Overdose is rare: Herceptin (trastuzumab) is what is referred to as a monoclonal antibody that is used to treat some types of cancer(breast, stomach). It is typically administered by IV in a controlled setting so overdose is rare. Although cardiac issues may arise in 2-7% of patients who recieve this, it does not appear to be dose related. An "accidental overdose" has not been shown to be detrimental.
Answered 11/7/2015
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