Does Amiodarone Cause Lethargy?

My mother has Parkinsons and dementia.. She recently had a fall and broke her hip. while in rehab after the surgery on her hip, she suffered ventricle arrthemyia due to blood clots breaking away in her legs and going into her lungs.. she was inactive after the surgery and she is 84 years old.. So it resulted in two pulmonary embolisms in her lungs.. While in hospital she experienced an a-fib attack but they put her on amiodarone to put her back into synus. She is being given 200 mg twice a day.. I read though that this drug can cause lethargy, confusion, and weakness in elderly patients.. what other drug can she take that would be safer and not cause the lethargy, weakness, and confusion but still keep her from getting a-fib.??. And what drug would be safer for her Parkinsons??