When to start an anticholinergic on Haldol?

Hi, So I'm trying to find literature to support starting Benztropine on a young guy in his 20's who is on Haldol. My attending is against it, however, I am truly concerned about him having EPS symptoms. We are only doing Haldol 5 mg BID, but will plan on doing Decanoate later on as we uptaper the dose. If anyone has any guidelines they have for this, I'd love to hear them. Also, for Risperdal and Atypicals like Zyprexa, do you guys typically do Benztropine? My logic is, he is young and... When to start an anticholinergic on Haldol?
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