Chiming in with Sophie I was on a maintenance dose of Diflucan for months during treatment. The thrush started when the Zerostomia (dry mouth) kicked in, at about mid treatment. Any change in the pH in your mouth can start it. At one point I was taking 400 mg/day.

Gary Allsebrook
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Dx 11/22/02, SCC, 6 x 3 cm Polypoid tumor, rt tonsil, Stage III/IVA, T3N0M0 G1/2
Tx 1/28/03 - 3/19/03, Cisplatin ct x2, IMRT, bilateral, with boost, x35(69.96Gy)
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"You are a mist that appears for a little while and then vanishes" (James 4:14 NIV)