Some of the newer, more targeted chemotherapy drugs will not affect your hair. But the majority of drugs used do cause hair loss. Unfortunately, there's nothing you can do to prevent it. Depending on the drug, your hair may gradually thin before you lose it -- or you may lose all your hair at once.
The breast cancer drug Cytoxan (cyclophosphamide) causes hair thinning but not complete hair loss.
Adrucil (fluorouracil) does not cause hair loss.
Adriamycin (doxorubicin) causes...