List drug brands in oral factor b inhibitors that have recently improved their products in united states?

Short answer: There are no FDA-approved oral Factor B inhibitors in the United States, so there are no brand names to list.

What exists in the market or near-market:
- The leading oral Factor B inhibitor in development is iptacopan (development code LNP023) from Novartis. It is an oral Factor B inhibitor, but as of now it does not have an approved brand name in the US because it has not been approved yet. It has been studied in Phase 3 for diseases like IgA nephropathy and other complement-mediated conditions.

If you were asking about investigational products or the latest trial statuses and any announced improvements (formulation, dosing, etc.), I can summarize current publicly disclosed information or look up the latest updates for you.