Tower Laboratories CGMP Violations

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A 7/8-7/11/2025 FDA inspection at the Tower Laboratories drug manufacturing facility in Montague, MI, found significant violations of current good manufacturing practice (CGMP) regulations for finished drugs. A 12/23/2025 Warning Letter says the specific violations were:

  • failure to thoroughly investigate any unexplained discrepancy or failure of a batch or any of its components to meet any of its specifications, whether or not the batch had already been distributed; and
  • failure to establish laboratory controls that include scientifically sound and appropriate specifications, standards, sampling plans, and test procedures designed to assure that components, drug product containers, closures, in-process materials, labeling, and drug products conform to appropriate standards of identity, strength, quality, and purity.

The letter says the firm’s response to the inspection observations was inadequate. Tower was told to correct the violations promptly and to respond with a list of specific actions it has taken to address the violations and prevent their recurrence, with a schedule for completing the corrections.

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