8 mg should be fine for the first week to detox, then as Tom said, taper down, cut the pill in quarters and have your husband take 3/4 for a few days, then go do
half for about a week, then go to 1/4, and then 1/8 if
you can cut it that small. Once he gets down that, he should be at the end of the 21 days and he should be able to stop with minimal discomfort. The Clonidine will help with any withdrawal symptoms he may have once he completely stops the suboxone.