[The doctor smiles reassuringly at him and gestures for him to follow her, in through the double doors that he had been barred from earlier and then towards a lift.]

We managed to get your brother stabilised, and he regained consciousness about fifteen minutes ago. He's a little drowsy, but he should be fine to go in the morning.

[Better than many outcomes this night could have had, there's no point worrying him with how close Sherlock came to slipping away.]

We've got some literature about drug addiction and services available for helping if you want them, both for the user and family members trying to support them through it.