I am on Avonex and I was wondering if any of you have experienced longer periods/spotting? I talked to the drug company and they said that it is a reported side effect. My OB also did a sonogram to rule out other issues. I never had this problem before Avonex, and I was wondering if it ever gets better? I had spotting for 2 days 4-5 days of normal flow, and now I have spotted off and on again for about 4 days....it is just annoying!!