Sorry about your son Mom, the answer is maybe, a side effect listed is: anticoagulant effects may be increased, especially during first 2 wk.
http://www.drugs.com/ppa/chloral-hydrate.html
I would ask the pharmacy for the Chloral Hydrate monograph (product insert sheetlet from the pharms master bottle) they will give it to you if you ask, this is what has all the best info. you may be able to find it on-line, either Google or go to the Mfr's website.
Good luck
Cats