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Drug incompatibility in IV therapy refers to physical or chemical interactions between drugs (or between a drug and the IV solution) given through the same IV line. These interactions can cause precipitation, reduced potency, or harmful reactions. To manage this, verify compatibility before administration using reliable references; if compatible, you can administer through the same line with a thorough flush between drugs. If incompatibility is present or uncertain, use separate IV lines or a dedicated line and flush between medications, and consider changing the diluent, concentration, or administration route as appropriate. Always monitor the IV site and patient for signs of problems, such as cloudiness, precipitate, color change, or adverse reactions, and document any incompatibility events.