Has anyone ever gone o their T or psychiatrist to ask advice on behalf of a friend?

A dear friend of mine is married to a man who is bipolar and who, forthe last 8 years has been managing his illness pretty well. When she first found out it was through his family- he never told her he was bipolar before they married. When she became pregnant with their first child his behavior gradually changed, he stopped sleeping and was verbally abusive. Nothing like his usual self. He took risks, got into debt....it was strange. She finally called his mother since she was on the verge of leaving. Long story short his mom asked if he was taking his meds and my friend was like "what meds???". She confronted him, he got treatment and he doctor kept my friend in the loop (with H's permission). When things started to go downhill and her husband got nasty she could contact the doctor and her husband was ok with it and he would comply with treatment. Now he has a new pdoc and is still on meds, but he only sees the
doctor once or twice a year. He has started drinking a lot of beer, has stopped sleeping much and is getting increasingly nasty with her. She is afraid to confront her husband...shes very sweet and hates confrontation. Without the help of this other doctor she feels alone. I find it odd that the only treatment he gets is a pdoc visit twice a year. How can this doctor treat a patient with so little contact. He can't possibly know much about him or his symptoms. I want to help her but don't know enough since I'm not a professional. Has anyone ever one for this type of advice and how was it received by your T or pdoc?