One question (well maybe more after this one lol) if the medication turns them into Zombies and makes them forget things and be tired all the time, how do they even function or change their behavior other than just Zombie them out? How do they ever live a normal life? Does your cousin go to work? or is he on disability?
I think that the answers to these questions are very much dependent on the severity of the BPD and the amount / type of medication they are on. I can give 2 examples at opposite ends of the spectrum, because my roommate/ ex has milder BPD and only takes trileptal, and my cousin has severe BPD and is on a few medicines, topomax, lithium and I am not sure what else. I know he takes 3 or more things.
Roommate: Has never been hospitalized, but has been arrested for threatening behavior. He has never hurt anyone. He has had a very good union job for many years, makes a lot of money. He is very good at masking his condition in front of others, very good with people if he wants to be, and many people in his family don't even know he has BPD. They just know he was a very naughty kid, got into trouble a lot. When I met him he was taking 2 trileptal a day and was able to live by himself, go to work, had an immaculately clean apartment, well groomed, cook for himself, and have visits with his children/ take care of them. Basically, a normal life, and he seemed to have an offbeat personality. He is a good person. At 2 pills a day, he would be very tired by the end of the day and fell asleep by 9pm. If he had a beer, it would knock him out right away. He didn't regularly drink or smoke marijuana for that reason. On 1 or 1/2 pill trileptal + smoking Marijuana at least 2xs a day, he is still able to maintain a normal seeming life. Main difference is that he does not have an interest in relationships as much and does not care about things he used to.."can't be bothered". He can stay awake much later at night and has more energy. He also takes things a lot more personally and has more episodes of mania or depression. We got divorced at this stage. Once the alcohol gets added in, he loses control more and has more mania and anger problems. He is still able to reel himself in though, as he has been "behaving himself" for the most part ever since I said I would call the police a year ago. He forgets things a lot, and when he is drunk he can say mean things, and he cares even less for things / people. He is also less cooperative with doing things around the house.
Cousin: Has lived with his parents most of his life, except for a roommate in college and a girlfriend later on. Neither of those situations lasted more than 6 months and he had to go back home. He was able to get halfway through college and had to leave because of the BPD. Has never been able to have a job. He has tried to work part time several times, but always ends up having an episode after about a week. He also does not like to be around a lot of people at one time. He does socialize and has a lot of friends, but it has to be in small doses and when he is ready, or he gets overwhelmed. He has been hospitalized at least 6 times, but never institutionalized. My aunt is a nurse and she could have kept him home by claiming medical responsibility for him. Sadly, my cousin will never have what is called a "normal" life. He knows he wouldn't be able to handle having a wife and/ or children. Gladly, he seems okay with that. He would like to have a pet one day, but thinks he might neglect it at times, so he cannot. He has been on disability since he was almost 18, and will be for the rest of his life. The medicines that he takes make him very tired and he has to prioritize his activities in order to get necessary things done. He is often too tired to do what he wants to do. The medicines also seriously affect his memory, speech pattern, and he has a very hard time maintaining a healthy body weight regardless of dieting and exercise. He does not have problems cooperating with others or with anger, etc when he takes his medicines. He did use some alcohol and drugs in college. But after realizing that these things were accelerating his mental problems, he stopped and has not had any for over 20 years. He has a lot of problems finding the right combo of meds and frequently has episodes when they are not working for him or when he is changing meds. He has to be very careful to get enough sleep, and to eat on time, and to avoid too much stress. Otherwise, these things can push him over the edge...even on meds. He sees his psychiatrist and psychotherapist regularly.