Diflucan is the trade name of Fluconazole and is an antifungal used to treat Candida infections. Diflucan is a prescription antifungal, and should be taken by following the instructions your doctor has given when it was prescribed. It is used to treat fungal infections where many other treatments have failed, and patients who are prescribed Diflucan tend to have weaker immune systems.
As with all medications you may experience side effects such as rash, headache, nausea, diarrhea, constipation, or a variety of other side effects, and it is recommended that if you are experiencing any of them that you visit your doctor.
There is no doubt about the effectiveness of Diflucan, and it appears to get rid of most people infected with Candida http://jac.oxfordjournals.org/content/44/4/429.full. It is important though that even if you get rid of the Candida in your body, you have to take care of it as well as possible. If you do not take care of your body, you will just keep getting it again and again. It is not always possible to stay completely healthy as many people on Diflucan have impaired immune systems from AIDS or Cancer Treatment, but I still implore you to eat as healthy and clean as possible as it will still be better than doing nothing but loading your body up with pharmaceuticals.