May I suggest that I often did the following instead of using drugs, herbal or otherwise,for new dog stress.
If he is in a crate with a blanket perhaps a small cheap wind up clock with a loud tick tock might help.
Congratulations again to Ds & Ddil- hurrah for working so hard to adopt Frankie.
Prayers that the adjustment period is short lived. Candle for Frankie that he has a long and happy life with his new family.
Congrats grandma Plum lolol
Love All Life, Thank You For Posting! :)