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This group comprises substances used for the treatment of cardiovascular conditions.
Drugs used for the treatment of hypertension are classified in C02 - Antihypertensives, C03 - Diuretics, C07 - Beta blocking agents, C08 - Calcium channel blockers, and C09 - Agents acting on the renin-angiotensin system. For the classification of combination products of antihypertensives from different ATC groups, the following ranking should be used, from higher to lower precedence: C09, C07, C08, and C03.

This group comprises preparations used in the treatment of arrhythmias.
The agents are listed according to the Vaughan Williams classification of antiarrhythmics. The division of class I antiarrhythmics may vary, depending on the literature used. The 3rd ed. of Averys "Drug Treatment" (1987) and "Drugs" 31, 93 - 95, 1986 are used as a basis for the ATC classification. Class II antiarrhythmics see C07 and class IV, see C08 (e.g. verapamil).
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.

Lidocaine used as a local anesthetic is classified in N01BB. Phenytoin, a class Ib antiarrhythmic, is classified as an antiepileptic in N03. Mexiletine indicated for myotonic disorders is classified here.

ATC code	Name	DDD	U	Adm.R	Note
C01BB01	lidocaine	3	g	P
C01BB02	mexiletine	0.8	g	O
		0.8	g	P
C01BB03	tocainide	1.2	g	O
		1.2	g	P
C01BB04	aprindine	0.1	g	O
		0.1	g	P

List of abbreviations