How Can Side Effects Of Parkitidin Be Treated?

Hello Doctor, Its with real pain that i write this letter to you. My father was suffering from constipation, however he was also advised to meet a neurodoc, as well. After an MRI scan they found a minor clot on his brain and so concluded that it was due to his long term diabetis and age. So he was given ecospirin tablets to dissolve the clot. The problem is that he was also given parkitidin which really has an adverse effect on him. Now he s suffering from excessive weight loss, general weakness, insomnia and painful contractions on his body. He really didnt have these problems before and there was no problems for any movement. Now we ve stopped the tablet as per the doctor s advice. Now i need to know what other alternative medicine can be given to him to neutralize the bad effect of parkitidin ?