Yes, water pills are prescribed by physicians for weight loss treatment. you should also keep in mind that it is a temporary and emergency solution for certain medical conditions and not for weight loss treatment as it comes with severe side effects.. One of the fastest ways to lose water weight is to reduce sodium in your diet since too much salt can cause water retention. to further help balance fluids in the body, eat more potassium-rich foods such as bananas, carrots, and lentils.. Water pills, a.k.a. diuretics, have long been touted as weight loss wonders. get the facts on water pills and see if they may benefit you. water pills, a.k.a. diuretics, have long been touted as weight loss wonders. should you take water pills for weight loss? taking water pills without a doctor's supervision may cause dangerous side.