Paragraph IV Targets on Dayvigo & Lumify PF, CAFC Shields Vifor's Injectafer from $100M+ Claim, & Global IP Moves
API & IP Intelligence Roundup (21 September 2026) This edition highlights pivotal Hatch-Waxman Paragraph IV patent challenges against high-value insomnia and OTC eye-care franchises, critical commercial regulatory approvals in speciality injectables, and a decisive Federal Circuit ruling establishing strict boundaries for chemical process patents in Biofer v. Vifor . 1. New Paragraph IV Challenges: First-in-Line Targets on Dayvigo & Lumify PF The USFDA's updated Paragraph IV list recorded two notable first-time challenges initiating the race for 180-day generic marketing exclusivity : Lemborexant Oral Tablets (Dayvigo): After Eisai's 5-year New Chemical Entity (NCE) exclusivity expired, the inaugural Paragraph IV ANDA was filed on July 14, 2026 . Targeting the expanding dual orexin receptor antagonist (DORA) market (~$150M–$200M US; ~$500M globally), the generic filer is challenging core molecule, polymorph, and dosing regimen patents extending into 2034–2036 to ...