Development and Regulatory status
Jun 19: Launched in the US .
Apr 19: Approved in US .
Aug 18: NDA resubmitted in US with additional pharmacokinetic data 
Jun 18: FDA CRL noted questions regarding pharmacokinetic data. Valeant Pharmaceuticals have requested a meeting with the FDA to discuss. 
Nov 17: Ortho Dermatologics, a division of Valeant Pharmaceuticals International announced that the US FDA has accepted the NDA IDP-118 (halobetasol propionate and tazarotene) lotion with a PDUFA action date of June 18, 2018. 
Sep 17: The company submitted the NDA to US FDA. [1,2]
Trial or other data
Sep 17: Filing was based on data from two PIII multi-centre randomised, double-blind clinical trials in 418 pts >18 years who had 3-12% of their body surface affected by plaque psoriasis. In both trials, the compound met the primary efficacy endpoint of “clear” to “almost clear” score at least a 2-grade improvement based on an Investigator Global Assessment (IGA) at 8 weeks, and a “clear” to “almost clear” and at least a 2-grade improvement during a 4-week follow-up visit at week 12. The NDA also had data from a long-term safety study involving pts followed up after a year. The most common adverse events were contact dermatitis (7.4%) and application site pain (2.6%). The PIII programme was preceded by a successful PII study where the treatment success rate with IDP-118, was 52.5%, which was superior to each of the components (halobetasol propionate and tazarotene) alone. This demonstrated, that the IDP-118 formulation is superior to the components separately.