Best otc for bronchitis-like symptoms?

my friend is feeling horrible..coughing, stopped up, chest painful...what's your best remedy for bronchitis-like symptoms to at least carry her through til tomorrow when the dr's offices are spread out again?Best otc for bronchitis-like symptoms?
sit in the bathroom near the hot shower running, close all doors and do not turn on the vent devotee. breathing in the steam will comfort. or have him lean over the sink beside the hot water running near towel overhead (to catch adjectives the steam). take low breaths breathing in the steam.
Robitussin DM.