DRUG INTERACTIONS
In Study 5, the mean serum trough concentration of trastuzumab was consistently elevated approximately 1.5–fold, when administered in combination with paclitaxel as compared to trough concentrations of trastuzumab when administered in combination with an anthracycline and cyclophosphamide.
In other pharmacokinetic studies, where Herceptin was administered in combination with paclitaxel, docetaxel, carboplatin, or doxorubicin, Herceptin did not alter the plasma concentrations of these chemotherapeutic agents, or the metabolites that were analyzed. In a drug interaction substudy conducted in patients in Study 7, the pharmacokinetics of cisplatin, capecitabine and their metabolites were not altered when administered in combination with Herceptin.
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