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Amoxicillin Tablets

Amoxicillin Tablets by Virbac

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Trade Names:
Amoxi-Tabs® (Cats)
Amoxi-Tabs® (Dogs)
Biomox® Oral Suspension
Biomox® Tablets

General Description:

A broad-spectrum antibiotic commonly used to treat many bacterial infections in dogs and cats (ex. bite wounds, dental infections, respiratory tract, gastrointestinal and urinary tract infections). Amoxicillin is available as tablets or as an oral suspension.

What is this drug?
• A broad spectrum, synthetic member of the penicillin class; an antibiotic
• Given by mouth

Reasons for prescribing:
• Because of its broad spectrum nature, it is useful against many bacteria infections and is frequently used when bacteria sensitivity is unknown
• Especially useful in anaerobic infections (those growing without oxygen)
• Often used in: bite wound infections, upper respiratory tract infections, dental infections, gastrointestinal tract infections, urinary tract infections

What dogs/cats should not take this medication?
• Pets known to have had an allergic reaction to penicillin or another antibiotic before
• Use with caution in very small animals who may be dehydrated or have kidney or heart disorders


For liquids, shake well before accurately measuring the dose.

Give this medication with or without food.

Give medication as directed by your veterinarian. Read and follow the label carefully.

Give the exact amount prescribed and only as often as directed.

Give this medication for as long as your veterinarian directs. Finish the entire course of treatment.

Ideally, give the medication at the same time daily.

What if dose is missed?

If a dose is missed, give it as soon as you can. If it is time already for the next dose, skip the missed dose and go back to the normal schedule. Do not give two doses at the same time.

What to tell/ask veterinarian before giving medication?

Talk to your veterinarian about:
• When will your pet need to be rechecked
• What tests may need to be performed prior to and during treatment with this drug
• Risks and benefits of using this drug

Tell your veterinarian about:
• If your pet has experienced side-effects on other drugs/products
• If your pet has experienced digestive upset now or ever
• If your pet has experienced liver or kidney disease now or ever
• If your pet has experienced any other medical problems or allergies now or ever
• All medicines and supplements that you are giving your pet or plan to give your pet, including those you can get without a prescription. Your veterinarian may want to check that all of your pet's medicines can be given together.
• If your pet is pregnant or nursing or if you plan to breed your pet

Storage and Warnings:

Store suspension in the refrigerator. Discard reconstituted suspension in two weeks.

Store tablets at room temperature in a cool, dry place. Keep away from heat and direct sunlight.

Keep this and all medication out of reach of children and pets. Call your physician immediately if you accidentally take this product.

People with allergies to penicillins or beta-lactam antibiotics should not handle this drug since allergic reactions could occur from contact.

Potential side effects:
• Nausea may be experienced. Give the medication with food to reduce effect
• Decreased appetite, drooling, diarrhea, vomiting
• Allergic reactions are rare, but if your pet shows irregular breathing, rash, fever, hives, scratching, puffiness or facial swelling, or anything else unusual, stop therapy and contact your veterinarian immediately

Can this drug be given with other drugs?

Yes, but possible interactions may occur with aspirin, chloramphenicol, erythromycin, tetracyclines, aminoglycosides, cephalosporins and probenecid.


Contact your veterinarian immediately if pet eats more than the prescribed amount.

What else should I know?

This is just a summary of information about amoxicillin. If you have any questions or concerns about amoxicillin or the condition it was prescribed for, contact your veterinarian.

As with all prescribed medicines, amoxicillin should only be given to the dog/cat for which it was prescribed. It should be given only for the condition for which it was prescribed.

(Ampicillin, Amoxicillin) 
Common Drug Name
Common Brand Names 

Ampicillin: Polyflex (injectable)   
Amoxicillin: Amoxi-Drops, Biomox, and  Robamox-V  
Generic products are available. 
Store at room temperature in a tight, light resistant childproof container.   
Once the oral suspension is reconstituted (the powder is mixed with water), store in the refrigerator and use within 14 days.  

Aminopenicillins, also called broad-spectrum or ampicillin penicillins. They are used for the treatment of susceptible bacterial infections such as bite wounds, and bladder, upper respiratory, and oral infections in multiple species including dogs, cats, ferrets, and birds. They are generally not effective against Staphylococcal infections.
Do NOT use ampicillin or amoxicillin in rabbits, guinea pigs, chinchillas, or hamsters since it will affect the normal bacteria in the gastrointestinal tract and possibly cause a fatal diarrhea. 
Dose and Administration 
Always follow the dosage instructions provided by your veterinarian. If you have difficulty giving the medication, contact your veterinarian.
Ampicillin: For best absorption of ampicillin, give 1 hour prior to feeding or 2 hours after feeding. May be given with
food if necessary to decrease side effects, such as vomiting. 
Amoxicillin: Oral amoxicillin is better absorbed from the gastrointestinal tract than ampicillin. Amoxicillin may be given with food. 
Reconstituted oral suspensions should be refrigerated and the remainder discarded in 14 days. Shake well before use.
Ampicillin and amoxicillin must be given for at least 7-10 days for effectiveness; if given less than that, infections are likely to recur or become worse. Follow your veterinarian’s recommendations and use all of the medication prescribed.
If you miss a dose, give it as soon as you remember. If it is almost time for the next dose, skip the one you missed and go back to the regular schedule. Do not give 2 doses at once. 
This medication should only be given to the pet for whom it was prescribed.  
Possible Side Effects 
May see lack of appetite, drooling, vomiting, or diarrhea. Contact your veterinarian if you observe any of these effects in your pet.
If your pet experiences an allergic reaction to the medication, signs may include facial swelling, hives, scratching, sudden onset of diarrhea, vomiting, shock, seizures, pale gums, cold limbs, or coma. If you observe any of these signs, contact your veterinarian immediately.  

Not for use in animals hypersensitive (allergic) to penicillins or beta-lactam
antibiotics such as cephalosporins. 
Aminopenicillins cross the placenta, although no detrimental results to fetuses have been reported. The safety of aminopenicillins in breeding, pregnant, or lactating animals (those nursing their young) has not been established.
Use with caution in very small animals who may be dehydrated or have kidney or heart disorders. 
Human Precautions

People with hypersensitivities (allergies) to penicillins or beta-lactam antibiotics such as cephalosporins should not handle the aminopenicillins, since allergic reactions could occur just from contact.  
Drug, Food, and Test Interactions
Consult your veterinarian before using ampicillin or amoxicillin with vitamins, supplements, bacteriostatic antibiotics (such as erythromycin or tetracyclines), or anticoagulants (blood thinners, such as heparin or warfarin), since interactions may occur.    
Ampicillin may cause false-positive urine glucose results. 
Signs of Toxicity/Overdose
May see vomiting or diarrhea. Dogs on high doses or long-term use may show signs of incoordination (difficulty walking). If you know or suspect your pet has had an overdose, or if you observe any of these signs in your pet, contact your veterinarian immediately. 
Keep this and all other medications out of the reach of children and pets.


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