Generic name: Tocainide hydrochloride.

Tonocard is an anti-arrhythmic. It suppresses irregular heartbeats and helps to achieve a normal rhythm. 

Quick Facts About Tonocard


Used to treat arrhythmias: severe irregular hearty beats that are slower than normal (bradycardia) or faster than, normal (tachycardia). Effective in treating; ventricular arrhythmias.

Tonocard Dosage

Take on a regular schedule for Tonocard to be effective. If not taken regularly, may worsen symptoms.

  • Usual adult dose: 400 milligrams every 8 hours. Dose range — 1,200 to 1,800 milligrams per day divided into 3 doses. For individuals with reduced kidney or liver function — dose is lowered. Seniors — prescribed Tonocard with caution.
  • Usual child dose: not generally prescribed for children.
  • Missed dose: take as soon as possible, unless more than 2 hours after scheduled dose time have passed. In that case, do not take missed dose, go back to regular schedule. Do not double doses.

Tonocard Side Effects

Overdose symptoms:

no specific information available; however, likely signs of overdose would appear in the central nervous system, followed by stomach and intestinal disorders, leading to convulsions and heart and lung slowing or stopping. If you suspect an overdose, immediately seek medical attention.

More common side effects: confusion or disorientation, dizziness or vertigo, diarrhea, excessive sweating, hallucinations, increased irregular heartbeat, lack of coordination, loss of appetite, nausea, nervousness, rash, tingling or pins and needles, tremor, vision disturbances, vomiting.

Less common Tonocard side effects: arthritis, anxiety, chest pain, congestive heart failure, drowsiness, exhaustion, fatigue, headache, hearing loss, hot or cold feelings, involuntary eyeball movement, joint pain, low blood pressure, muscle pain, pounding heartbeat, rapid heartbeat, ringing in ears, sleepiness, slow heartbeat, sluggishness, unsteadiness, walking disturbances. Rare side effects: abdominal pain, agitation, allergic reactions, anemia, angina (crushing chest pain), blood clots in lungs, blood disorders, changes in blood counts, changes in heart function, chills, cinchonism (sensitivity reaction), cold hands and feet, coma, constipation, decreased mental ability, decreased urination, depression, difficulty breathing, difficulty speaking, difficulty sleeping, difficulty swallowing, disturbed behavior, disturbed dreams, dizziness on standing, double vision, dry mouth, earache, enlarged heart, fainting, fever, fluid in lungs, fluid retention, flushing, general bodily discomfort, hair loss, heart attack, hepatitis, hiccups, high blood pressure, hives, increased urination, lung disorders, memory loss, muscle cramps, muscle twitching or spasm, myasthenia gravis, neck pain or pain extending from the neck, pallor, pneumonia, seizures, skin peeling, slurred speech, smell disturbance, stomach upset, taste disturbance, thirst, weakness, yawning, yellow eyes and skin.


Inform your doctor before combining Tonocard with:

the anesthetic lidocaine (Xylocaine), blood pressure medications such as metoprolol (Lopressor), other anti-arrhythmics such as Quinidex, Procan, and Mexitil.

No known food/other substance interactions.

Special Cautions

Animal studies have shown increase in stillbirths and spontaneous abortions. If pregnant or planning to become pregnant, inform your doctor immediately. May appear in breast milk; could affect a nursing; infant.

Seniors are prescribed Tonocard with caution.

Not generally prescribed for children.

  • Do not take if you have heart block and you do not have a pacemaker, or if sensitive to or allergic to Tonocard or local anesthetics.
  • In first 3 months at increased risk for serious blood and lung disorders. Inform your doctor immediately if you experience: painful or difficult breathing, wheezing, cough, easy bruising or bleeding, tremors, palpitations, rash, soreness or ulcers in the mouth or throat, fever, or chills.
  • May worsen congestive heart failure.
  • Inform your doctor or dentist in a medical emergency or before surgery that you are taking Tonocard.

Note: provides accurate and independent information prescription pills, over-the-counter medicines and natural products. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment. If you have questions about  dosage, or Tonocard side effects, please contact your healthcare provider