Guidelines for ATC classification and DDD assignment - WHOCC

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Adenosine, which is also used as an antiarrhythmic, is classified in
C01EB.
Combined preparations are classified at separate 5th levels using the
corresponding 50-series. Combinations with psycholeptics are classified
at separate 5th levels using the corresponding 70-series. Combinations
with an antihypertensive e.g. reserpine are classified in C02AA.
The DDDs are based on the prophylaxis and treatment of
supraventricular and ventricular arrhythmias. The DDDs are based
on the maintenance dose. Preparations for parenteral
administration are only used initially and are therefore given the
same DDD as oral preparations.
C01BA Antiarrhythmics, class Ia
Combinations containing quinidine and verapamil are classified in
C08DA.
C01BB Antiarrhythmics, class Ib
Lidocaine used as a local anaesthetic is classified in N01BB. Phenytoin,
a class Ib antiarrhythmic, is classified as an antiepileptic in N03.
C01BC Antiarrhythmics, class Ic
C01BD Antiarrhythmics, class III
Sotalol, which has class III antiarrhythmic properties, is classified in
C07AA.
The DDD for ibutilide refer to ibutilide fumarate.
C01BG Other antiarrhythmics, class I and III