AstraZeneca Petition Seeks to Block Cipla's Generic Lynparza

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AstraZeneca has petitioned FDA to withhold approval of a Cipla ANDA for proposed new strengths of generic Lynparza (olaparib) tablets unless the generic company provides additional evidence addressing formulation differences, tablet size and potential medication errors. Lynparza, a PARP inhibitor approved for certain ovarian, breast, pancreatic and prostate cancers, is currently marketed in 100 mg and 150 mg tablet strengths.

In a just-posted citizen petition, AstraZeneca argues that Cipla's proposed 200 mg, 250 mg and 300 mg tablets could raise safety and effectiveness concerns because they reportedly omit copovidone, a polymer used in the approved Lynparza formulation.

AstraZeneca contends that eliminating copovidone could affect olaparib's dissolution, stability and bioavailability. It cites FDA's August 2026 draft product-specific guidance, which identifies the polymer used in olaparib's solid dispersion as a critical excipient.

The brand company wants the agency to require comparative dissolution studies, stability data, evidence that the drug maintains its amorphous state during manufacturing and storage, and physiologically based biopharmaceutics modeling.

AstraZeneca also raises concerns that higher-strength tablets could be more difficult to swallow and that introducing three additional strengths could increase medication errors, particularly when patients undergo dose reductions. The petition asks FDA to require a formal medication-error risk assessment, including simulated-use testing, before approving Cipla's application.

Additionally, AstraZeneca argues that if the formulation changes or medication-error risks require new clinical investigations or significant labeling modifications, FDA should determine that the ANDA pathway is inappropriate.

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