Mexiletine HCI Suspension Compounded

As low as $47.95

Mexiletine is classified as a Class IB antiarrhythmic. It blocks sodium channels to slow down the rate of heart contractions. It is used primarily to treat and prevent premature ventricular contractions (PVCs) and ventricular tachycardia in dogs. It may also be helpful in treating myotonia congenita and other myopathies.

Mexiletine HCI Suspension Compounded
Mexiletine HCI Suspension Compounded

This medication requires a prescription.

To process your order we will require a prescription from you or your Prescriber. We will only compound and dispense upon receipt of a valid patient specific prescription.

Your Prescriber can fax us a prescription to:
You can download, complete section A and take the Prescription Authorization Fax form to your prescriber. Please use the Human Prescription Authorization Form or the Vet Prescription Authorization Form.

Mail your prescription to:
CareFirst Specialty Pharmacy
2200 Garry Road
Suite 1
Cinnaminson, New Jersey 08077

Our Toll Free Phone Number:

Please call toll free (844) 822-7379 to provide your prescriber's information.

Please call toll free (844) 822-7379 to provide your Pharmacy's information.


Are you a licensed Prescriber?

Register with us. Please click here to complete the on-line webform or you may click here (veterinarians) or click here (prescribers) to download and complete the registration.


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Please call toll free (844) 822-7379 to place your order.

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Mexiletine is classified as an antiarrhythmic, specifically a class IB antiarrhythmic. It can be helpful in treating some arrhythmias as well as some myopathies in dogs.

How is Mexiletine Used?

Normally, mexiletine is dispensed in capsule form. However, our pharmacy can also compound mexiletine into an oral suspension that may make it easier for your pet to ingest.

What is Mexiletine Used for?

Mexiletine is primarily used for certain types of arrhythmias in dogs, specifically premature ventricular contractions (PVCs) and ventricular tachycardia. It may also be helpful in treating myotonia congenita and other myopathies.

Ventricular Arrhythmias

Mexilitene is often used in dogs with PVCs and ventricular tachycardia, especially in cases where lidocaine was ineffective. It can be given both to treat these conditions and to prevent them from occuring in the future.

Side Effects and Important Information

The most common side effect associated with this medication is GI upset, including nausea and vomiting. This may be alleviated by taking this medication with food. Other side effects include:

  • Trembling/dizziness
  • Shortness of breath
  • PVCs
  • Chest pain
  • Seizures
  • Thrombocytopenia

If your pet experiences any side effects when using mexiletine, contact your veterinarian right away. Talk to your pharmacist or veterinarian if your pet is taking any other medications, as mexiletine may interact with other medications. Use the medication as prescribed by your veterinarian. The information provided is not intended to cover all possible uses. This information is generalized and not intended as specific medical advice. If you have questions about the use of your prescription, please contact your prescriber.


  • Plumb, Donald C. (2018). Plumb's veterinary drug handbook. Stockholm, Wis.: Ames, Iowa: PharmaVet; Distributed by Blackwell Pub.

Mexiletine HCI

Consult your veterinarian

This is a compounded medication specifically made for your pet based on a prescription from your licensed veterinarian. Compounded medications are not returnable.

Note: We currently ship prescriptions to all 50 states.

Troches and suppositories require refrigeration (ice packs) and will incur an extra charge of $19.95 per order.

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