The most commonly reported adverse reactions are lymphopenia, injection site reaction, asthenia, flu-like symptom complex, headache, and pain. Betaseron should be used with caution in patients with depression. Injection site necrosis has been reported in 5% of patients in controlled trials. Patients should be advised of the importance of rotating injection sites. Female patients should be warned about the potential risk to pregnancy. Cases of anaphylaxis have been reported rarely. (See Medication Guide.)
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