Amoxicillin for cats: what it is for and dose


Felines are susceptible to contracting multiple diseases and many of them of bacterial origin, perhaps they are a risk group since among their main characteristics an independent behavior stands out that translates into life outside the home, where the owner can not control any factor that Increase the risk of a bacterial infection.

As with humans, cats should receive treatment in the case of contracting a disease of these characteristics, and treatment in the case of a bacterial infection must be carried out through antibiotic drugs.

But does that mean what can I give my cat antibiotics? This is the question we answer in this Animal Expert article.

How do antibiotics work in cats?

Administering an antibiotic drug to a cat is not a banal matter, since these drugs have a very defined mechanism of action that may cause damage to the body of the animal Next we will observe that antibiotics can have two mechanisms of action to treat the pathology of our cat:

  • Bacteriostatic action: The antibiotic acts by inhibiting the proliferation of bacteria.
  • Bactericidal action: The antibiotic acts by destroying the bacteria that cause the infection.

Depending on the nature of the antibiotic, the drug may end destroying part of the cat's intestinal flora, formed by beneficial bacteria, but that the antibiotic is not able to distinguish from those that are causing the pathology.

What are the antibiotics that can be given to a cat?

Generally cats (as well as dogs) receive antibiotics approved for human use, being the best known amoxicillin, although we can also mention other active substances such as doxycycline or cephalexin.

However, the first reason why you cannot administer any antibiotic to your cat, lies in the differences between human physiology and feline physiology. That is, our body metabolizes each antibiotic in a certain way, but the cat metabolizes it in a different way, which implies a mustdose adjustment.

The second reason why you cannot administer antibiotics to your cat is that not all of them act in the same way or against the same bacteria, in addition, although many human antibiotics are used in pets, some can be potentially toxic for these.

Can I give my cat amoxicillin?

We have seen that there are several antibiotics for humans that are commonly used in cats and dogs, being one of the most commonly used amoxicillin. Therefore it is a frequent mistake to look for information about the dose necessary of amoxicillin for a cat and proceed to its administration, let's see why:

Amoxicillin is a broad-spectrum antibiotic, which indicates that it acts against a large number of bacteria. If your cat has an infection caused by an amoxicillin-resistant bacteria, something very serious will happen: the bacteria that are part of your cat's organism will be destroyed and the bacteria that cause the infection will proliferate without any bacterial competition, aggravating the pathology in a very dangerous way.

Amoxicillin, as well as any antibiotic drug, must be prescribed by a veterinarian, since in the event that the infection does not remit with a broad-spectrum antibiotic, in the veterinary clinic they will proceed to perform an antibiogram, a test that determines with which antibiotics the infectious bacteria can be attacked.

You can't give your cat any medication

Regardless of whether we talk about veterinary drugs or drugs indicated for human consumption, it is as usual as it is wrong for you to meditate on your cat, since the only person trained to prescribe a pharmacological treatment to our pets is the vet.

If you give your cat inappropriate medications you put his life in danger, causing him to cause serious poisoning, in addition, you can mask a serious illness that requires urgent veterinary attention.

This article is purely informative, at we have no power to prescribe veterinary treatments or make any kind of diagnosis. We invite you to take your pet to the veterinarian in case he presents any type of condition or discomfort.

If you want to read more articles similar to Can I give antibiotics to my cat?, we recommend you go to our Other health problems section.

CLAVAMOX ® is an antibiotic used to treat skin and tissue infections> Download Owner Information Sheet

These owner information sheets are Adobe PDF files that can be printed and read with Adobe Reader software. Click here to download the free Adobe Reader software.

If you do not want to download Adobe Reader software, you can view the owner information shown below.

We recommend reading this booklet before your dog or cat receives Clavamox®. It is also advisable to review the information each time your pet receives a prescription for this treatment.

This booklet is only a summary. It does not replace what your veterinarian has told you. For more information about Clavamox®, talk to your veterinarian.


Clavamox® is an antibiotic that belongs to the penicillin family. Clavamox® contains amoxicillin and clavulanate, and is known as enhanced penicillin. Antibiotics, also known as antimicrobial agents, are used to treat infections caused by bacteria, but they have no effect on viruses.

Clavamox® has demonstrated efficacy in the treatment of skin and soft tissue infections in dogs and cats, periodontal infections (related to teeth) in dogs, and urinary infections (bladder and kidney) in cats.


There are many kinds of bacteria that can affect various parts of the body. There are those that cause skin infections, such as ear infections, bleeding lesions in live meat called "hot spots", wounds and abscesses filled with pus. There are some that cause periodontal infections (related to teeth), while there are others that cause urinary infections (bladder and kidneys) or other problems.

There are also many types of antibiotics. Everyone has a special way to attack bacteria. Some prevent bacteria from proliferating so that the animal's immune system can destroy them. Others kill bacteria directly. In both cases, antibiotics work with your pet's organism to fight the infection.

Each antibiotic works only against certain bacteria, and may not have an effect on others. To treat your pet's infection you need the right antibiotic.

Clavamox® kills bacteria directly.


Sometimes dogs and cats get infections on the surface of the skin, in wounds or cuts. Without treatment, these infections can affect the general health of your pet. Skin infections can cause severe pain, hair loss, itching and / or bad smell. In addition to pain, if the infection occurs in a wound, it can delay healing. If the infected wound occurred on one leg, you may notice that your pet starts to limp. Clavamox® is used to treat many of these infections in dogs and cats.

Pets sometimes also get infections around the teeth and gums (periodontal infections). Without treatment, these infections can evolve to pain in the mouth, difficulty eating, bad breath and loss of teeth. Clavamox® can be used to treat periodontal infections in dogs.

Pets can also get infections in the urinary tract (bladder and kidneys). This can cause pain or make your pet feel the need to urinate more often. Other common signs are accidents at home and blood in the urine. Without treatment, these infections can cause kidney damage and cause the pet to become seriously ill. Clavamox® can be used to treat urinary infections in cats.


Veterinarians make their choice based on what they see and what they know about the health of your pet. The choice can be based on many things, for example:

  • Your pet's exam
  • The part of the pet's organism that is affected
  • The type of bacteria that causes the infection
  • The difficulty you have in administering an antibiotic to your pet

In some cases, your veterinarian may want to take a sample of the bacteria from the infection to do a culture and sensitivity test. The veterinarian will recommend this test in order to decide which antibiotic to use. The test can be very useful to identify infections that are difficult to treat.


Most pets that receive this treatment respond well. Most of the signs of infection begin to disappear in about 3 days. If not, it is likely that the pet

  • Have more than one type of bacterial infection
  • Have an infection caused by something other than a bacterium
  • Be under stress or have other diseases that weaken the body's ability to fight infection
  • Need a different antibiotic, because the bacteria causing the infection are not the type that Clavamox® can fight.

If your pet does not seem to improve, contact your veterinarian, who may want to do some additional tests. You may also change the type of antibiotic your pet is taking.


You may be asked to take the pet back to the clinic sometime during or after treatment. This will depend on:

  • The type of infection your pet has
  • The degree of illness of your pet
  • If your pet has had this infection previously
  • Need a different antibiotic, because the bacteria causing the infection are not bacteria that Clavamox® works against

Be sure to follow the veterinarian's advice. Bringing your pet to examine again may increase your chances of getting better. If you do not follow your veterinarian's recommendation to re-examine your pet, the infection may become more difficult to treat and more expensive.


Antibiotics must be prescribed by a veterinarian and must not be available in any other way. Clavamox® comes as a pill or liquid.

At home, you can give Clavamox® pills or liquid to your pet by mouth. Your veterinarian will teach you how and when to do it. Clavamox® is given twice daily for dogs and cats.

Always follow the instructions and administer the treatment in the correct way. This can help your pet get better faster and stay healthy for longer. If you do not understand the instructions, call your veterinarian.


You should give Clavamox® for as long as your veterinarian has indicated.

Some pet owners want to stop treatment when the animal feels better. That is not a good idea and can cause a lot of long-term damage. This should be done only if the veterinarian has indicated it. Although it seems that your pet is better, the infection may still be present. So if you stop treating your pet too soon, the infection may come back. And it can be much harder to control.

When these treatments are shortened or doses are missed, the growth of resistant bacteria can be encouraged. This type of bacteria can be harmful to both your pet and others, and also to people. Therefore, be sure to administer all treatment exactly as recommended by your veterinarian.

If you have difficulty administering the treatment to your pet, ask the veterinarian for help.


As is the case with any medication, Clavamox® can cause problems. Some pets may have an allergic reaction to this type of medication. Symptoms of an allergic reaction include swelling of the face, itchy skin, hives, vomiting, diarrhea or respiratory disorders. Allergic reactions can be serious and can occur very quickly. If you think your pet is having an allergic reaction to the medication, call your veterinarian immediately. These types of problems should be treated quickly.

Penicillins can cause lack of appetite, vomiting or diarrhea1. Since Clavamox contains amoxicillin, which is a member of the penicillin family, this is something you should keep in mind while your pet takes Clavamox. Be sure to contact your veterinarian if your pet has stomach disorders while receiving treatment with Clavamox.

Call your veterinarian if you notice any changes in your pet while taking Clavamox®.


Clavamox® should not be given to pets with a history of allergic reactions to Clavamox® or other medicines similar to Clavamox®, including penicillins or cephalosporins. Talk to your veterinarian if you are not sure about your pet's history with these types of medications.


  • Clavamox® tablets should be stored in a cool dry place at room temperature. (Do not remove the tablets from the foil strip until you are ready to use them.)
  • Clavamox® drops should be stored in the refrigerator. After mixing the solution, it can be used for up to 10 days. After that, be sure to discard any unused liquid.
  • Clavamox® is for dogs and cats only
  • Clavamox® must be prescribed by a veterinarian
  • Keep out of reach of children

Plumb, DC 2005.Amoxicillin, p. 42. In Plumb DC (ed), Plumb's Veterinary Drug Handbook. Blackwell Publishing, Ames, IA