Chalky and weak toenails and fingernails

Taxol made a mess of my toenails. My fingernail damage was hardly noticeable but my toenails discoloured, split, expanded, went chalky, everything except drop off! It can take some considerable time to improve. I would have expected to see some deterioration while you were still on chemo but, as others have said, side effects may start afterwards, just to annoy. Always wise to talk with your oncologist. It may be a combination of things. Essentially if it's chemo related, it more or less has to grow out, which can be slow. Mine started to improve slowly a few months after Taxol was finished, Herceptin didn't seem to have any impact. Good luck.