What are the side effects of Vaniqa (eflornithine)?

You may experience some or all of the following side effects after treating your skin with eflornithine:
  • You may have a stinging, burning or tingling on your skin.
  • Your skin may turn reddish in color.
  • Your may develop a skin rash.
  •  You might develop acne.
  •  You might develop swollen patches of skin.
If any of these symptoms persist, tell your doctor. Report any serious side effects, such as severe skin irritation.