If a heroin overdose is the reason for unconsciousness, Naloxone can be given to reverse it. Someone with a subdural hematoma may need brain surgery. An individual with an infection may need antibiotics. Side effects depend on the treatments used. For example, antibiotics may cause allergic reactions or stomach upset.
Surgery carries a risk of bleeding, infection, and allergic reaction to the anesthesia .
After fainting, the individual usually needs no further treatment or monitoring. Further treatment may or may not be needed for other conditions. For example, a person with serious kidney disease, liver disease , or diabetes usually needs lifelong monitoring and treatment. A person who faints may receive a few tests to make sure there is not a serious cause. He or she may be observed for a brief period and then sent home.