What are the side effects of interferons?
• Injection site reaction (redness, itching, pain) • Injection site necrosis, though rare, can be seen with Betaseron® and Rebif® • Flu-like symptoms (fever, chills, muscle pain, malaise) • Abnormal white blood count and liver function tests • Menstrual disorders (see fertility issues) • Depression • Fatigue • Spasticity (may worsen preexisting stiffness)