Changed to Chasteberry decrease pergolide effects?

Joy V

"I would stop the Chastetree berry because there is always the potential for it to decrease pergolide effects."

Dr. Kellon, is this only a possibility or is it inevitable?  I ask because I recently added chasteberry to my horse's supplements (with a lovely, positive effect) but I don't want to screw up the effects of the Prascend.  His ACTH is very well controlled with one pill at this point (tested).  Thanks in advance for any info.

Joy and Willie (PPID/IR)
Nevada County, CA - 2019

Case history:
Willie's photo album:

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