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Ringer's lactate solution (RL), also known as sodium lactate solution and Hartmann's solution, is a mixture of sodium chloride, sodium lactate, potassium chloride, and calcium chloride in water. It is used for replacing fluids and electrolytes in those who have low blood volume or low blood pressure. It may also be used to treat metabolic acidosis and to wash the eye following a chemical burn. It is given by injection into a vein or applied to the affected area.Side effects may include allergic reactions, high blood potassium, volume overload, and high blood calcium. It may not be suitable for mixing with certain medications and some recommend against use in the same infusion as a blood transfusion. Ringer's lactate solution has a lower rate of acidosis as compared with normal saline. Use is generally safe in pregnancy and breastfeeding. Ringer's lactate solution is in the crystalloid family of medication. It has the same tonicity as blood.Ringer's solution was invented in the 1880s with lactate being added in the 1930s. It is on the World Health Organization's List of Essential Medicines, the safest and most effective medicines needed in a health system. Lactated Ringer's is available as a generic medication. The wholesale cost in the developing world is about US$0.60 to US$2.30 per liter. For people with poor liver function, Ringer's acetate may be a better alternative with the lactate replaced by acetate. In Scandinavia Ringer's acetate is typically used.

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