HCPCS Code J9354: Injection, Ado-trastuzumab Emtansine, 1 mg

As with every injected medicine, the patient will feel pain and discomfort in the injection site. The side effects that the patient might have include fatigue, nausea, headaches, a low platelet count, and possibly a fever.

These are rare, but the adverse effects of this medicine include allergic reactions to it, congestive heart failure (hence the requirement of having prior heart function test results), and liver toxicity.

It can take up to an hour and thirty minutes at most, and this is done every three weeks or whatever is mentioned in the patient's treatment plan.