You don't need to worry about missing a dose. Nothing bad will happen as the result. Of course it isn't wise to miss, but occasionally these things happen. I'm sure your doctor will tell you the same thing.
I've been on Avonex for 3+ years and have done quite well overall.
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I take avonex and the nurse told me that I could take it a day late or a day early. They do get it to me within a day of ordering it.
Hi~ I'm fairly new to Avonex but from what I understand, they can get it shipped to you very quickly. I bet if you call they can get it to you in 1 day. I would take it as soon as you get it and then ask your doctor when to take the next dose. Good luck!