Diuretics

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Commonly used cardiac drugs. They 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. And they can gain calcium, causing hypercalcaemia.

Potassium-sparing

Spironolactone. Seems to be pretty awesome. Gains K+ so hyperkalaemia is a potential side-effect. Works by inhibiting aldosterone.