Just got this in an email from Northstar:
I have received confirmation that all strengths of the Northstar levothyroxine are no longer in stock and have reverted back to the supplier livery (i.e., Accord for 50 mcg and 100 mcg and Teva for 25 mcg).
I breathe a sigh of relief that we will no longer have that bit of confusion!
(Just adding: I had suspicions for a while this was on the cards. And Northstar product might continue to be supplied for some time - I simply do not know.)