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marcy costa,   Thanks for your question.   Lasix is a diuretic that promotes the loss of water, salts, and minerals through the kidneys.  This includes potassium, which many patients' systems can compensate for.  But many patients are unable to keep up with this loss and require supplementation with potassium.  Of course, the higher the dose of lasix, the greater the chance of developing a low potassium level.   I suggest you increase your intake of potassium by consuming more citrus fruits, tomatoes, bananas, and potatoes.  As far as potassium pills are concerned, I would not use these unless blood tests show a low level of potassium.  Too much potassium is as dangerous as too little potassium.  Be sure to discuss this with your physician on your next visit.    I hope this has been helpful.  Best wishes.   Martin Cane, M.D.