It is five months already, relatively difficult to treat. Your treatment not remarkably effective is a normal condition.
According to me, his condition is also related to many factors, for instance, his age, constitution, whether complicated with other diseases and the treatment for those diseases or not, and so on. It is necessary for him to have a check to see if he has tumor or the facial paralysis is caused by Lyme disease.
If these secondary diseases can be excluded, I suggest, you observe if he has the channels stagnated in the local area, especially around the eye and ear and at the corner of mouth. If yes, the bleeding therapy can be applied.
TCM holds that the prolonged disease must have stagnation. The treating principle should be activating blood circulation and remove stasis.
If possible, the herbal medicines can be used.
What is more, the functional exercises should be combined. Teach him how to do facial massage by himself will be helpful for him.

Thank you for your help, Ocean. The patient’s facial paralysis is caused by herpes zoster.
Other causative factors can be excluded.
Vitamin B12 Injection for two weeks.
Through observation, he has channel stagnation around his mouth, but I am not sure about it. “The prolonged disease must have stagnation”, I really have heard it, makes sense very much. I planed to try the bleeding therapy. But the bleeding has any side effects or not? Thank you.