Loss of consciousness, confusion, or drowsiness
Low breathing rate or drop in blood pressure
Convulsions
Fracture in the skull or face, facial bruising, swelling at the site of the injury, or scalp wound
Fluid drainage from nose, mouth, or ears (may be clear or bloody)
Severe headache
Initial improvement followed by worsening symptoms
Irritability (especially in children), personality changes, or unusual behavior
Restlessness, clumsiness, lack of coordination
Slurred speech or blurred vision
Inability to move one or more limbs
Stiff neck or vomiting
Pupil changes
Inability to hear, see, taste, or smell
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