Clavamox for cats is a broad spectrum antibiotic which fights infections of the skin and soft tissue. The medicine contains amoxicillin and clavulanate potassium. It is a prescription medication, so your vet must decide if your cat needs Clavamox. There is potential for allergic reaction, but generally speaking it is a relatively safe drug. Today I’ll share how it works, how much to give your pet and what to do if you’re worried about their progress.
- What do you use Clavamox for?
- How much Clavamox do you give a cat?
- How long should I give my cat Clavamox?
- Potential side effects and allergies
Having an unwell pet is incredibly stressful. When my cat was injured the vet gave him a bunch of different drugs to help him heal, and was great about explaining exactly what was being prescribed and why. But not everyone is this lucky. Sometimes your pet’s physician misses some information, and other times you are so worried that you can’t recall what was said. But never fear, today I’ll clear up the ins and outs of the antibiotic Clavamox.
What Is Clavamox For Cats?
This medication is an antibiotic in the penicillin family. Clavamox is a brand name for a drug that has, as its main active ingredients, amoxicillin and clavulanic acid. Amoxicillin fights bacteria by restricting their ability to form cell walls. This limits their growth.
Clavulanic acid inhibits enzymes produced by the bacteria that could neutralize amoxicillin. It only has weak antibacterial activity on its own, but helps the amoxicillin to work. Clavamox was developed specifically for dogs and cats. It is similar, but not identical, to some medications developed for humans.
Research And FDA Approval
The FDA has approved Clavamox for use in cats. While the use of amoxicillin trihydrate/clavulanate potassium has been better studied in humans, research has also tested its effectiveness in cats.
Clavamox significantly reduces the size of feline skin lesions and reduces evidence of bacterial infection. It is often the first choice for shelters treating animals with upper respiratory infections, which can arise in kennels and communal spaces for animals.
What Is Clavamox Used For In Cats?
Clavamox treats a wide variety of bacterial infections. It fights both gram-positive and gram-negative bacteria. Gram-negative bacteria have a structure that’s more resistant to medications because of an impenetrable cell wall.
It also works against both aerobic or anaerobic microorganisms. Aerobic microorganisms require oxygen to grow, while anaerobic ones do not.
This drug diffuses easily into the body’s tissues and fluids. It is effective against staphylococcus bacteria, streptococcus, E. coli, Pasteurella multocida and Pasteurella.
Clavamox For Infections In Cats
Vets may prescribe it for urinary tract infections, skin infections, respiratory tract infections, otitis media and interna (ear infections), and tooth and gum infections like gingivitis. It may also be prescribed for tuberculosis.
The antibiotic action of the medication kills off the bacteria that are causing the infection. Clavamox treats bite wounds, as well. This is because injuries like this often fester and can become infected.
How To Give Clavamox To Your Cat
Clavamox is orally administered. It is available in chewable or regular tablet form, with a coating to make it easier to swallow. Alternatively, you can get it as an oral suspension liquid, known as Clavamox Drops. Either of the different forms makes it easy to add Clavamox to food, hide in a treat, or offer with a syringe.
Clavamox is similar to some medications used by humans. So a pet owner may think that they can give human amoxicillin, for instance, to their cat instead of visiting their vet for a prescription. However, this is not recommended!
Despite similarities in medications, Clavamox was developed specifically for cats and dogs. Human medications, meanwhile, were developed specifically for humans. Use of medication in an unintended way can not only inhibit the effectiveness of the medications, it can potentially be dangerous for your pet.
Should I Buy Online?
Clavamox is only available on the order of a licensed veterinarian, as dictated by federal law. These days, you can find pretty much anything online. This includes pharmaceutical products that are only available with a prescription. It can be tempting, but it is also illegal and dangerous.
First, if you haven’t seen a vet, you don’t know exactly why your cat has certain symptoms. If you get it without seeing a vet, you’re taking a chance. If your self-diagnosis is incorrect, your cat will become more ill while you pursue the wrong treatment.
Secondly, there is another worry. Non-prescription drugs for cats may also not be legitimate. It could be mixed with something else. Alternatively, the actual dose might not match the packet.
Also, cats react differently to different medications, just like people do. However, your vet will have a better idea about what works for your cat and his condition, whatever it is.
Clavamox Dosage For Cats
The recommended Clavamox dosage for cats of average size is 62.5 milligrams twice a day. These can be adjusted for cats by weight, but only your vet can determine if that is necessary for a larger or smaller feline.
If you’re using drops, you’ll need to reconstitute it with water. When 14 ml of water is added, each ml contains 62.5 mg of Clavamox. That is, 50 mg of amoxicillin and 12.5 mg of clavulanic acid.
Chewable tablets come in different sizes: 62.5 mg, 125 mg, 250 mg, and 375 mg.
Length of Treatment
Many infections that are treated with antibiotics begin to go away within three days, but you must complete the course.
A typical treatment regime for skin and soft tissue infections involves administering it for 5-7 days. In the case of urinary tract infections, your vet may advise you to continue use for 10-14 days.
What Are The Side Effects?
All medications have potential side effects, and some cats might be allergic to certain antibiotics. Watch out for:
- Shortness of breath
- Swelling of the lips and tongue
If your kitty suffers severe allergic reactions to Clavamox, contact your vet immediately. Your cat may need epinephrine and steroids to control the allergic reaction.
Clavamox For Cats
Clavamox can be great for curing bacterial infections in cats. Used as prescribed, it is an effective feline antibiotic. Your veterinarian has most likely prescribed it because your cat has an upper respiratory issue, UTI, skin infection or dental problem. Hopefully with this drug your kitty will be feeling better in just a few days.
Has your cat had Clavamox? We’d love to hear about your experiences with Clavamox for cats in the comments section below.
I have a 15 year old 5 pound female cat who was diagnosed with bacterial bladder infection. Urine sample taken. No crystals present. Bladder is soft and feels normal. She was prescribed liquid clavamox 1 ml twice per day for 10 days. First dose given and 2 hours later, cat was vomiting and diarrhea. She stood up, stumbled and collapsed onto her side. I stopped the clavamox and called the vet. Vet called me the next day and said keep her off it. She didn’t offer anything else other than more testing. She cannot take the antibiotics, so I am left with no recourse.
Why should Clamavox be given with food? Is it not effective on an empty stomach?
The same reason you would have a cracker before taking medicine. It can be easier on your stomach if you have a little food there first.
Renee, how is your kitty?
Our 7 month old kitten went from high energy and active to lethargically sleeping and a fever. We were pretty worried so we took her to the Pet ER. They did blood tests and an X-ray, but could only find a fever of an undetermined origin. They rehydrated her and sent us home with Clovomax. After 2 days she was back to normal. It’s a mystery what was wrong some sort of bacterial infection I guess.
Our cat has occasional upper respiratory infections due to the Herpes virus. Treating it with Clavamox works wonders, but we are wondering if she is treated 3-4 times a year with it, will she be harmed in any way or develop an immunity at some point?
Louis Solomon says
I have a one year old cat bitten on the top of his paw about 7 months ago. The small wound will not heal, and has some puss.
I have tried many things, the vet gave me liquid Clamoxin, but he immediately coughs it up and is sick.
I had a lab test done and it says that he has a staff infection.
Should I try Clavamex 62.5mg. tablets, as it would be easier to dose him with tablets.
My cat got bit by a stray cat that came in our yard, and i soaked his paw in warm water with ‘plain’ epsom salts, for about 10 min, several times a day then rinsed paw. 3 days later was all better. So maybe along with antibiotics, this will heal his paw. Is always best to keep wound open, so can drain bacteria.
They can get feline aids from cat bites, but most cats live for a long time, even if they have it. But then you have to keep cat away from other cats so wont bite and spread. And keep cat away from any infections cause infections are what can cut their life short.
Ask vet, but my dog has 2 staph bacteria in her elbow, and vet gave her sulfa antiobiotics , i think is combination antiobiotic, and is clearing infection. But besides doing smear, . She also cultured to see what antibiotive the bacteria was sensitive to, to make sure was correct one.
Clavamox is the ONLY antiobiotic that has worked to start clearing up my 18 year old cats infected paws. It has caused some diarrhea, so I’m starting her on forteflora probiotic, and getting subQ fluids . Shes eating good though. The vet gave her shot, which did not help. then some other pills, and antifungal/ bacterial shampoo to use daily, which did not ckear infection. I have been cleaning my poor cats pus filled, swollen, claws daily, and, they have been so tender and so much pus and blk. junk all over most frint, and a few back claws….after 6 days on the Clavamix, they are FINALLY healing, much kess pus, less swollen, etc. Obviously, would be best if no diarrhea, but the nails were NOT getting better on any other antibiotic or me cleaning claws and soaking daily!
I would recommend getting a good cat probiotic to start with the Clavamox on day 1 though, because is such a strong antiobiotic. Ive had to take it before and also have to take high dosage of probiotics, but clears up bad infections!
Deborah Mitchell says
I adopted two 7 month old energetic kittens from animal care & control two weeks ago & did not keep them separated from my two old cats. within days, my 7yo cat started getting dry heaves & I took him to vet along with two kittens for observation. Temps were normal & cat was given antibiotic shot & seemed to do better. however, once I got home, one of kittens started sneezing and did so on cat’s communal dry food and water bowl, which the other cats consumed and now my 7yo cat has upper respiratory issues, including sneezing, water eyes, congestion. I have been giving him clavamox drops 1.0 ML twice a day for last 3 days and also bought a vaporizer. Keeping kittens and cats separated also. Cat still seems lethargic with same symptoms. how long should I continue to treat? I have read 5-7 days and 48 hours after symptoms subside.
I would definitely get your kitten or cats checked for the Ciliciavirus this virus is uncurable but it is highly highly contagious in cats and it’s an upper respiratory infection that I had eight cats die from I’m not trying to scare you but it is very serious there is a vaccine out for it so I would speak to your veterinarian and have them just do a test on one of the cats and if one test positive for that then you can almost rest assured that the others if they start having problems they have the same thing. I had to quarantine my cats from each other because I recently had kittens and I didn’t want them exposed to it and when my other cats start getting better I had to completely disinfect that room massively the food bowls the water bowls the litter box had to be dumped and disinfected the bedding the floors everything I even did the walls. A lot of times animals contract this from for example mine did when they went as a group to get spayed at this veterinarian clinic who did and excess over 100 spays and neuters a day and it wasn’t sanitary unbeknownst to me that’s how my cats contracted it. So anyway if you have any other questions I’ll be more than happy to explain it more to you like I said I’m not trying to scare you but I went through such a traumatic period with my babies I don’t want to have to see anybody else go through that. The best of luck
I just now looked at the year that this was posted from you so I guess I’m a little late but hopefully it’ll just be something that you’re aware of
Unfortunately my veterinarian does not prescribe the recommended duration of Clavamox for 10-14 days for UTI’s, even after showing them documentation. I was only given 7 days worth which is the recommendation for skin infections etc. The past 3 years my cat has had a UTI once a year and each time I had to go back for retesting. Her symptoms would get better after a few days, but after the medication is finished she starts to get them again. So then they give her an expensive shot convenia, which finally helped and the tests come back 0-2 WBC’s. Apparently that is normal my vet said. I believe it would of been cleared up if given the recommended duration 10-14 days. I have changed Veterinarians since. Please make sure your cat gets long enough duration so they don’t needlessly suffer and you spend excess money.
My cat (male 16 yrs old) had blood in his urine. So the vet put him on Clavamox. He took it for a week but it increasingly made him more and more nauseous. The vet told me to take him off. How long will his lack of appetite and vomiting last?
Dixie Rogers says
My cat will NOT take the chewable of this medication. I have crumbled it into his wet food and he refuses to eat it. Has a urinary track infection and just brought him home from vet today and will not take the first pill.
I was fostering a 4 week old kitten. Her breathing seemed very fast to me so I took her to the vet and she was prescribed clavamox .15 ml twice a day. She ended up passing away and I feel it could have been the medicine. She had no vomiting or diarrhea. Is this possible…I’m heart broken. I thought I was helping her. Is it possible the clavamox killed her?
Jennifer Waite says
Bronwyn, I can certainly relate to your heartache and your worry that the Clavamox was responsible for the death of your kitten. However, I sincerely doubt that the Clavamox played any part in your kitten’s passing.
First of all, Clavamox has been in use for treating bacterial infections of all kinds in cats for decades. It is often the go-to antibiotic of choice of Veterinarians because of it’s broad-spectrum properties and because it has proven to be one of the safest available medications of it’s kind. Your Vet would not have prescribed Clavamox if he or she did not believe it to be the best and safest treatment for your kitten’s condition, and the dosage that was prescribed was less than 25% of the standard dosage for an average-sized adult cat, making overdose extremely unlikely.
Even in an overdose situation or an allergic/adverse reaction to the medication, you would have seen some sort of obvious symptom that something was wrong (like vomiting or diarrhea), and you saw no symptoms at all.
The sad truth is that sometimes, very young kittens, especially when they are born with or develop an illness or infection soon after birth, just don’t make it. They just aren’t strong enough. Your kitten was only 4 weeks old, and ideally should still have been with it’s mother, or at least under constant care by a Veterinary professional until 6 weeks old before being fostered or adopted, which unfortunately is not always possible.
I know how much it hurts to lose a kitten this way, but try to take some comfort in knowing that you did all that anyone could have done. The kitten was most likely. just beyond saving by the time you came into it’s life — but however short the time was that he or she was in your care, he or she was loved and knew it.
After four days on liquid Clavamox, my cat started drooling horribly this weekend when I give it to him. I’ll try the tablets on Monday.
I have had a number of cats over the years who suffered the side effects of Clavamox, usually very watery diarrhea and often loss of appetite.
Last year,y elderly cat, Peaches (who had just turned 16 then) had dental treatments done and was given afterwards for 10 days. Byt day 3, he had completely lost his appetite and his stools were watery. Because he is very thin and cannot afford to lose more weight, we had to switch to a different antibiotic.
The latest experience was this past week. My 10 year old cat, Mimsy, has bronchitis. After 4 doses of Clavamox, she has lost her appetite and is vomiting in 4 or 5 places even when she just drinks water. So, I will not give her another dose until I can talk to the vet. Unfortunately, this is the Friday before a holiday, and his office is closed for a long weekend.
I don’t know how long the last Clavamox dose will affect her and keep her from eating, so all I can do is watch her carefully for any signs of other side effects.
Over the space of 5 decades, I have taken in and kept, literally, dozens of strays and abandoned cats. I can count on the fingers of one hand the number who tolerated Clavamox without really nasty side effects. Since I don’t think I’m the only person who has had repeated problems with Clavamox for cats, which makes me wonder why is it vets seem to always hand Clavamox out as the first choice of antibiotic. Surely, the recurring side effect hassles would be a hint that it might not be worth the upset and pain the cats go through when using it, especially when there are many other antibiotics available.
So far Clavamox is working great on my 15 year old with a upper respiratory issue. After two days I see a really good improvement. Before she took it she had started staying in the closet all day. Now she is returning to her old self. This med seems to be working.
Emily Nacchio says
Did you notice any lethargy and increased sleeping while on Clavamox?
Yes . My cat is taking clavamox chewable tabs. Y he stop to eat and vomited y he just wanted to sleep. I hope tomorrow hes will feel better
My poor sweet Luna has had a URI since last Friday and has been on Clavamox and an eye cream. She has 2 more days left.
I don’t know if it’s first time cat mom jitters, but I’m so nervous if she’s coping with the medication well. She’s no longer sneezing or coughing like she was, but she’s now so lethargic and she sleeping much more than usual. She squints her eyes often, but not all the time. And thankfully she’s playing a little bit. But still…Not my normal cat.
I did call to update the vet, but I just wanted to know if anyone else has had this experience and if I’m worrying too much. I just love her so much.
Any advice and comfort would be SOOOO appreciated!
My small cat is suffering. Im so sad and depressed. I took him about two weeks ago to the vet and ive been giving him clavamox as perscribed. He is underweight so i gave small amounts of a/d food. He was doing very well until a little while ago. I found him lying on his side, crying with pain, eyes partly shut and dialated, fluids coming out of his mouth, extreme rapid heartbeat, trouble breathing, then urinated bright canary colored urine then began to have some type of seizure with partial leg paralysis. He is very weak and off balanced. All occuring from out of nowhere. Its the worst thing ive ever witnessed. I dont know what to do. Im crying.
Clavamox saved my 8 mo old kitty who’d gotten gooey watery eye discharge and obviously lethargic, poor appetite with lank fur. After 3 days of 62.5mg chewable tab crushed in a tiny treat of tuna or salmon she started looking better. She did sleep more, but looked comfortable, w slower deeper breathing, and by the 5th day she was running around, playing, and first in line for food! Her fur looked fluffy again, and eyes clear and wide open. Don’t know if she really needs the full ten days, but will consult w vet tech. Thanks, Clavamox…working great!
Our 9 year old cat got a severe UTI. We tried Convenia and Zenequin but neither worked. We then were given a Clavamox prescription and he is now doing much better. He seems to not want to eat as much on it, but his UTI symptoms have cleared up nicely so far.
My cat was prescribed clavamox for a UTI, they didn’t do any tests, but I told them he was leaving tiny pee drops with trace amount of blood wherever he sat. Started noticing the discolorations on my bedspread but didn’t know it was him until I watched him get up, and right where his urethra had been was a fresh tiny wet spot with a tiniest bit of blood discoloration. Anyways, he is tolerating the pilling with one and a half of the 62.5 mg. I wrap him up like a burrito in a towel and open his mouth from the top with my fingers behind the fangs. I make a tiny ball of wet food and the pills,(And have it ready before I start) and drop it right in. I hold his mouth gently closed until he swallows then praise him and give him more wet food after.
I’m not sure what is wrong though, ever since he got back from the vet he has been meowing incessantly. I don’t know if he just traumatized from the vet visit or something hurts him, like his tummy. He meowed like this after he had his rabies shot too. He appeared fine before we went, no meowing at the litter box or straining to pee or anything like that. Anyone else have cats with tummy pain from this? I have noticed some diarrhea, but nothing else. Intake is fine.
my cat has an infection and abscess at the entry of the esophageal tube he has to be fed through while he’s on chemo. he has not had any nausea or diarrhea from chemo, but clavamox gave him both! in addition, he collapsed an hour after his third dose. someone else’s cat in this thread collapsed after taking it, so i hope my vet will give me another antibiotic. this is too strong a reaction.
I have a 19 year old Leopard-spotted Bengal that has been on Clavamox for a respiratory infection. Blood work is good, nothing spectacular. She has suffered with congestion for a couple of weeks now. Nothing in her lungs, so it’s not pneumonia, thank God. But we have tried liquid, pill, and shot forms of Clavamox which seem to make everything worse to the point she is experiencing labored breathing. What I do not understand is there are times when she doesn’t sound congested, and other times when she is raspy with every breath. I aspirate her as often as she will allow and she tolerates it well, considering. She has advanced bad tartar growth along her teeth. Her vet does not want to do a dental cleaning because of the risk (she has a heart murmur), but I do not want her to suffer like this anymore and feel if her teeth are not tended to, nothing will improve. Where do I go from here?