HydrOXYzine HCl Oral Suspension (Anhydrous)
HydrOXYzine HCl is a compounded formulation containing HydrOXYzine HCl, 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 hydroxyzine HCl when a patient presents with allergic skin disease or acute inflammatory reactions such as hives (urticaria). It is frequently a point of discussion for pets experiencing persistent itching or seasonal environmental allergies where modulating the immune response is a clinical objective. Some veterinarians have also evaluated its use in the context of mild behavioral concerns, as its physiological profile includes sedative properties.
At a pharmacological level, hydroxyzine acts as a potent H1-receptor antagonist. It competes with histamine for H1-receptor sites on effector cells in the gastrointestinal tract, blood vessels and respiratory tract. By blocking these receptors, it addresses the localized swelling, redness and itching typically triggered by histamine release. Additionally, hydroxyzine possesses significant anticholinergic and central nervous system (CNS) depressant activity. It is studied for its ability to cross the blood-brain barrier and act on the subcortical regions of the brain, which contributes to its use as an adjunctive sedative. Your veterinarian will determine the appropriate dose and administration route based on your pet's species, weight and the specific nature of the allergic challenge.
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 hydroxyzine hydrochloride include sedation, lethargy and a temporary decrease in coordination. Some owners may observe anticholinergic effects such as dry mouth (xerostomia), increased thirst or localized gastrointestinal changes like vomiting or diarrhea. Because of its CNS depressant activity, your veterinarian will monitor for any significant behavioral shifts. If you observe persistent tremors, significant weakness or signs of an allergic reaction to the medication itself, contact your veterinarian promptly.
This medication is typically used with extra caution or avoided in patients with known glaucoma, urinary retention or significant cardiovascular disease, as its anticholinergic properties can influence these conditions. It is also carefully evaluated in pregnant or lactating animals, as the effects on developing offspring have not been extensively characterized in all species. Before starting a protocol involving hydroxyzine, ensure your veterinarian has a complete history of all other prescriptions and supplements your pet is receiving, as it may interact with other CNS depressants or certain antifungal medications. Your veterinarian will monitor your pet's response to ensures the protocol remains suitable for their individual health status.
Yes. Hydroxyzine hydrochloride is a prescription medication and can only be dispensed by a licensed pharmacy like Mixlab upon receipt of a valid authorization from a licensed veterinarian. Mixlab verifies all prescriptions before any medication is prepared or sent to your home.
Yes. While hydroxyzine is available in commercial tablet formats, Mixlab can compound this medication into specialized strengths or flavored dosage forms—such as flavored oral liquids or chews—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.
No. While both are first-generation antihistamines, hydroxyzine and Benadryl (diphenhydramine) are different medications. Veterinarians often discuss hydroxyzine as a primary option for chronic skin allergies because it may have a different duration of action or effectiveness for specific patients.
Sedation is a commonly observed effect of hydroxyzine because it acts on the central nervous system. The level of sleepiness can vary based on the individual pet and the dose your veterinarian determines is necessary to address their clinical signs.
