I'm working on my own guide to the use of loperamide in suppressing the symptoms of opiate withdrawal. There are a lot of opinions out there, many of which are based on hearsay. I have several research papers that I will put up so people can look to the science. In the meantime check out the following, which is among the best summaries available, better than looking to forums. In the meantime check out the chemical structures below, notice how loperamide looks like a cross between methadone and fentanyl?
The Merits of High Dose Loperamide for Opioid Withdrawal
Loperamide In Opioid Withdrawal