FINALLY a question I know the answer to!!!! YAY!!
The answer is 8 weeks. When I went to new RD, she wanted to switch me from Humira to Remicade. I had already been off the Humira for 2+ months because of bladder infections. But by the time insurance prior authorized it had been another 2 months, for a total of 4 months since last Humira injection.
This time RD is switching me from Remicade to Orencia and she said there was an 8 week waiting period when switvhing biologicals.
So... 8 weeks.
Hope that helps!
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