FDA Denies Otsuka Samsca Petition
FDA has denied an Otsuka 8/23/19 petition asking the agency to declare that its Samsca (tolvaptan) 60 milligram tablets were withdrawn for safety reasons. The petition also asked that FDA not approve any pending ANDA for generic Samsca and suspend and withdraw approval of any ANDA for a generic version of Samsca.
In its response, FDA said the company asked for the determination that Samsca was withdrawn for reasons of safety due to the potential for inappropriate prescribing to patients with autosomal dominant polycystic kidney disease (ADPKD). The agency says it reviewed its 2016 determination that the Samsca tablets were not withdrawn for reasons of safety and there was no need to revisit that determination following agency approval of Otsuka’s Jynarque (tolvaptan) tablets for treating ADPKD.
“When FDA approved Jynarque,” the denial letter says, “the agency was aware of the risks associated with Jynarque and the potential for off-label use of Samsca or a future generic of Samsca for ADPKD…. The agency assessed the risk of Samsca being used off-label to treat ADPKD at the time of Jynarque’s approval. Importantly, this assessment contemplated the introduction of any generic drug products referencing Samsca. We determined that the appropriate risk-mitigation approach was to included a Boxed Warning in Samsca’s labeling explicitly stating Samsca’s contraindication for use in patients with ADPKD. Samsca’s labeling currently contains this Boxed Warning and Contraindication. Your petition presents no evidence to show that changes in use have occurred since the time of the agency’s actions in 2018 such that it would be appropriate for the agency to take new measures at this time.”