A recall you might want to look at

FDA Informs Public of Nationwide Recall of 500mg Strength Store-Brand Acetaminophen Caplets

These are for various store brands, including those listed at: http://www.fda.gov/oc/po/firmrecalls/perrigo/perrigocustlist.html. Lot numbers affected can be found here: http://www.fda.gov/oc/po/firmrecalls/perrigo/perrigobatchlist.html.

The recall is being made because of small metal fragments apparently due to premature wearing of the equipment in the pill factory. The recall only affects 500 mg tablet strength, so there is no anticipated shortage of acetaminophen (the generic form of Tylenol). Tylenol itself is also not covered by this recall. It covers various store brand alternatives to that product. All told about 11 million bottles are affected.