Gee, that's a good question. If your doc is familiar with the mechanism of LDN, it would be worth asking about taking the two at the same time.
You might also check with one of the following LDN info websites:

The Low Dose Naltrexone Homepage
http://www.lowdosenaltrexone.org/

LDN Research Trust : LDN Research Trust
http://www.ldnresearchtrust.org/

With love, Erika