See also C03 - Diuretics, C07 - Beta blocking agents, C08 - Calcium channel blockers and C09 - Agents acting on the renin-angiotensin system. Antihypertensives are mainly classified at 3rd levels according to the mechanism of action. Most headings are self-explanatory: C02A Antiadrenergic agents, centrally acting C02B Antiadrenergic agents, ganglion-blocking C02C Antiadrenergic agents, peripherally acting C02D Arteriolar smooth muscle, agents acting on C02K Other antihypertensives C02L Antihypertensives and diuretics in combination C02N Combinations of antihypertensives in ATC gr. C02
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