The company said a chemical used in the packaging may be to blame.
If you have a bottle of the caplets, stop using it and contact Tylenol for a refund.
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The makers of Tylenol have recalled arthritis pain caplets.
The product that is affected comes in 100-count bottles with red easy-open caps. Customers said the pills caused nausea and upset stomachs and had an unusual moldy odor.