1. Poisoning reaction. Borneo is a prescription drug and the dosage must be strictly controlled. When borneol is used in excess, it can cause poisoning. Vomiting, diarrhea, and loss of consciousness. Severe cases may cause respiratory failure and death.

2. Allergic reaction. Borneol is an allergen. There are people who are allergic to borneol. There will be wind clots and itching of the vaginal lips. Shortness of breath, palpitation and other symptoms.