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When and How to Take Trastuzumab

Some general considerations for when and how to take this medication include the following:
  • Trastuzumab is given intravenously (by IV) every seven days or every three weeks, depending on the dosing regimen. 
  • Your first infusion will last 90 minutes, and subsequent infusions may be shorter, depending on the dosing regimen.
  • Most people receive their infusion at their healthcare provider's office, a hospital, or at an "infusion center."
  • For the medication to work properly, it must be taken as prescribed. Trastuzumab will not work as well if you stop taking it before your healthcare provider recommends.

Dosing Information for Trastuzumab

The dose of trastuzumab that your healthcare provider recommends will vary, depending on a number of factors, including:
  • The type of cancer (breast or stomach)
  • The severity of your breast cancer (see Breast Cancer Stages)
  • Your weight
  • Other medications you may be taking
  • Other medical conditions you may have.
As is always the case, do not adjust your trastuzumab dose unless your healthcare provider specifically instructs you to do so.
(Click Trastuzumab Dosing for more information.)

Drug Interactions With Trastuzumab

Trastuzumab can potentially interact with a few other medicines (see Drug Interactions With Trastuzumab).
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Trastuzumab Drug Information

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