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These are side effects of Herceptin that I found on WEBMD.com



Diarrhea may occur. If this effect persists or worsens, notify your doctor promptly.

Remember that your doctor has prescribed this medication because the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Report promptly: trouble sleeping, increased coughing, swelling of the hands or feet, bone or joint pain, persistent sore throat, unusual fatigue, pain/redness at the injection site, nausea/vomiting, dizziness, headache.

Unlikely but report promptly: tingling hands or feet.

This medication can lower the body's ability to fight an infection. Notify your doctor promptly if you develop any signs of an infections such as fever, chills or persistent sore throat.

In the unlikely event you have an allergic reaction to this drug, seek immediate medical attention. Symptoms of an allergic reaction include rash, itching, swelling, severe dizziness, or trouble breathing. Symptoms may occur while the drug is being given; in these cases the drug infusion must be stopped. If you notice other effects not listed above, contact your doctor or pharmacist.