Paclitaxel and Trastuzumab interaction
Paclitaxel and Trastuzumab: the Trastuzumab prescribing label flags this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.
Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.
What the FDA labels say
From the Trastuzumab (Trazimera) label · effective 2026-04-10
AC Anthracycline (doxorubicin) and cyclophosphamide. → Paclitaxel+Trastuzumab 3.2% (64/2000) Includes 1 patient with fatal cardiomyopathy and 1 patient with sudden death without documented etiology.
In NSABP B31, 15% (158/1031) of patients discontinued trastuzumab due to clinical evidence of myocardial dysfunction or significant decline in LVEF after a median follow-up duration of 8.7 years in the AC-TH (anthracycline, cyclophosphamide, paclitaxel, and trastuzumab) arm.
Table 1: Incidence of Congestive Heart Failure in Adjuvant Breast Cancer Studies Incidence of Congestive Heart Failure % (n) Study Regimen Trastuzumab Control NSABP B31 & NCCTG N9831 Median follow-up duration for NSABP B31 & NCCTG N9831 combined was 8.3 years in the AC→paclitaxel+trastuzumab arm.
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Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.