The Client Receives H₂-Receptor Antagonists for Treatment of Peptic Ulcer

The client receives H₂-receptor antagonists for treatment of peptic ulcer disease (PUD) . Which assessment finding should be reported immediately to the physician?

A) The client reports he is constipated.
B) The client reports pain after 24 hours of treatment.
C) The client reports episodes of melena.
D) The client reports he took the antacid Tums with his H₂-receptor antagonist.