I'm so sorry you are having such a hard time in your relationship, yet I'm glad you found us.
We "get it". I'm sure that your pwBPD (person with BPD) is totally serious when they tell you that a pill is "all it takes".
OK, we can help you but we're going to need some details to get you pointed in the right direction first.
Is there a formal diagnosis? What kind of medication? How long? Can you tell a difference?
Are either or both of you seeing a therapist?
Can you give us an example of something that "isn't working for you"?
Life will get better for you soon! Get ready..you have a lot to learn!
Best,
FF