Hi, I'm Aliza, a BC patient and the site's unofficial Medical Librarian. Librarians answer questions, but usually non medical ones (we shy away from med questions since offering that kind of advice violates our Code of Ethics and also happens to fall under practicing medicine without a license which is a bit illegal). But we offer referrals to docs, hospitals, institutions, agencies, websites, books, media, etc. I also research when requested or required.
Re your question - you see from above that I cannot answer it except to say that the person you should be asking is your doctor. She/he is the best source for this information as far as giving you information re pharmacology in relation to whatever other drugs/chemo you're currently taking and what would be suitable for you. Try to reach her/him or the doctor who covers for her/him over the weekend at your treating hospital and explain the situation as you did above. Few of us on the site (except a very few, like Carm), have medical qualifications necessary to tell anyone what medications to take, or know how something could interact with anything else (much less what allergies or sensitivities someone could have). But your doctor knows all of these things about you..
Better make that call asap so you're comfortable sooner than later.