Allopurinol Oral Suspension (Anhydrous)
Allopurinol is a compounded formulation containing Allopurinol, prepared by Mixlab for veterinary use. Available by prescription.
How to Give Anhydrous Oral Suspension
Oral Suspension (Anhydrous) is a liquid medication that does not contain water in its base. This might be an oil-based or other special base to help stabilize the medicine. It will look like a regular liquid medication, but often needs a good shake because the drug can settle. Here's how to give it:
- Shake well each time to mix the medication (5-10 seconds).
- Measure the dose using the syringe/dropper provided or one recommended by your vet. Insert the top of the oral syringe into the bottle adapter. Turn the bottle upside down and pull the plunger until the medicine reaches the volume required
- Hold your pet steady: a towel or helper can assist with squirmy pets.
- Administer the dose slowly into the side of the mouth. Allow small pauses if needed for swallowing.
- Raise the head slightly to help the medication go down and clean any spills with a little water or tissue.
- Praise your pet and offer a treat or water (unless advised against feeding right after).
- Clean the syringe with water immediately after use. Store the bottle as directed, out of sunlight.
- Consistency is key: Shake each time, measure accurately, and contact your vet if any issues arise.
The uses and pharmacology described below reflect the FDA-approved labeling for this active ingredient; your veterinarian determines whether and how they apply to your animal's treatment plan.
Veterinarians most commonly consider allopurinol for the management of urate urolithiasis (bladder stones) and as part of a management approach for Leishmaniasis, a systemic parasitic infection. In dogs like Dalmatians, which often have a distinct physiological pathway for processing purines, your veterinarian may select this medication to manage the buildup of uric acid. By addressing these chemical levels, veterinarians can manage the risk of stone formation and support the patient's long-term urinary health.
At a pharmacological level, allopurinol acts by inhibiting xanthine oxidase, the enzyme responsible for the final steps of purine metabolism. Purines are broken down into hypoxanthine, then xanthine and finally uric acid. By blocking this enzyme, the medication decreases the production of uric acid, leading to higher levels of hypoxanthine and xanthine, which are more readily excreted by the kidneys. In the context of Leishmaniasis, the medication interferes with the parasite’s ability to synthesize essential proteins by acting as a substitute for hypoxanthine. Your veterinarian will determine whether allopurinol is appropriate based on your pet’s breed, diagnostic testing results and the specific clinical nature of the stones or infection.
Prescription only. Use only under the direction of a licensed veterinarian. This information is not a substitute for veterinary diagnosis, prescribing or monitoring. Compounded drugs are not approved by the FDA for safety or effectiveness.
Commonly observed effects of allopurinol include gastrointestinal changes such as vomiting, diarrhea or a decrease in appetite. A specific and significant consideration for pets on this protocol is the potential formation of xanthine stones. Because the medication may help address the conversion of xanthine to uric acid, xanthine levels in the urine may rise; consequently, your veterinarian will often recommend a specific low-purine diet and encourage increased water intake to manage this risk. Owners should watch for signs of difficulty urinating or the presence of blood in the urine and contact their veterinarian promptly if these behavioral shifts occur.
This medication is typically used with extra caution or avoided in patients with known severe renal impairment, as the kidneys are the primary route of excretion for the medication’s active metabolite, oxypurinol. It is also carefully evaluated in pregnant or lactating animals due to limited data on its effects on offspring. Before starting a protocol, ensure your veterinarian has a complete history of all other prescriptions your pet is receiving, as allopurinol can interact with certain antibiotics and immunosuppressive agents. Your veterinarian is the right person to provide guidance on the necessary duration of use and the appropriate monitoring schedule to ensure the management approach remains suitable for your pet's individual health status.
Yes. Allopurinol is a prescription medication and can only be dispensed by a licensed pharmacy upon receipt of a valid authorization from a licensed veterinarian. Mixlab verifies all authorizations before any medication is prepared or shipped to your home.
Yes. While allopurinol is available as a commercial tablet, Mixlab can compound this medication into specialized strengths or alternative flavored dosage forms—such as oral liquids—if your veterinarian determines a customized preparation better suits your pet's needs. The decision between a commercial and compounded product rests with the prescribing veterinarian.
Veterinarians discuss allopurinol for breeds like Dalmatians and Bulldogs because these dogs often have a genetic difference in how they process purines, leading to higher uric acid levels. Allopurinol may be part of a management approach for these levels to support the prevention of urate stones, though its use is always determined by a professional evaluation.
In many cases, veterinarians recommend a low-purine diet and increased hydration for pets taking allopurinol. This is because the medication shifts purine metabolism and a specialized diet may be part of a management approach for the risk of xanthine stone formation, which can occur as a byproduct of the medication's mechanism.
