Diuretics

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Get rid of water and used in oedema (reduces excess water) and hypertension (reduces fluid and thus pressure in circulation).

Loop

Furosemide acts on a Na-K symporter (kicks out K+, reabsorbs Na+). Thus hypokalaemia is a side-effect

Thiazide

Bendroflumethiazide prevents Na+ reabsorption. Thus hyponatraemia is a side-effect.

Potassium-sparing

Spironolactone. Seems to be pretty awesome. Probably expensive or something.