Post Surgery, My Husband Was Prescribed Demerol And Phenergan 25

Post surgery, my husband was prescribed Demerol and Phenergan 25 mg (one tab every 6 hours, for the latter). We are out of Demerol but still have the Hydrocodon-Acetaminoph 7.5-325 tablets left. Can he take the Phenergan with the Hydrocodon? The Phenergan helps augment the Demerol medication, but we do not know about the Hyrdorcodon. We will see the doc tomorrow afternoon, but don't want to take the meds wrong in the meantime.