I think it happens all the time and I don't see why FTC would get involved. Will FTC get involved when GILD coformulates GS-7977 which they acquired via Pharmasset with their own in-house NS5a?
If ABT got away with coformulating lopinavir and ritonavir and then raising the price of stand-alone ritonavir five-fold to drive the PI business toward Kaletra, I think Roche has little to worry about here.