Liquid medications that contain food grade glycerin which is often derived from animals and is therefore, treif.

The following kashrus alert are from Rabbi Bess on March 9, 2015

Many liquid medications contain food grade glycerin which is often derived from animals and is therefore, treif. This is especially a problem with children’s medications that are quite palatable.
The following liquid medications do not contain any animal ingredients. The glycerin is vegetable based:

• Advil Infant’s Suspension White Grape Dye-Free [Artificial flavor]
• Advil Children’s Suspension [All flavors including Dye-Free] [Artificial flavor]
• Tylenol Infant drops - Cherry or Grape [Artificial flavor] NOT Dye-Free
• Tylenol Children’s Suspension - Cherry Blast or Grape [Artificial flavor] NOT Dye-Free
   
• Motrin Infants’ Drops - Berry and Dye-Free Berry
• Motrin Children’s - Berry and Dye-Free Berry

The following liquid medications do contain animal ingredients. The glycerin is animal based:

• Tylenol Infant Drops - Cherry Dye Free
• Tylenol Children’s Suspension Cherry Blast - Dye-Free Benadryl Children’s Allergy Liquid Benadryl children’s Allergy Plus Congestion Liquid

Store brands of Suspensions should not be used since glycerin is commonly derived from animal sources.

Kashrut.com has year-round information for Over the Counter Medications, Nutraceuticals and Vitamins at www.kashrut.com/articles/medicine_list