# ATC code C03

ATC code C03 Diuretics is a therapeutic subgroup of the Anatomical Therapeutic Chemical Classification System, a system of alphanumeric codes developed by the World Health Organization (WHO) for the classification of drugs and other medical products. Subgroup C03 is part of the anatomical group C Cardiovascular system.
Codes for veterinary use (ATCvet codes) can be created by placing the letter Q in front of the human ATC code: for example, QC03. ATCvet codes without corresponding human ATC codes are cited with the leading Q in the following list. National issues of the ATC classification may include additional codes not present in this list, which follows the WHO version.

## C03A Low-ceiling diuretics, thiazides
### C03AA Thiazides, plain

    C03AA01 Bendroflumethiazide
    C03AA02 Hydroflumethiazide
    C03AA03 Hydrochlorothiazide
    C03AA04 Chlorothiazide
    C03AA05 Polythiazide
    C03AA06 Trichlormethiazide
    C03AA07 Cyclopenthiazide
    C03AA08 Methyclothiazide
    C03AA09 Cyclothiazide
    C03AA13 Mebutizide
    QC03AA56 Trichlormethiazide, combinations

### C03AB Thiazides and potassium in combination

    C03AB01 Bendroflumethiazide and potassium
    C03AB02 Hydroflumethiazide and potassium
    C03AB03 Hydrochlorothiazide and potassium
    C03AB04 Chlorothiazide and potassium
    C03AB05 Polythiazide and potassium
    C03AB06 Trichlormethiazide and potassium
    C03AB07 Cyclopenthiazide and potassium
    C03AB08 Methyclothiazide and potassium
    C03AB09 Cyclothiazide and potassium

### C03AH Thiazides, combinations with psycholeptics and/or analgesics

    C03AH01 Chlorothiazide, combinations
    C03AH02 Hydroflumethiazide, combinations

### C03AX Thiazides, combinations with other drugs

    C03AX01 Hydrochlorothiazide, combinations

## C03B Low-ceiling diuretics, excluding thiazides
### C03BA Sulfonamides, plain

    C03BA02 Quinethazone
    C03BA03 Clopamide
    C03BA04 Chlortalidone
    C03BA05 Mefruside
    C03BA07 Clofenamide
    C03BA08 Metolazone
    C03BA09 Meticrane
    C03BA10 Xipamide
    C03BA11 Indapamide
    C03BA12 Clorexolone
    C03BA13 Fenquizone
    C03BA82 Clorexolone, combinations with psycholeptics

### C03BB Sulfonamides and potassium in combination

    C03BB02 Quinethazone and potassium
    C03BB03 Clopamide and potassium
    C03BB04 Chlortalidone and potassium
    C03BB05 Mefruside and potassium
    C03BB07 Clofenamide and potassium

### C03BC Mercurial diuretics

    C03BC01 Mersalyl

### C03BD Xanthine derivatives

    C03BD01 Theobromine

### C03BX Other low-ceiling diuretics

    C03BX03 Cicletanine

## C03C High-ceiling diuretics
### C03CA Sulfonamides, plain

    C03CA01 Furosemide
    C03CA02 Bumetanide
    C03CA03 Piretanide
    C03CA04 Torasemide

### C03CB Sulfonamides and potassium in combination

    C03CB01 Furosemide and potassium
    C03CB02 Bumetanide and potassium

### C03CC Aryloxyacetic acid derivatives

    C03CC01 Etacrynic acid
    C03CC02 Tienilic acid

### C03CD Pyrazolone derivatives

    C03CD01 Muzolimine

### C03CX Other high-ceiling diuretics

    C03CX01 Etozolin

## C03D Aldosterone antagonists and other potassium-sparing agents
### C03DA Aldosterone antagonists

    C03DA01 Spironolactone
    C03DA02 Potassium canrenoate
    C03DA03 Canrenone
    C03DA04 Eplerenone
    C03DA05 Finerenone

### C03DB Other potassium-sparing agents

    C03DB01 Amiloride
    C03DB02 Triamterene

## C03E Diuretics and potassium-sparing agents in combination
### C03EA Low-ceiling diuretics and potassium-sparing agents

    C03EA01 Hydrochlorothiazide and potassium-sparing agents
    C03EA02 Trichlormethiazide and potassium-sparing agents
    C03EA03 Epitizide and potassium-sparing agents
    C03EA04 Altizide and potassium-sparing agents
    C03EA05 Mebutizide and potassium-sparing agents
    C03EA06 Chlortalidone and potassium-sparing agents
    C03EA07 Cyclopenthiazide and potassium-sparing agents
    C03EA12 Metolazone and potassium-sparing agents
    C03EA13 Bendroflumethiazide and potassium-sparing agents
    C03EA14 Butizide and potassium-sparing agents

### C03EB High-ceiling diuretics and potassium-sparing agents

    C03EB01 Furosemide and potassium-sparing agents
    C03EB02 Bumetanide and potassium-sparing agents

## C03X Other diuretics
### C03XA Vasopressin antagonists

    C03XA01 Tolvaptan
    C03XA02 Conivaptan