Here is My Question:
How long does Avonex stay in the body?
Following a 30 mcg intramuscular injection, peak levels are reached in 15 hours (in some as early as 6 hours) and then decline thereafter with an elimination half life of 19 hours. We typical consider a drug fully eliminated after 5 half lives or, in this case within 4 to 5 days after the injection. However, the biological effects of the drug can persist much longer than the drug itself.
Hope that helps
Revere (Rip) Kinkel MD
Professor of Clinical Neurosciences
Director of the Multiple Sclerosis Program
Clinical Neurosciences Director
University of California San Diego
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