How do comas work that are caused by an overdose on drugs?

Nonetheless, the most common sort of coma induced by drugs (other then medically induced coma, which is actually a form of prolonged anesthesia) are caused by anoxic/hypoxic brain injury, which is caused by(lack of/decrease of) blood flow to the brain. Such brain injury definitely induces a "real" coma. read more

Coma can be caused by toxins like alcohol, or a brain trauma (injury). It is frequently related to the circulatory system - the brain may not be getting oxygen, or there is low blood sugar. Treatment is to help support life functions. Comas related to drugs or toxins have a high rate of recovery. read more

This is a brain condition caused by total lack of oxygen to the brain. Lack of oxygen for a few minutes causes cell death to brain tissues. Anoxic brain injury may result from heart attack (cardiac arrest), head injury or trauma, drowning, drug overdose, or poisoning. Persistent vegetative state. This is a state of severe unconsciousness. read more