Thanks for your feedback.
Topiramate is frequently combined with other antipsychotic drugs sometimes to attenuate the weight gain caused by other drugs and you can search about this fact on internet and BNF
You have mentioned that you are suffering from Borderline personality disorder
and taking Seroquel. Is it mentioned in BNF that Seroquel is indicated specifically for Borderline PD?
You may also ask that Mood stabilizers such as Sodium Valproate, Carbamazepine / Oxcarbamazepine,Topiramate, Levitracetam, Zonisamide, Gapapentin, Pregabalin are all specifically categorized as anti seizure drugs than why they are used for mood disorders, anxiety
disorder, sleep problems , psychosis
Ziprasidone and Aripiprazole are the drugs which have very less weight gaining tendency when compared to other available antipsychotics, but still any one of them could cause weight gain as it depends on individual patient profile. There are several side effects of any particular drug, which may or may not happen in any individual patient!
There are some antidepressants which do not cause weight gain such as Fluoxetine and Bupropion, but in mood stabilizer category I guess there are not many options left, other that what you have already tried.
For Borderline personality disorder, drugs are used only to control certain symptoms which may interfere with patients functioning and thats all. As such, no drug is specifically useful for its treatment. Your psychiatrist may try several options including that of antidepressants, antipsychotics, mood stabilizers, and anti anxiety drugs and all this will be a trial and error process.
I would suggest you to discuss with your treating doctor about the option of Psychotherapy specially Dialectical Behavior Therapy along with the medicines in your case.Dialectical behaviour therapy for borderline personality disorder
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