Camphor oil is refined from camphor resin, which is a colorless or light yellow to reddish brown oily liquid. In addition to insect repellent, but also with wound healing, deodorization and other functions, very widely used. The efficacy of camphor oil 1. Effects on the central nervous system Camphor can excite the central nervous system and improve respiration and circulation, especially when the central nervous system is in a state of inhibition. The main is due to subcutaneous injection time to stimulate the receptors caused by reflex excitement. 2. Effect on circulatory system In the isolated heart, excitatory effect can be seen only when failure is caused. For the vascular motor center, only when its function is extremely low, the party has an exciting effect, the visceral blood vessels shrink and the skin blood vessels are dilated, and the blood pressure rises. It has no effect on normal myocardium, but is inhibited by high concentration. So some people think that circulatory collapse or acute heart failure is effective; But others doubt or deny its efficacy. 3. Effect on gastric mucosa Camphor makes the stomach feel warm and comfortable. Large amounts can produce nausea and vomiting.