kidney disorders Patients should consult their physician before taking any additional prescriptions, over-the-counter medications or nutritional supplements. Other substances that can influence the effects of diuretics include the following: Thus, diuretic herbs are not yet well supported for use in reducing oedema. , Difficult or painful urination Nausea or vomiting , Unusual bleeding or bruising Most potassium-sparing diuretics are far less potent than loop or thiazide diuretics. , causes of water retention waterfall supplement