Lasix (furosemide) is a loop diuretic used for patients diagnosed with fluid retention. Such patients are also often diagnosed with congestive heart failure, kidney disorder or liver disease. It is also often prescribed to treat high blood pressure and in that case may need to be taken for the rest of one's life. Before you start taking Lasix, talking to your health care provider is recommended. You need to discuss your current health condition and any medications you are taking at the moment. If you ever had an allergy to Lasix, you may not be allowed to take it because of high risk of the same reaction taking place. Pregnant of breastfeeding women are also not supposed to be taking this drug without previously discussing it with their doctor. Make sure you let your health care provider know if you are currently taking or intend to take any of the following medications: cold medicines, diet pills, lithium, ethacrynic acid, netilmicin, steroids, digoxin, amikacin, indomethacin, other blood pressure medications, salicylates, or streptomycin. Such health conditions as kidney disease, liver disease, lupus, gout, diabetes, or an allergy to sulfa drugs may also prevent you from taking Lasix safely. A dose adjustment may help, but your doctor will need to monitor you for serious side effects anyway. The following serious side effects are sometimes reported by patients taking Lasix: hearing loss, nausea, restlessness, easy bruising or bleeding, muscle weakness, dry mouth, unusual weakness, fast or uneven heartbeat, muscle pain, light-headedness, vomiting, peeling skin, rash, and blistering. However, you are more likely to get just a few mild side effects, such as headache, stomach pain, blurred vision, diarrhea, dizziness, burning, pain, numbness, and constipation. The mild side effects mentioned do not need to be reported to your health care provider, as they are most likely to go away on their own without any need for your doctor's interference. This drug is not supposed to be taken by pregnant or breastfeeding women as there is a risk Lasix will be excreted into breast milk and will affect the health of an unborn baby. Make sure you always use a reliable method of birth control and talk to your doctor as soon as possible if you think you may have become pregnant while using Lasix.