I don't think you can develop bipolar illness from taking antipsychotic meds. However, they can cause you to develop other worrisome symptoms, such as extrapyramidal disorders (think of people with Parkinson's). What meds was he giving her? I have not kept up with all the details. There are a bazillion antipsychotic medications out there, many of them misused and prescribed. Presumably, though, it would be difficult to get actual antipsychotics for BPM without a physician - was he perhaps just giving her things like valium or xanax?