Significance

• Approximately 34 percent of metronidazole users experience side effects. Side effects typically begin within the first few applications and gradually subside once your body becomes acclimated to the drug.
  
  

Types of Common Side Effects

• Common side effects of metrondiazole include pharyngitis, upper respiratory tract or sinus infections, headaches, back pain, dry skin, itching and burning or stinging after application of the cream.
  
  

Features

• When combined with blood thinners like Warfarin, metronidazole increases your risk of experiencing uncontrollable bleeding during surgery or following an injury.
  
  

Risks

• Metronidazole leads to the formation of basal cell carcinomas, a type of skin cancer, in approximately 1 percent of users.
  
  

Considerations

• Because there is not yet sufficient evidence that metronidazole has no unwanted effects upon the fetus, doctors typically do not prescribe the drug for pregnant women. If you have a history of blood dyscrasia, your doctor is not likely to prescribe metronidazole due to its potential side effects.