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Systematic (IUPAC) name
Clinical data
AHFS/ monograph
MedlinePlus a607064
Legal status
Routes Oral, IV
Pharmacokinetic data
Bioavailability 90%
Protein binding 50-60%
Metabolism Hepatic (CYP2D6 and 1A2- mediated)
Half-life 10-12 hours
Excretion Renal (10%)
CAS number 31828-71-4 YesY
ATC code C01BB02
PubChem CID 4178
IUPHAR ligand 2629
DrugBank DB00379
ChemSpider 4034 YesY
KEGG D08215 YesY
Chemical data
Formula C11H17NO 
Molecular mass 179.259 g/mol
 YesY (what is this?)  (verify)

Mexiletine (INN, sold under the trade name Mexitil) belongs to the Class IB anti-arrhythmic group of medicines. It is used to treat arrhythmias within the heart, or seriously irregular heartbeats. It slows conduction in the heart and makes the heart tissue less sensitive. Dizziness, heartburn, nausea, nervousness, trembling, unsteadiness are common side effects. It is available in injection and capsule form.

Class IB antiarrhythmics decrease action potential frequency by lengthening the repolarization phase. This is achieved by blocking sodium channels.[1]

This drug is now no longer freely available as a licensed product in either the US or the UK. It can be imported to the UK as an unlicensed, 'named-patient' drug. Its use in arrhythmias is restricted to use in life-threatening conditions only.

Mexiletine may also be of use in patients experiencing refractory pain[2] and is also effective for treating muscle stiffness resulting from myotonic dystrophy (Steinert's disease) or nondystrophic myotonias such as myotonia congenita (Thomsen disease).


Mexiletine synthesis:[3][4][5][6]


  1. ^ Mexiletine,
  2. ^ Sweetman S (ed.) (2002). Martindale: The complete drug reference (33rd ed.). London: Pharmaceutical Press. ISBN 0-85369-499-0. 
  3. ^ H. Koppe, W. Kummer, U.S. Patent 3,954,872 (1976).
  4. ^ H. Koppe, W. Kummer, U.S. Patent 3,659,019 (1972).
  5. ^ C.H. Boehringer Sohns, Fr 1551055  (1968).
  6. ^ H. Koppe, W. Kummer, U.S. Patent 4,031,244 (1977).

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