FamOTIDINE/Ondansetron Transdermal Pen (6mL)
FamOTIDINE/Ondansetron is a compounded formulation containing FamOTIDINE, Ondansetron, prepared by Mixlab for veterinary use. Available by prescription.
A transdermal pen is a simple way to give your pet medicine through their skin—usually used for cats by applying gel to the inside of their ear.
Step-by-Step:
- Get the pen ready – Twist the pen to dispense a small amount of gel. If it’s your first time, you will need to “prime” it first (the gel should be flush with the edge of the tip)
- Wear gloves – Always use a disposable glove or finger cot so the medication doesn’t absorb into your skin.
- Twist to dose – Follow the pen’s directions (like two full twists) to get the right amount of gel out. Always click in a clockwise direction, clicking counter-clockwise will stop you
- Pick the spot – Apply to a hairless area, usually the inside of your cat’s ear. Make sure the area is clean and dry.
- Apply the gel – Dab the gel directly with the pen or use your gloved finger to rub it in gently. Avoid the ear canal.
- Let it dry – It usually dries in a minute or two. Try to keep your pet from rubbing it off.
- Recap the pen – This keeps the medication fresh.
- Wash your hands – Even if you wore gloves, wash thoroughly after.
- Reward your pet – A treat helps make it a stress-free routine!
- Store properly – Keep at room temp, away from sunlight. Track doses so you know when it’s time to refill.
Important: Only apply where your vet has directed—usually hairless areas. Never apply over fur or broken skin. Keep other pets from licking the area until it’s dry.
This compounded formulation combines famotidine, an H2-receptor antagonist, with ondansetron, a 5-HT3-receptor antagonist antiemetic — two different drug classes. In compounding practice, clinicians may consider a combination like this for a multi-targeted approach. Your veterinarian determines whether it is appropriate based on your animal's diagnostic findings.
This description reflects the general pharmacology of the active ingredient's drug class; your veterinarian determines whether this approach is appropriate for your animal.
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.
At a pharmacological level, famotidine manages gastric acid while ondansetron manages the vomiting reflex by blocking serotonin receptors in the peripheral and central nervous systems. Commonly observed effects include temporary digestive shifts such as constipation or behavioral shifts like lethargy. Because it influences serotonin pathways, your veterinarian will monitor for observational signs of sensitivity if used with other serotonergic medications. Owners should monitor for significant behavioral changes and contact their veterinarian promptly with concerns regarding the patient's response.
Yes. This combination of famotidine and ondansetron is a prescription medication and requires a valid authorization from a licensed veterinarian. Mixlab verifies all legal requirements before preparing any medication.
Yes. Mixlab specializes in compounding famotidine and ondansetron into customized strengths and flavored oral formats, such as flavored liquids or treats, to support easier administration. The decision rests with your prescribing veterinarian.
Veterinarians discuss this combination for pets presented with excess stomach acid and persistent nausea. This dual approach provides a method for managing digestive comfort during the recovery from various illnesses.
Your veterinarian will determine the appropriate duration of the management approach. They will provide a professional schedule to ensure the protocol remains suitable for your pet's digestive recovery.
Mild constipation is a commonly observed effect of ondansetron in some pets. Your veterinarian will provide guidance on monitoring your pet's stool consistency during the course of management.
