Lasix® (furosemide), a blood pressure medicine, belongs to a class of drugs known as diuretics (commonly referred to as "water pills"). It works by increasing the amount of salt and water that the kidneys remove from the blood, which is then passed out through the urine. This action causes a decrease in blood volume. Because of this effect, Lasix can lower blood pressure and help with water retention.
Lasix comes in tablet form and is usually taken by mouth once or twice a day. Because it increases urination, it is best to take it in the morning to avoid getting up to use the bathroom throughout the night. If you take this medicine multiple times per day, it is best to take your last dose of the day before 6 p.m., unless you are instructed otherwise.
As with any medication, side effects are possible with Lasix. Commonly reported ones include:
Low blood potassium levels (hypokalemia) or other electrolyte imbalances
Upset stomach (nausea) or vomiting
Sensitivity to the sun.
(Click Lasix for more information about this blood pressure medicine, including details about its specific effects, dosing guidelines, and warnings.)
Written by/reviewed by: Kristi Monson, PharmD;Arthur Schoenstadt, MD
Food and Drug Administration, Center for Drug Evaluation and Research. Electronic orange book: approved drug products with therapeutic equivalence evaluations. FDA Web site. Available at: http://www.fda.gov/cder/ob/. Accessed March 8, 2007.
Briggs GG, Freeman RK, Yaffe SJ. Drugs in Pregnancy and Lactation. 7th ed. Philadelphia (PA): Lippincott Williams & Wilkins;2005.
National Library of Medicine (US). Drugs and Lactation Database (LactMED). NLM Web site. Available at: http://toxnet.nlm.nih.gov/cgi-bin/sis/htmlgen?LACT. Accessed March 8, 2007.
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