Its like this, Lasix is not potassium sparring which means you loose your water wt very quickly along with all the potassium in your body. This has accounted for many of the top Olympians who have dropped dead after a big show from a massive heart attack. Your heart has to have potassium in order to work correctly. Aldactone is potassium sparring which means it is much safer. Less cramps from not having a depleated potassium level and will not cause your heart to explode unexpectedly.
Best advice is that lasix is a hardcore dieuretic. ONLY take it if you know what you're doing. It is kind of like insulin. Even a fraction too much can kill you on the spot. Is that clear enough?