Robbin,
I don't know what reaction you had to Herceptin, or how your doctor determined you were allergic to it. Herceptin can be prepared for infusion in one of two ways:
1) BWFI, USP, 1.1% benzyl alcohol preserved
2) For patients with known hypersensitivity to benzyl alcohol, Sterile Water for Injection
Perhaps you had an allergic reaction to the reconstitutive agent, and not the Herceptin itself? It may be worthwhile to ask your physician about it.
For information on Tamoxifen use in Her2+ patients, there is a good discussion in the current thread:
http://her2support.org/vbulletin/sho...rid=1173<br />
Best of luck with your treatment plan,
Hopeful