Administer Transdermal Medication

Transdermal Pen Application for Cats

The following information will guide you through the correct use of a transdermal pen, specifically for medications like methimazole.

Step 1: Prepare the Dose Quietly

Start by drawing up the dose—this means turning the pen the prescribed number of clicks. It may help to complete this step in a different room. Cats have very sensitive hearing, and preparing the pen out of earshot can help reduce stress and avoid chasing behavior.

Important: One click is not always equal to a full dose. Always follow the instructions printed on your pet’s prescription label.

Step 2: Dispense the Medication

Remove the cap from the pen. Click the base to dispense the correct amount of cream. Place the cream onto a gloved finger or finger cot, not directly on your cat’s ear.

Avoid using the pen’s built-in applicator unless specifically instructed to do so. Applying with your finger ensures gentle, accurate placement.

Step 3: Apply the Medication

Gently apply the cream to the inner surface of the ear flap (pinna), in an area with little or no hair where the skin is thin and well supplied with blood vessels. Use small, circular motions to rub the cream in until it is no longer visible. Do not place medication inside or near the ear canal.

Step 4: Alternate Ears and Keep Them Clean

To prevent irritation and residue buildup:

• Apply the dose to one ear and gently clean the opposite ear with a soft cloth dampened with plain water. Avoid dry cotton balls, which can leave fibers behind.
• At the next scheduled dose, switch ears: apply medication to the ear that was cleaned and clean the other.
• Alternating ears helps maintain comfort and ear health.

Step 5: Store the Pen Correctly

Methimazole is light-sensitive. Always store the pen in the amber plastic bag it was dispensed in. Keep the cap tightly in place to protect the medication.

Additional Tips:

• Methimazole cream is often prepared at concentrations such as 5 mg/0.1 mL or 10 mg/0.1 mL. Each click delivers 0.05 mL, so dosage depends on the strength of your pet’s medication.
• In most cases, two clicks is the maximum that can be applied comfortably to one ear. If a larger dose is prescribed, split the application between both ears.
• If your cat develops irritation, sores, or any adverse reaction at the application site, stop treatment and contact your veterinarian immediately.
• For cats new to ear handling, practice gently touching and stroking their ears at calm times to make the process easier.
• A fine, powdery residue may appear as the medication dries. Simply wipe it away with a damp cloth before the next application. Allow the ear to dry fully before applying the next dose.

Monitor your pet: Observe your pet for any reactions or signs of discomfort or if you notice any problems, stop the medication immediately and contact your veterinarian.

Dispose of the supplies: After the application is complete, remove your gloves and cleaning material, and dispose of it appropriately.

It’s crucial to follow your veterinarian’s instructions and only administer transdermal medications under their supervision. If you have any concerns or questions about medication administration, don’t hesitate to contact your veterinarian.

Please reach out to your Companion Pharmacy veterinary pharmacy team if you need assistance with your pet’s medication routine.