For any drug product or diluent that is intended for use as an additive to another drug product, the potential for incompatibility exists.
In such cases, the drug product labeled to be administered by addition to another drug product (e.g. parenterals, inhalation solutions), should be evaluated for stability and compatibility in admixture with the other drug products or with diluents both in upright and in inverted/on-the side orientations, if warranted.