Hello Cadi and thanks for posting,

I am not sure whether or not Herceptin will make you especially sensitive to the sun, I haven't been able to find much about it, but as this isn't listed in the manufacturers patient leaflet I assume it isn't a particular problem. When you have the chance ask your hospital about this as well. 

However, I do think it would be wise for you to continue to be very cautious in the sun. The standard sun safety advice is to rely on covering up and shade more than but as well as using sun screen. You can read more about sun safety on our website at this link. 

Give us a ring if you want to talk anything over, our number is 0808 800 4040, we are around weekdays 9-5. 

Best wishes, 

Julia