Dns Solution consists of purified salt solution. It is used for short term fluid replacement. Thus, it treats hypovolemia that can result due to any dehydration, or injury. It helps to restore the salt and electrolyte levels in the body. Dns Solution works by replenishing salt and electrolyte levels in the body. This injection must be administered under the supervision of a healthcare professional. You should not take it, if you have any known allergy from this injection. Your doctor may check your blood pressure and ask you to get regular blood tests done while you are using this injection.