» Rat Guide     » Health Guide     » Care Guide     » Medication Guide     » Breeding Guide    

Clavamox (Amoxicillin/Clavulanate)

Antimicrobial Agents
Back to Antimicrobial Agents
Combination Drug:
Amoxicillin Trihydrate/Clavulanate Potassium , Amoxicillin Trihydrate/Clavulanic Acid


Clavamox, Augmentin, Synulox


Veterinary Products
    Oral suspension as: Clavamox Drops in 15-mL bottles containing 50 mg of amoxicillin trihydrate/12.5 mg of clavulanic acid per mL.
    Tablets: 62.5 mg, 125 mg, 250 mg, 375 mg, 500 mg, 625 mg, 1000 mg
Human Products
    Available in oral suspension, tablets, and chewable tablets


Amoxicillin, an aminopencillin beta-lactam, differs structurally from ampicillin by having an addition hydroxyl group on the phenyl ring. It is a bactericidal, broad-spectrum, antibiotic.

When Clavulanate Acid or its potassium salt form, Clavulanate Potassium, (beta-lactamase inhibitors) are used in combined form with the penicillins, such as amoxicillin, they prevent hydrolyzed penicillins like amoxicillin from being inactivated by bacterial beta-lactamases.
The antibacterial activity of Clavulanate Acid and its salt form Clavulanate Potassium are weak when used alone, and is therefore only available in combination form.

Studies have shown that amoxicillin/clavulanate has a wide range of activity against β-lactamase-producing strains of both Gram-positive and Gram-negative aerobes, facultative anaerobes, and obligate anaerobes.

Amoxicillin and clavulanic acid are both readily distributed into most body tissues and fluids. Note, that low concentrations of the drugs are found in saliva, sputum and uninflamed meninges while high concentrations are found in inflamed meninges. Both amoxicillin and clavulanic acid readily cross the placenta and are found in breast milk in low concentrations. Most of the amoxicillin is excreted unchanged in the urine. Excreted levels of clavulanic acid is reported to be only 1/5th that of amoxicillin.


Used to treat:
  • Lower Respiratory Tract Infections - caused by S. pneumoniae and M. catarrhalis.
  • Otitis Media - caused by S. pneumoniae and M. catarrhalis.
  • Skin and Skin Structure Infections - caused by β-lactamase-producing strains of S. aureus, E. coli, and Klebsiella spp.
  • Urinary Tract Infections - caused by β-lactamase-producing strains of E. coli, Klebsiella spp. and Enterobacter spp.

Clinical Note

Although amoxicillin/clavulanate is commonly used against infections caused by S. pneumoniae, it should be noted that the organism Streptococcus does not produce beta-lactamase. If the organism, Streptococcus, is identified on culture, an alternative choice would be to use azithromycin, or to combine the beta-lactamase inhibitor, amoxicillin-clavulanate, with azithromycin.

Drug Interactions or Contraindications

Concomitant use of Probenecid will increase the plasma level of this antibiotic.

Adverse Reactions

Blood:  anemias

GI:  anorexia,diarrhea

Other:  hypersensitivity reaction such as rash and itching.Prolonged high doses can cause neurotoxicity.When given orally the penicillins may alter gut flora,selecting out resistant bacteria residing in the colon(leading to superinfections).

Dosage Recommendations

Caution: Loose stool/diarrhea not an uncommon side effect of this antibiotic. Use higher doses judiciously where condition warrants. In the event loose stools/diarrhea can not be controlled with probiotics contact veterinarian immediately to reduce antibiotic dose, stopping antibiotic, or switching to another antimicrobial to prevent complication of enterocolitis.

6.25 mg/lb, PO, BID  4
Given over 10-14 days.


20 mg/kg, PO, q12hrs  34


30 mg/kg to 40mg/kg, PO, q12hrs  21. Dosage range used successfully in pet rats by Vanessa Pisano DVM.


100 mg/kg, PO, q12hrs  29. *Note: use cautiously*


  • May give with food,does not significantly reduce absorption of drug.
  • Give yogurt, Lactobacillus capsules/granules, or Bene-Bac to help maintain normal gut flora.
  • Can be used simultaneously with Gentocin or Amikacin, or Baytril (enrofloxacin), or azithromycin.
  • For oral suspension shake well, refrigerate, and discard any unused portion after 10 days.

Posted on June 23, 2003, 14:36, Last updated on April 28, 2014, 12:36 | Antimicrobial Agents

Rat Guide Logo
All other written and visual materials used by permission of specific authors for the sole use of the Rat Guide.
Brought to you by KuddlyKorner4u
See Logos page for linking to the Rat Guide.
Rat Guide brought to you by KuddlyKorner4u