I just received an email with the following information:
Updated Kashrus Alert [3/9/15]
[Courtesy of Rabbi Gershon Bess]
The following liquid medications do not contain any animal ingredients. The glycerin is vegetable based:
[Artificial flavor]
[All flavors including Dye-Free] [Artificial flavor]
Tylenol Infant drops – Cherry or Grape [Artificial flavor] NOT Dye-Free
[Artificial flavor] NOT Dye-Free
The following liquid medications do contain animal ingredients. The glycerin is animal based:
Tylenol Infant Drops – Cherry Dye Free
Store brands of Suspensions should not be used since glycerin is commonly derived from animal sources.