I know I'm a little late to this but maybe for next time or for somebody else.
I came across the below as a result of another bit of research for another thread. I've not seen it mentioned here (but I'll admit I've not UTFSE either before posting here).
Something called Lofexidine, sold under the brand name Lucemyra, and used to treat or, to a degree mitigate, opioid withdrawal symptoms.
en.wikipedia.org
Lucemyra (lofexidine) is used to treat opioid withdrawal symptoms. Includes Lucemyra side effects, interactions and indications.
www.drugs.com
Edit;
Never mind. I UTFSE and it's old news so far as I can tell.