Lasix (furosemide) is a medicine that belongs to the class of loop diuretics and can be used for the treatment of fluid retention and a number of other conditions as prescribed by your health care provider. You may be recommended to take Lasix regularly, or just once - everything depends on the condition you are being treated for (Lasix can be prescribed for conditions other than fluid retention, but it's up to your health care provider to decide whether it will be efficient for your case). Before you start taking this medication, make sure your health care provider knows that you have any of the following conditions: allergy to sulfa drugs, gout, liver disease, lupus, diabetes, or kidney disease, as they may affect the dose you will be prescribed. You may get dehydrated when taking Lasix, as this medicine will make you urinate more often. You will need to get enough potassium and salt in your diet - and this is something that needs to be discussed with your health care provider. Never combine Lasix with any of the following drugs before discussing this with your health care provider: salicylates, ethacrynic acid, steroids, gentamicin, netilmicin, cold medicine, digoxin, lithium, diet pills, streptomycin, blood pressure medications, indomethacin, and any other ones you may be taking at the moment. A combination of Lasix with the drugs mentioned above can cause unwanted side effects and lead to certain other health consequences you would rather avoid. Make sure you never start any new treatments while using Lasix and tell other doctor prescribing you some other medication that you are currently using this loop diuretic. You need to stop the treatment and consult your health care provider as soon as possible if you get any of the following serious side effects: restlessness, clay-colored stools, vomiting, jaundice, unusual weakness, nausea, muscle pain, easy bruising, peeling skin rash, drowsiness, dark urine, dry mouth, hearing loss, and loss of appetite. The serious side effects mentioned are not expected to go away on their own like mild side effects you can also get (burning, diarrhea, dizziness, constipation, blurred vision, stomach pain, headache, or tingly feeling), and should therefore be reported to your health care provider to make sure you get the medical advice and assistance you need. Taking more of Lasix is not recommend, as you can experience some overdose symptoms that will need to be reported to your local emergency center as soon as possible, such as fainting, lightheadedness, weakness, dizziness, ringing in your ears, confusion, and loss of appetite. If you happened to miss your dose of Lasix and have to take another one pretty soon, you can just skip the dose missed and go back to the regular dosing schedule. Try to avoid skipping doses too often, as this may result in lower efficiency of your treatment, which is especially dangerous if you are taking this medication for high blood pressure control. Make sure no one has access to this medicine and will abuse it.