What Is It?: Antiarrhythmic agent. Mexiletine hydrochloride is used to treat severe irregular heartbeat (arrhythmia). Irregular heart rhythms are generally divided into two main types: heartbeats that are faster than normal (tachycardia) and heartbeats that are slower than normal (bradycardia). Arrhythmias are often caused by drugs or disease but can occur in otherwise healthy people with no history of heart disease or other illness.

How To Use: Administer with food or antacid to reduce GI upset.

More common side effects may include: Blurred vision, changes in sleep habits, chest pain, constipation, depression, diarrhea, difficult or labored breathing, dizziness, headache, heartburn, light-headedness, nausea, nervousness, numbness, poor coordination, rash, swelling due to fluid retention, throbbing heartbeat, tingling or pins and needles, tremors, upset stomach, vision changes, vomiting.

The symptoms of Mexiletine hydrochloride overdose may include: Coma, low blood pressure, nausea, seizures, slow heartbeat or other heart problems, tingling or pins and needles

Storage: Keep in the original container. Keep out of the reach of children and pets. Capsules and tablets may be stored at room temperature. Some liquids should be stored in the refrigerator (see the prescription label.)  Store all medicines away from excess heat and moisture. Do NOT store in the bathroom.

Note: If you miss a dose take it as soon as you remember it. However, if it is almost time for the next dose, skip the missed dose and continue with the regular schedule. Do not take a double dose to make up for the missed one.