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What are Amoxicillin Allergies?

Amoxicillin is a penicillin antibiotic that is used to treat bacterial infection in dogs as well as humans. Penicillins are a beta-lactam antibiotic that kill bacteria by inhibiting their ability to form a cell wall. Amoxicillin is used to treat infections of the respiratory and gastrointestinal tract, as well as the genitourinary system, skin and soft tissue abscesses. It targets staphylococcus aureus, streptococcus species, E. coli, and Proteus mirabilis among other organisms. Bacteria that produce beta-lactamase will not be affected by amoxicillin, however a combination medicine containing amoxicillin and clavulanic acid (a beta-lactamase inhibitor) may get around this drawback.

Some side-effects like vomiting and diarrhea are fairly common with amoxicillin. Allergic reaction is rarer, but can be more serious. As a penicillin, amoxicillin is one of the antibiotics most likely to cause an allergic reaction, although this is still extremely rare in dogs. Symptoms are typically limited to rash and watery eyes, but serious a life-threatening anaphylaxis is possible. Dogs that have had a prior reaction to another penicillin antibiotic should not take amoxicillin. Other beta-lactam antibiotics, like cephalosporins and cephamycins, should also be avoided, depending on the advice of a veterinarian. If your dog has had a reaction to amoxicillin, or another penicillin, you should mention this to the veterinarian any time an antibiotic is prescribed.

Amoxicillin is a common broad-spectrum antibiotic that is prescribed to dogs for a number of different infections. Penicillin antibiotics, like amoxicillin, have one of the highest rates of allergic reaction in sensitive individuals. Serious reactions are rare, but can be life-threatening.

Amoxicillin Allergies Average Cost

From 413 quotes ranging from $200 - $500

Average Cost

$250

Symptoms of Amoxicillin Allergies in Dogs

Watch for these symptoms if your dog has just started taking amoxicillin.

  • Rash (maculopapular lesions)
  • Redness (erythroderma)
  • Other types of skin lesion (blisters or scaling skin)
  • Itchiness (pruritus)
  • Incessant scratching
  • Watery eyes
  • Runny nose
  • Swelling and hives (urticaria-angioedema)
  • Purple rash caused by bleeding into the dermal tissue (purpura)
  • Anaphylactic shock (rare) (vomiting, diarrhea, difficulty breathing, collapse, death)

Types

There are number of different brand-name amoxicillin medications that deliver the antibiotic in the following ways.

  • Tablets or drops – recommended dose is approximately 10-20 mg/kg twice daily
  • Injection – recommended dose is 4-10 mg/kg once or twice a day
  • Combination tablet with amoxicillin and a beta lactamase inhibitor – recommended dose 10—20mg/kg twice daily
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Causes of Amoxicillin Allergies in Dogs

It is not known why some dogs have allergic reactions while others do not. You should look for symptoms of amoxicillin allergies in the following cases.

  • Starting amoxicillin treatment for an infection
  • Known sensitivity to penicillin or another beta-lactam antibiotic
  • General tendency to severe allergic reactions
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Diagnosis of Amoxicillin Allergies in Dogs

An amoxicillin allergy will be diagnosed if your dog exhibits symptoms after beginning an amoxicillin regimen, and confirmed if the symptoms resolve themselves when the medication is discontinued. A previous allergic reaction to penicillin or another beta-lactam antibiotics would also be a reason to suspect amoxicillin allergies and avoid the drug. You should always mention previous drug reactions whenever a new medication is prescribed. It’s also a good idea to read through the side-effects and possible responses, so you know what to look for in your dog. If your dog exhibits unusual symptoms after starting amoxicillin or another medication, call the veterinarian and ask for advice. Severe symptoms like excessive swelling, trouble breathing, or collapse should be treated as an emergency.

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Treatment of Amoxicillin Allergies in Dogs

If your dog’s symptoms suggest an allergic reaction, the veterinarian will recommend you discontinue taking amoxicillin immediately. Mild symptoms will clear up without further treatment, but the veterinarian may need to prescribe a different antibiotic to fight the original infection.

Severe rashes with blistering and broken skin may need to be treated with topical ointments to prevent further infection. Antihistamines and corticosteroids could also be prescribed to calm the immune system and reduce symptoms.

Dogs with anaphylaxis should be given an epinephrine injection immediately. If you have a dog Epipen at your house, this will help, but your dog will still need immediate treatment. Other emergency measures like additional oxygen, intravenous fluids, and even blood transfusion could be necessary to save your dog’s life. Your dog will need to stay in a veterinary hospital for a day or two until the symptoms have passed and all systems are functioning normally.

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Recovery of Amoxicillin Allergies in Dogs

Serious allergic reactions to amoxicillin are rare, and most dogs will make a complete recovery with veterinary treatment. There is no cure for an amoxicillin allergy however, so your dog will need to avoid amoxicillin and other penicillin antibiotics throughout his life. Make sure information about your dog’s allergies is stored in his medical file and mention them specifically anytime you are working with a new veterinarian. Even if your dog hasn’t experienced an allergic reaction, it’s a good idea to watch for symptoms anytime a new medication is started. If your dog has experienced an anaphylactic reaction to a drug or any other allergen, discuss getting a dog Epipen with your veterinarian. An immediate injection administered at home can help your dog survive long enough to get treatment.

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Amoxicillin Allergies Average Cost

From 413 quotes ranging from $200 - $500

Average Cost

$250

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Amoxicillin Allergies Questions and Advice from Veterinary Professionals

Need pet health advice? Ask a vet

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Ask a Vet

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Shih Tzu

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Four Years

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Unknown severity

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0 found helpful

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Unknown severity

Has Symptoms

Pale Tongue

My dog has been takin the antibiotic for 5 days today being the last. He is 16 lbs and taking 500mg a day. Today on the last day, we noticed his tongue is a little pale. He also got rabies shot, heart worm test and shot yesterday. Could it be an alergic reaction? should I give him Benadryl?

July 26, 2020

Owner

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Dr. Michele K. DVM

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0 Recommendations

Thank you for your question. The dose of amoxicillin is on the higher end of the range for him, but if he has been tolerating it well for 5 days, I don't think that you need to worry about that at this point. I would not give him anything if he is acting normally otherwise, eating and drinking and being himself. If he is dull, lethargic, doesn't want to eat, or vomiting, then I would have him seen by a veterinarian. I'm also not sure why he was on the amoxicillin so that may have a factor in this as well. If you are concerned, it would be best to call your veterinarian, as they know more about his situation, but from your description it sounds like he is okay.

July 26, 2020

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Pitbull/boxer mix

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8/9yrs

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Unknown severity

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0 found helpful

pill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filled

Unknown severity

Has Symptoms

Blood In Urine

Noticed blood in urine yesterday morning, she just ran out of her prednisone a couple nights ago and is in need of her allergy shot too but atm I dont have the funds had put last 20 in gas tank to get to work. So not sure if that is also the problem. No vet will take me around the area without paying full or half amount so I was wondering if it would be safe to give her some liquid amoxicillin (I have some one willing to give me what they had left from their pet) and some powdered cranberry or if that wouldn't be a good idea until I can get her to the vet thank you much appreciated

July 21, 2020

Owner

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Dr. Michele K. DVM

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0 Recommendations

Thank you for your question. I am sorry that she is having this problem. I would not give her those medications without knowing more what is going on, unfortunately. If she has a bladder infection, that is uncomfortable but not an emergency, and getting her in to see a veterinarian as soon as you can would be a good idea. If she is eating and drinking normally otherwise and seems comfortable, having her seen as soon as you can may be what you can do. I hope that all goes well for her.

July 21, 2020

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Max

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Pit Lab

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3 Months

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Serious severity

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0 found helpful

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Serious severity

Has Symptoms

Muscle Tremors

Max was said to have canine distemper and was prescribed amoxicillin. Has has what looked like two seizers with drooling from the mouth and constant muscle tremors since.could this be an allergic reaction to the amoxicillin?

Sept. 17, 2018

Max's Owner


Hi, can I asked what happened after? My corgi got desexed and after checkup from the vet they said she was recovering but she was all tired and didn’t eat, she had a fever and took antibiotics. Day 1 vomit and muscle tremors and constant resting Day 2 muscle tremors and wouldn’t eat and just rest

Sept. 24, 2018

Cindy N.

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Duma

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Golden Retriever

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3 Years

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Mild severity

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0 found helpful

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Mild severity

Has Symptoms

Not Eating
Throwing Up
Red Inner Ears

my golden retriever was prescribed 500mg amoxicillin pills about 2 weeks ago after he got neutered because his scrotum got all swollen. A few days later he got his scrotum removed but they said he should still continue the amoxicillin along with the pain killers. He finished his pain killers a few days ago and now just has 4 amoxicillin pills left. However, as of a few days ago he keeps shaking his head and tries to scratch his ear w/ his leg and I thought it was because he was getting sick of his e-collar but I checked his ears this morning and they are red on the inside and has thrown up twice since this morning and isn't eating. I'm not sure if maybe he's having an allergic reaction or has an ear infection because of the antibiotics. Since he only has 4 pills of amoxicillin should I stop giving them to him or continue? He is also going back to the vet on Wednesday to get his stitches taken out.

Sept. 9, 2018

Duma's Owner

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Cookie

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German shepherd mix

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1 Year

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Serious severity

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0 found helpful

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Serious severity

Has Symptoms

Frequent Urination

My dog got into a bottle of amoxicillin three days ago. We don't know how much she ate it was 500mg (couldn't be more than 4) she has had frequent urination today peeing three times in a thirty minute time frame even in her cage. Should we see a vet or is this a common issue. She has no other problems shes been playful and going.

May 25, 2018

Cookie's Owner

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Dr. Michele K. DVM

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1611 Recommendations

An overdose of Amoxicillin can cause urinary and kidney damage, and it would be a good idea to have Cookie seen by a veterinarian to have some lab work run and make sure that is okay. I hope that all goes well for her.

May 25, 2018

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Amoxicillin Allergies Average Cost

From 413 quotes ranging from $200 - $500

Average Cost

$250

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