Final answer:
The nurse is using Compensation for adverse reactions to counteract the effect of the antibiotic by administering antihistamines.
Step-by-step explanation:
The nurse is using Compensation for adverse reactions to counteract the effect of the antibiotic.
Antihistamines are used to block the action of histamines, which are released by mast cells and cause the symptoms of hives and itching. By administering antihistamines, the nurse is compensating for the adverse reaction caused by the antibiotic.