Hi John. This is a bit of a puzzle. Lansoprazole is not usually prescribed with docetaxel treatment, which of itself does not normally cause excess stomach acidity. Perhaps you reported excess acid to your oncologist? Incidentally, I am on the same dosage, but prescribed for a hiatus hernia. I never had it during my chemo not did I feel the need. It can be taken in the morning, or as I do, half an hour or an hour before my evening meal. It seems to suit me better, after some experimentation with split doses and different times, after a chat with my GP.
AC