Patented in 1959, Furosemide is used to treat fluid build-up due to heart failure, liver scarring, or kidney disease. This medication may also be used for the treatment of high blood pressure. Basically, Furosemide works by blocking the absorption of sodium, chloride, and water from the filtered fluid in the kidney tubules, causing a profound increase in the output of urine (diuresis). As for its common side effects, they include feeling lightheaded with standing, ringing in the ears, and sensitivity to light. There are also other side effects that are potentially serious such as electrolyte abnormalities, low blood pressure, and hearing loss. It is worth noting that blood tests are recommended regularly for those on treatment. Also bear in mind that Furosemide should be used with caution during pregnancy, and only if the expected benefit to the mother is greater than any possible risk to the developing baby.