B A L Injection is a chelating agent. It is helpful in removing the heavy metal toxicity (e.g., arsenic, gold or mercury) from the body. It is also used in combination with other drug (sodium calcium edetate) to treat lead poisoning. B A L Injection is given as an injection by your doctor or healthcare professional. It is given into muscle for 3 consecutive days. The dose will be given according to body weight and severity of the symptoms.