Independent register of U.S. FDA drug recalls · updated Oct 10, 2026
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Wrong potency or content

Sub- or super-potent product, or a failed content-uniformity / assay test. You may receive too little or too much active ingredient - a direct dosing risk.

992 FDA drug recalls with this cause, newest first.

These recalls cover sub-potent or super-potent products, or a failed content-uniformity test - meaning some pills in the same batch held noticeably different amounts of active ingredient than others. Either way it is a direct dosing risk: too little to work, or too much and harmful. Thyroid hormones and compounded injectables are the classic examples, because their dose window is narrow.

Class III · Low risk

DermaZinc Spray

Subpotent (Single Ingredient Drug): The firm is recalling the product because the product is subpotent and does not meet the labeled 0.25% zinc pyrithione level.

Terminated Wrong potency / content Quadrant Chemical Corporation D-1380-2012
Class II · Moderate risk

Levothroid

Subpotent (Single Ingredient Drug): Low assay at the 6-month test interval.

Terminated Wrong potency / content Lloyd Inc NDC 0456-1322-01 D-1394-2012
Class II · Moderate risk

Levothroid

Subpotent (Single Ingredient Drug): Low assay at the 9-month test interval.

Terminated Wrong potency / content Lloyd Inc NDC 0456-1321-01 D-1393-2012
Class II · Moderate risk

Xactdose Phenytoin Oral Suspension

Defective container; lidding deformity allows the contained product to transpire causing potential viscosity and assay failures. The viscosity and assay failures were due to the loss of moisture. The loss of moisture caused the viscosity to increase and assay to increase relative to the sample volume.

Terminated Wrong potency / content VistaPharm, Inc. NDC 66689-036-50 D-1440-2012
Class II · Moderate risk

Xactdose Phenytoin Oral Suspension

Defective container; lidding deformity allows the contained product to transpire causing potential viscosity and assay failures. The viscosity and assay failures were due to the loss of moisture. The loss of moisture caused the viscosity to increase and assay to increase relative to the sample volume

Terminated Wrong potency / content VistaPharm, Inc. NDC 66689-035-50 D-1658-2012
Class II · Moderate risk

Leflunomide tablets

Subpotent (Single Ingredient Drug): Distribution of product that did not meet specifications.

Terminated Wrong potency / content Apotex Corp. NDC 60505-2503-3 D-1662-2012
Class II · Moderate risk

Leflunomide tablets

Subpotent (Single Ingredient Drug): Distribution of product that did not meet specifications.

Terminated Wrong potency / content Apotex Corp. NDC 60505-2502-1 D-1661-2012