Symptoms of too much sodium (salt) in the body Convulsions (seizures) dizziness fast heartbeat high blood pressure irritability muscle twitching restlessness swelling of feet or lower legs weakness Symptoms of too much fluid in the body Puffy eyelids Some electrolyte replacement solutions side effects may not need any medical attention. As your body gets used to the medicine these side effects may disappear. Your health care professional may be able to help you prevent or reduce these side effects, but do check with them if any of the following side effects continue, or if you are concerned about them: More common Vomiting (mild)