Drug precipitation within i.v. tubing: a potential hazard of chemotherapy administration.

Because relatively undiluted concentrations of drugs are maintained for prolonged periods in the Y-side arm of rapidly flowing iv infusions, we visually determined compatibilities of ten commonly used cancer chemotherapy drugs and four adjunctive drugs including droperidol, metoclopramide, furosemide, and heparin. Droperidol was found to be incompatible with furosemide, methotrexate, leucovorin, heparin, and 5-FU. Furosemide was incompatible with metoclopramide, doxorubicin, vincristine, and vinblastine in addition to droperidol. Doxorubicin was incompatible with heparin. If these drugs were administered sequentially into the Y-side arm of an iv infusion, precipitation would be expected with drug inactivation and possible drug embolization to the pulmonary circulation. Flushing the Y-side arm with a compatible solution after drug administration will prevent this problem.