Usually doctor’s recommended dosage of diflucan is a single dose of 150mg to be taken orally. However, you should take diflucan dosage only as directed by your doctor or pharmacist. Common side effects of diflucan include nausea, abdominal pain, diarrhea, dyspepsia, dizziness and taste distortion. Although rare allergic reactions to diflucan, can be potentially serious if they are not treated immediately. Symptoms of an allergic reaction to diflucan can include, coughing, wheezing, chills, fever, swelling of the eyelids, mouth , beck of any other part of the body  or blisters on the skin with skin peeling. It is for these reasons that you should always tell your doctor about any other medical condition that you may have or about any other medication that you may be taking before taking diflucan. In certain patients with serious medical conditions such as cancer or AIDS, sometimes rare cases of severe rashes have been reported. You should immediately contact your doctor if you were to get a rash while taking diflucan.