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Mexiletine Rx

Starting at $1.43$1.07
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What is Mexiletine?

Mexiletine is an antiarrhythmic medication used to treat heart conditions in small animals. It is used to treat ventricular arrhythmias and has similar mechanism or activity to lidocaine. It is often used in combination with atenolol.

Side Effects of Mexiletine:

  • Vomiting or nausea
  • Trembling
  • Dizziness/unsteadiness
  • Shortness of breath


Mexiletine can be given with food to help alleviate upset stomach and vomiting. Mexiletine also appears to have fewer side effects than procainamide or quinidine.

It is important to give your pet this medication exactly as prescribed and to not discontinue the drug without consulting with your pet's veterinarian. If you miss giving your pet the dose, give it to him as soon as you remember. If it is close to the next dose, skip the missed dose and continue on your normal schedule. If you are unsure about when to give a missed dose, contact your pet's veterinarian.