Categories: cat aggression

Best antibiotics for a cat bite

Cat bite and a preferred antibiotic. Photos: Michael.

These are the best antibiotics for cat bites (my thanks to InFocusL Culture that Infected Cat Bite (and Give Antibiotics):


  • Amoxicillin-clavulanate (Augmentin)


Add metronidazole to each alternative – used for anaerobic activity. It is unclear if metronidazole is always necessary and it is usually added for prophylaxis.

  • Doxycycline
  • Trimethoprim/sulfamethoxazole (Bactrim)
  • Penicillin VK
  • Cipofloxacin/levofloxacin


  • Cephalexin (Keflex)
  • Dicloxacillin
  • Erythromycin
  • Clindamycin

Preferred antibiotics for cat bites

Some Detail

Dr Robert James MD writing in Emergency Medical News provides us with some very useful information about the most effective antibiotics for cat bites. He incorrectly (sorry doctor) says that cats sometimes bite ‘for no good reason’. They always bite for a reason even if some people don’t understand it.

In order to decide the best antibiotics you have to find out ‘the microbiology of infected cat bites’. In other words you have to know what species of bacteria are deposited under the skin when the cat bites.

A study enrolled 57 people who’d been bitten. They had bad infections. Most of the bites were puncture wounds. Comment: these typically leave two or four ‘vampire’ holes in the skin. The infections had taken hold very quickly i.e. after 25 hours.

Five organisms were found that had been ‘injected’ into the person. They were aerobes and anaerobes. These are organisms which can survive where there is oxygen and without oxygen respectively.

Most common organism

The most common organism isolated (75% of bites) was of the Pasteurella species, particularly Pasteurella multocida. ‘Streptococcus and Staphylococcus were common aerobic organisms, but a number of anaerobes were also identified’.

Treatment should be directed at ‘Pasteurella, Streptococcus, Staphylococcus, and anaerobes’.

Personal experience

I suffered a nasty cat bite from my beloved cat. It is very rare. It was a case of ‘transferred aggression‘ and not aggression directed at me. It need almost immediate antibiotics. I was prescribed Doxycycline. They worked by it took ages – about 2 months as I recall. This was the correct antibiotic but the infection was bad. I could not be prescribed penicillin as I am allergic to it.


How much damage could a domestic cat do to a human?

There are two ways to answer the question, (1) the physical damage that a domestic cat can cause to the ...
Read More

My cat bit me because I didn’t bring him prawns today

Just to make one point clear first, he bit me gently but it was a very definite bite and he ...
Read More

Should we play with our cats like kittens do?

It occurred to me that when kittens play they discover the limits of their aggression towards other kittens. They can ...
Read More

Masochist allows cat to damage their hand?

It looks like this person deliberately allowed their cat to damage their hand. Is this self-harm by proxy? ...
Read More

Why do cats have so much bacteria in their mouths?

The question in the title makes a presumption that there is more bacteria in the mouths of cats than in ...
Read More

How do I know if my cat bite is infected?

It is easy to tell if your cat bite is infected. The illustration below tells you. I am referring to ...
Read More

Narcissistic, topless idiot terrifies his cat who bites him when singing

Is this what video making has come down to on the internet? Anything, anything for views, likes, loves and 5 ...
Read More
Please comment here using either Facebook or WordPress (when available).
Michael Broad

Hi, I'm a 71-year-old retired solicitor (attorney in the US). Before qualifying I worked in many jobs including professional photography. I have a girlfriend, Michelle. I love nature, cats and all animals. I am concerned about their welfare.

Recent Posts

A link between women’s love of cats and their concern for fairness and compassion?

There's a huge study out at the moment from the University of Southern California concerning…

4 hours ago

His childlike pet drawings have raised thousands for rough sleepers

You never quite know the formula for becoming an internet, social media sensation perhaps because…

8 hours ago

Woman isolated during lockdown with Ehlers-Danlos syndrome finds comfort in her cat companions

NEWS AND OPINION: It is a time to praise the domestic cat for comforting vulnerable…

10 hours ago

Cats Protection report that black cats are no longer being ‘left on the shelf’

Some good news for people who love cats, all kinds, no matter what their colour.…

10 hours ago

Is it normal for a cat to have one kitten?

I have to research this as I don't have first hand experience and my research…

23 hours ago

Woman mistook a rabbit for her cat

Although perhaps under the circumstances mistaking a rabbit for your cat is possibly acceptable, this…

1 day ago