Drug Interactions

Identify and describe two substances that can interact with H1 antagonist (blocker) antihistamines. Then, identify two substances that can interact with H2 antagonist (blocker) antihistamines.
After identifying substances that can interact with these two drugs, answer the following questions:

How would you educate a client on avoiding these potential drug interactions?
Explain the importance of educating your client.

Please support your response with at least two evidence-based sources.