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C03AA03 - HydrochlorothiazideATC-DDD Version 2016. Source: WHO
C - Cardiovascular System
C03 - Diuretics

This group comprises diuretics, plain and in combination with potassium or other agents. Vasopressin antagonists are also included in this group. Potassium-sparing agents are classified in C03D and C03E.
Combinations with digitalis glycosides, see C01AA.
Combinations with antihypertensives, see C02L - Antihypertensives and diuretics in combination.
Combinations with beta blocking agents, see C07B - C07D.
Combinations with calcium channel blockers, see C08.
Combinations with agents acting on the renin angiotensin system, see C09B and C09D.

The DDDs for diuretics are based on monotherapy. Most diuretics are used both for the treatment of edema and hypertension in similar doses and the DDDs are therefore based on both indications.
The DDDs for combinations correspond to the DDD for the diuretic component, except for ATC group C03E, see comments under this level.

C03A - Low-Ceiling Diuretics, Thiazides

Combinations with potassium-sparing agents, see C03EA.

The different lipid solubility of the thiazides should be considered when assigning DDDs.

C03AA - Thiazides, plain
C03AA03 - Hydrochlorothiazide
DoseRoute of administrationNote
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