Lugol's solution is available in different potencies of 1%, 2%, or 5% iodine. The 5% solution consists of 5% (wt/v) iodine (I 2) and 10% (wt/v) potassium iodide (KI) mixed in distilled water and has a total iodine content of 126.5 mg/mL. The 5% solution thus has a total iodine content of 6.3 mg per drop of 0.05 mL; the 2% solution has 2.5 mg total iodine content per drop.