^ They need very high doses of narcan to reverse suboxone withdrawal since the suboxone has a higher affinity to the receptors, which is why I said they would have to tell the emergency services that's what he took. However, suboxone overdose is not likely when suboxone is the only drug taken, especially at a low dose of 2mg.
Looks like he is going to miss work. The half-life of suboxone is very long, so if he is that messed up right now, he won't be much better until probably close to 24 hours after he took it. The first time I took suboxone I couldn't even drive the next morning, so he should be prepared to call in sick.
Is he ok? Well, did he take any drugs other than suboxone? Suboxone itself isn't as bad as other opiates in terms of the amount of respiratory depression, but if he mixed it with other CNS depressants (alcohol, benzos, etc) then it is a lot more dangerous. Monitor his breathing while he's sleeping, and if it gets too shallow and/or his color gets bad then call an ambulance and tell them exactly what he took.
Is there anything you can do to make it stop? No. Like I said, it has a very long half-life (37 hours on avg) so time will be the only thing that will help.