Lasix (furosemide) is a prescription medicine specially intended for patients diagnosed with high blood pressure. This water pill can also be used to treat fluid retention. While taking Lasix it will be easier for you to get dehydrated. Make sure you always follow all the dietary recommendations of your health care provider - for instance, you will most probably need to get enough salt and potassium in your everyday diet. Follow all the recommendations of your health care provider and make sure you take Lasix regularly. If you missed a dose, never take a double dose to make up for the one you missed, as an overdose is possible. The following symptoms may indicate an overdose: feeling light-headed, fainting, loss of appetite, weakness, confusion, ringing in the ears, and dizziness. Seek emergency medical help if you think you may have taken too much of Lasix. Tell your doctor about any drugs you are using, especially diet pills, salicylates, steroids, lithium, cold medicines, other blood pressure medications, digoxin, ethacrynic acid, or indomethacin, as interactions have been reported. Do not share this medicine with other people even if you think they have similar symptoms.