The usual dose of Diflucan for candidiasis of the mouth and throat is 200 milligrams on the first day, followed by 100 milligrams once a day. You should see results in a few days, but treatment should continue for at least 2 weeks to avoid a relapse. For candidiasis of the esophagus (gullet) the usual dose is 200 milligrams on the first day, followed by 100 milligrams once a day. A dose of 400 milligrams a day can ... be taken if your infection is more severe. Treatment should continue for a minimum of 3 weeks and for at least 2 weeks after symptoms have stopped.