Conversation so far:
where is the vagus nerve located and what effect does stimulation of nerve have on the patient
The vagus nerve arises from the medulla and projects connections to other locations on the central nervous system. Vagus nerve stimulation treats drug-resistant epilepsy and treatment-resistant depression.
what are the side effects of vagus nerve stimulation
The adverse effects of vagus nerve stimulation include cardiac arrest, bradycardia, voice altercation and hoarseness, cough, shortness, a tingling sensation, nausea, headache, difficulty swallowing, and sleepiness.

Question: what is the mecanism of action
Self-contained rewrite: what is the mechanism of action for vagus nerve stimulation