When you say BPD are you referring to borderline or bipolar? Because borderline is usually treated with therapy as the first-line treatment, while meds are defi

When you say BPD are you referring to borderline or bipolar? Because borderline is usually treated with therapy as the first-line treatment, while meds are definitely the norm and most effective for bipolar. OPs description of his friend ruining his life by not taking his meds seems more like bipolar.