I am a 63 years old male. I am having migraine headache for the past 10 years. Whenever I get migraine headache, I have the symptom of a zigzag pattern kind of a ring starts from the pupil of my eye. Initially it starts as a small circle which grows bigger and bigger. During this time, the vision is blur and even sometime the vision will disappear. So, I can easily know that, right after that symptom, I get a heavy headache which will break my head and that will go for 2 to 3 days. When I went to doctor for the first time, doctor said that, it is migraine headache and I need to use Inderal 40 mg. I continuously used it for 7 years. After that, I have reduced it to 20 mg. Since I am using for the past 10 years, I am not sure whether there are any side effects by this. Also, is there any other treatment that can solve my migraine problem?