Based just on the facts you have stated, you should give him formal notice (meeting all the legal requirements for notice) and evict him if he doesn't leave when the notice period expires. Just being drug addicted does not necessarily meet the requirements for a restraining order, but you should go over all the facts during a consultation with an attorney. If there are not grounds for a restraining order now, you may need to wait until he comes back before applying for one.
Based just on the facts you have stated, you should give him formal notice (meeting all the legal requirements for notice) and evict him if he doesn't leave when the notice period expires. Just being drug addicted does not necessarily meet the requirements for a restraining order, but you should go over all the facts during a consultation with an attorney. If there are not grounds for a restraining order now, you may need to wait until he comes back before applying for one.