Hi Mary Ann, Thanks a lot for your reply. Instead of Sinemet, my father's physician now advises him to take carbidopa & levedopa 25/100 mg(3 tablets a day).I have asked my mother to take blood pressure of my father at various time of a day like your suggestion. One thing I'm so worried about is that it's unpredictable when my father is going to be unconscious. It can happen at anytime of a day. It didn't only happen when he was sitting but also when he is moving. He said, suddenly he felt like asleep and he backout for about 15 minutes. Some people suggested that this symptom could be caused by the side effects of other drugs, but beside carbidopa & levedopa, my father doesn't take any other drugs. My father physician in Vietnam has no idea about my father symptom so I feel so hopeless. If anybody knows anything about this symptom, please respond. I really appreciate it. Yen > > My father usually becomes unconscious when he is sitting in a position >for a while, not when he is standing up or sitting down. He has asked his >physician in Vietnam, but the physician has no idea what's going on with my >father. He still advise my father to take Sinemet 25/100 mg, 3 tablet a >day. >Mary Ann wrote, Yen, I'm sorry to hear about your father's continued problems. It would seem that, for some reason, his blood pressure is very, very low. Sinemet can cause such difficulties - but so can a variety of other problems,including undiagnosed heart and heart valve diseases. I'm wondering if your father would do better on a lower dose of Sinemet - like half a tablet. Ask his neurologist if such a switch in treatment is advisable. In the meantime, it would be beneficial to know what your father's blood pressure is at various times of the day - and whether a drop in blood pressure is related to when he takes Sinemet. Is it possible for someone to take his blood pressure. >----- >God bless >Mary Ann ________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com