Lasix (furosemide) can be prescribed if you have high blood pressure. You may need to be taking Lasix for the rest of your life. The liquid form is supposed to be measured with a special measuring device. If you don't have one - ask your pharmacist for it, as otherwise you may not measure the dose accurately. If you think this drug is not working, do not stop taking Lasix, especially if you are taking it for high blood pressure. Talk to your doctor first to make sure you do not need a dose adjustment that may do the trick. Report serious side effects of Lasix, such as dry mouth, muscle pain, yellowing of the skin or eyes, thirst, light-headedness, dark urine, peeling skin rash, hearing loss, clay-colored stools, easy bruising or bleeding, vomiting, drowsiness, urinating less than usual, uneven heartbeat, and other ones to your doctor right away. In most cases, however, you will get just a few mild side effects - and there is no need to report them. The following mild side effects are possible: thirst, blurred vision, dizziness, headache, confusion, constipation, weakness, muscle cramps, vomiting, and upset stomach. Throw away any unused Lasix past its expiration date and never share this drug with other people.