Welcome to HCM
We understand your concerns
The question is not how to reduce the dose of medicines but how are you behaving after medication and before medication. In the first instance, borderline personality does not need to take medication. They need lifestyle change and mind streamlining.Consult a psychologist
/ psychotherapist who can help you in this matter and once you successfully achieve this, can ask your psyhiatrist to reduce the dose of medicine. I can help you as a psyhotherapist online if you desire so.