Ethyl chloride spray is used as a fast-acting local anesthetic to reduce pain during minor medical procedures such as needle insertion, blood draws, or minor surgical sutures. It is also used to relieve muscle spasms and provide temporary pain relief. The spray works by rapidly cooling the skin, which numbs the sensory nerves in the targeted area. The patient feels intense cold, followed by local anesthesia within seconds. The effect lasts for a short period. Ethyl chloride should be used with caution and should not be sprayed on open wounds or the eyes. It is also not recommended for repeated use or over large areas of the skin to avoid irritation or toxicity. It should be used under medical supervision to determine the need, dosage, and appropriate method for each case.