I'm taking cabergoline for a pituitary tumor and...?

I am sorry I don't know the answer to your question, but if you are seeing an endocrinologist, please call him or her before taking the L-Lysine. I had a pituitary tumor back in 1971 and back in those days, the only way to treat me was a bilateral adrenalectomy. I have to take cortisone, but have done pretty well since. I am going to star your question as I would like to hear how you are doing.