If your pdoc does blood level checks regularly you should be okay. In my opinion though only every three months is insufficient. My pdoc was going for months between checking blood levels and I became toxic. I had explosive diarrhea, vomiting and itching over my whole body. She had to admit me inpatient and my level was 2.9 (therapeutic level is 0.5-1.2). Many people do quite well on it though.