Hello and welcome to Healthcare Magic. Thanks for your query.
I understand your distress regarding your son's problems. Bipolar disorder
is an episodic mental illness which can be controlled with mood stabilizing medication. However, there is a high chance of relapse if medication is discontinued or not taken properly. Excessive alcohol intake can definitely cause mood changes and trigger a relapse.
Generally, if a person's psychiatric illness is well controlled with medication and he is symptom-free, then he should be able to continue his job and function normally. However, certain high-demanding jobs may have specific criteria for the recruitment of employees and these criteria vary between different organizations and countries. So, please clarify this with his employer.
Wish you all the best.
Dr. Jonas Sundarakumar