Amphotericin B Oral Suspension (Anhydrous)
Amphotericin B is a compounded formulation containing Amphotericin B, 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 amphotericin B in the context of deep-seated fungal challenges, such as blastomycosis, histoplasmosis, cryptococcosis and coccidioidomycosis. Due to its specific pharmacological profile and potential for systemic influence, it is frequently a point of discussion for internal medicine protocols where rapid intervention is a clinical priority. Because this medication is not absorbed through the gastrointestinal tract, it is administered via specialized routes determined by your veterinarian.
At a pharmacological level, amphotericin B functions by binding to ergosterol, a primary component of the fungal cell membrane. This binding process creates transmembrane channels or pores that increase membrane permeability, leading to the leakage of intracellular potassium and other small molecules. This disruption of the fungal cell's structural integrity ultimately may help address the progression of the infection. While it is highly selective for fungal ergosterol, it can occasionally interact with mammalian cholesterol, which informs the close monitoring required during its use. Your veterinarian will determine the clinical appropriateness of amphotericin B based on the results of diagnostic testing and the species-specific needs of your pet.
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 amphotericin B administration include localized reactions at the administration site, fever and gastrointestinal changes such as a decrease in appetite or vomiting. The most significant clinical consideration for this medication is its potential for nephrotoxicity (systemic influence on kidney function). To manage this, your veterinarian will likely perform frequent monitoring of renal parameters, including BUN and creatinine levels, throughout the duration of the protocol. Owners should watch for behavioral shifts such as increased lethargy, changes in water consumption or a noticeable decrease in urination and contact their veterinarian promptly with any concerns.
This medication is typically used with extra caution or avoided in patients with pre-existing kidney disease or significant dehydration. It is also carefully evaluated when used concurrently with other nephrotoxic prescriptions or certain diuretics, as these combinations can increase the risk of renal challenges. Because various formulations (such as liposomal vs. conventional) exist to modulate the medication's safety profile, your veterinarian will select the specific version best suited for your pet's health status. Your veterinarian is the right person to provide guidance on the necessary monitoring schedule and any fluid therapy required to support your pet during use.
Yes. Amphotericin B 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.
Yes. While amphotericin B is available as a commercial injectable, Mixlab can compound it into specialized formats or alternative vehicles—such as topical or ophthalmic preparations—when your veterinarian determines a customized formulation is necessary for localized management. The decision to use a compounded product rests with the prescribing veterinarian.
Veterinarians discuss amphotericin B for systemic infections because of its potent ability to disrupt fungal cell membranes across a broad range of pathogens. It is often considered the gold standard for rapid management in severe cases where other oral antifungal medications may not be acting quickly enough to address the clinical situation.
Your veterinarian will typically require frequent blood work to monitor kidney function and electrolyte balance. This monitoring allows the veterinarian to adjust the protocol or provide supportive care, such as fluid therapy, to help manage the physiological impact of the medication on your pet's system.
