CYP1A2 inhibitor - Multiple interactions possible.
QTc prolongation - Increased risk with other agents that prolong QTc.
Divalent & trivalent cations including Al, Ca, Fe, Mg (antacids, dairy products, iron supplements, some enteral feeds) - Decreased absorption
Cyclosporine - Increased levels of cyclosporine
Warfarin - Increased INR
Methadone - Lowered seizure threshold