Six hundred mg a day for about 15 years. I had no adverse effects. I stopped taking it after a new doctor re-evaluated my symptoms and determined that other medications I was taking were adequate to treat my symptoms. I discontinued use without any problems. It's been six months now and I'm feeling better than ever- and I mean that in a healthy way and not as a trip into mania-land. 
The biggest pain with the drug is the blood work, and that's not really a problem if you don't mind getting blood taken a few times a year. At low doses there is probably a very minimal chance of running into complications with the drug. As mentioned above, with higher doses you have to watch out for toxicity, and you must submit to the blood work if you take the drug at all. It sounds like you are in good hands with your doctor from what you said in another post, and he or she should keep you out of harm's way when it comes to this drug.
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