that affect the central nervous system, such as pain meds, sedatives etc. BUT there are ALWAYS side effects to "giving too much" of a medication, ANY medication.
With antibiotics, giving "too much" can cause nausea, vomiting, diarrhea (and a LOT of diarrhea), Ph imbalance, promoting yeast infections in the mouth, etc. PLUS with antibiotics, you can set off a severe ALLERGY reaction to that antibiotic, which can cause skin itching, hives, respiratory distress, throat swelling, and these reactions can cause respiratory failure and death.
Just like with humans, NEVER give more than the prescribed dosage to any cat, dog, or other pet. AND each pet or human must be evaluated-- never give an animal or human a med prescribed for another pet or another human.
Only a vet will be able to prescribe the correct medicine for an ill cat. Never try and medicate a pet yourself as this could lead to overdose, and in extreme cases, death of the cat.
Some antibiotics can be too strong for cats, and some cats can even have allergic reactions to them just as humans can.For example and overdose of penicillin in cats will cause them to have seizures and even permanent neurological damage.
Cats tolerate penicillin, but the dosage varies from that humans take. Please take this animal to the vet -- even if you do get the right dosage of penicillin, and even if the cat isn't allergic, I presume from your question you're not able to suture the wound. Please get a vet invovled in this.
it is allergic to it you dip wad
The vet
Usually until it is all gone
Assuming you're not talking about an allergic reaction, no, penicillin has a wide margin of safety and has not been associated with systemic toxicity. Though you cannot overdose on penicillin, you could end up with severe diarrhea from taking too many at once. Also, just because you have not had an allergic reaction before to a drug, taking too many could cause an allergic reaction.
Fish pen penicillin can be given to a cat being treated for an infection. However, like with all drugs, it should only be given under the advice of a veterinarian.
This varies depending upon the formulation of the penicillin (injectable, topical, oral), the location and type of infection and the overall health status of the cat. If you believe your cat has a condition that needs treatment with penicillin, you should take your cat to your veterinarian.
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how one can identify overdose
You should really know what "bug" is causing the problem as penicillin doesn't not kill a virus. This might be a virus. Best to see and ask the vet.