Did he quit Suboxone cold turkey? If so from how many mg daily? Quitting Suboxone from anything higher than 1mg daily is too much (in my humble opinion). Suboxone has a half-life of 37 hours, meaning it takes 37 hours before half the medicine is gone from your blood, so that is why it takes about 3 or 4 days for the withdrawal to really kick in.
Most people that wean from Suboxone do it over many weeks. I have a reader that was taking 16mg Suboxone for 2 months and his doctor let him taper like this even though his doctor laughed at him and said that anything below 1mg is in his head. If doctor is nice enough to prescribe some Klonopin or long lasting Benzodiazepine during the taper process it would help with sleeping, but slow taper is the "key"
Taper Week 1 = 14mg daily (1 3/4 of 8mg film)
Taper Week 2 = 12mg daily (1 1/2 of 8mg film)
Taper Week 3 & 4 = 8mg daily
Taper Week 5 & 6 = 6mg daily (3/4 of 8mg film)
Taper Week 7 & 8 = 4mg daily ( 1/2 of 8mg film)
Taper Week 9 & 10 = 2mg daily (1/4 of 8mg film)
Taper Week 11 & 12 = 1mg daily (1/8 of 8mg film)
Taper Week 13 &-14 = .5mg daily (1/16 of 8mg film)
Taper Week 15 & 16 = .25mg daily (1/32nd of 8mg film use razor or scissors)
Taper Week 17 & 18 = .25mg daily every other day
Taper Week 19 & 20 = .25mg daily every third day
*some people still get withdrawal from .25 and they slice .125mg (1/64th of a 8mg Film, super hard to cut that small) but cold turkey from .25mg is usually low enough to avoid bad withdrawals.
** always give a dose at least 2 hours after taking before deciding if it worked or not especially very low doses.
** I am not a doctor, this is for entertainment purposes only!