Stiffness & tremors. Any side effects?

Dear Doctor, my Dad 69 years old , met with an accident 7 years ago and had 2 major (right foot) surgeries ( spiral fracture). After that there was a slight shivering on his rt. foot but it stopped as he recovered. His movement become slow. Now since 7 months after taking ayurveda he had developed these given symptoms: - shivering in both hands. - stiffness in legs. - locking of muscles while walking due to which he fell four times. - shivering of hands and legs while at rest. He has been suggested to take Tab Propranolol ( Indiral) twice a day and, Tab. B complex once a day and physiotherapy. I wish to know is it safe for him to take Tab Propranolol ( Inderal) 20mg and what effect will it have on him. Does it has any side effects? Anything else you may suggest for his condition. Pls guide!