Chemically induced hepatitis?

One of the things included in this morning's blood tests is a liver panel - his liver enzymes were slightly elevated at his first blood test on the 18th of Dec, and then more so when he was in the emergency room on Jan 1.  His doctor told him he suspects chemically induced hepatitis. I'm assuming that's from all the drugs he's been on - I wonder if he'll need to go off the Toprol?   And if so, then what will they use to lower his blood pressure?  Guess we'll find out next week.