Dimethicone 5cst manufacturer introduces the first aid measures for accidentally entering Dimethicone 5cst :

Skin contact: Take off contaminated clothing and wash skin thoroughly with soap and water.
Eye contact: lift the eyelid and rinse with running water or normal saline. Seek medical attention.
Inhalation: quickly leave the scene to a place with fresh air. Keep the airway open. If breathing is difficult, give oxygen. If breathing stops, give artificial respiration immediately. Seek medical attention.
Ingestion: Drink enough warm water to induce vomiting. Seek medical attention.