Diuretics are substances that increase the removal of fluids from the body through urination. In short diuretics augment or increase the urine output. Diuretics are usually considered the first line of treatment for hypertension. Also it is prescribed for edema where there is excess accumulation or retention of fluid in body tissues. Diuretics have been misused as a weight loss aid. Diuretics cause fluid loss and not the fat. Along with fluid loss there is loss of electrolytes thus, can lead to serious imbalance of electrolyte in the body and can cause dehydration, kidney failure, faintness, dizziness, muscle cramps, headaches and nausea. In worst cases can even lead to death, cardiac arrhythmias, hypotension etc. long term diuretic use may cause an increase in serum cholesterol and thus an increased risk of arteriosclerosis, including coronary artery disease. Thus unless prescribed it can be dangerous and fetal.