If two IV meds are incompatible, what should you do?

• A. Do not mix; administer separately via different lines and flush between if needed
• B. Mix the meds together before administration
• C. Push one after the other without separate line
• D. Stop the infusion and restart later

Answer: (A)

When two IV medications are incompatible, they must not share the same line or bag. The safest approach is to administer them separately, using different IV lines or ports, and flush the line with an appropriate solution between administrations. This keeps the drugs physically and chemically separate, preventing reactions, precipitation, or loss of potency that could harm the patient. After giving the first drug, flush the line to clear it before starting the second medication.

Mixing them together in the same line is not appropriate because incompatibility can cause harmful interactions. Administering one after the other through the same line without a separate line risks cross-mixing. Stopping the infusion and restarting later isn’t necessary when you can safely use separate lines and a flush between administrations.