Taking Herceptin infusion once every 3 weeks. Can you be out in the sun while on Herceptin?

Common side effects does not indicate any effects of being exposed to sunlight, however please check with your pharmacist/doc. who has prescribed the drug.

Herceptin - common side effects:

Abnormal skin sensations; back pain; cough; diarrhea; dizziness; headache; loss of appetite; muscle, bone, or joint pain; nose, sinus, or throat inflammation; runny nose; stomach pain; trouble sleeping.

Expand this post...

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue; unusual hoarseness); change in the amount of urine produced; chest pain; difficult or painful urination; fainting; fast or irregular heartbeat; fever and chills; mood or mental changes (eg, depression); nausea; new or worsening shortness of breath; pain, redness, or swelling at the injection site; persistent cough; severe or persistent dizziness, lightheadedness, or headache; skin infection (eg, skin discharge, redness, swelling, or warmth); sore throat; sudden unexplained weight gain; swelling of feet or ankles; unusual fatigue or weakness; vomiting; weakness; wheezing.
Read more: http://www.drugs.com/sfx/herceptin-side-effects.html#ixzz0n8RiwuRX

Hope this helps? Best of luck.