FD&C Red No. 40

FD&C Red No. 40 in Medications

FD&C Red No. 40: A Common Red Dye

FD&C Red No. 40 is a color additive used in some medications for appearance and product identification.

It does not treat symptoms.

What Is FD&C Red No. 40?

FD&C Red No. 40 is a synthetic dye used in pharmaceuticals and foods. It may appear as a dye or as an aluminum lake in coatings.

Why Is FD&C Red No. 40 Used in Medications?

It is used because it:

  • Provides consistent color
  • Helps distinguish products or strengths
  • Improves visual identification

Ingredient Names to Look For

It may be listed as:

  • FD&C Red No. 40
  • FD&C Red 40
  • Red 40
  • Allura Red AC
  • FD&C Red No. 40 Aluminum Lake

Where Does It Appear?

It is commonly found in:

  • Tablet coatings
  • Capsule shells
  • Liquids, suspensions, and syrups

How to Check a Medication’s Ingredient List

Dyes vary by manufacturer and dosage form.

Use PillParser to scan a medication and view its ingredient list.



Type a brand (Advil) or generic (Ibuprofen). We’ll find the label details.

To keep PillParser free, anonymous scans are limited.

Understanding ingredient differences is especially important for individuals with known sensitivities. RxAllergyScan.com allows users to compare medication ingredients against their personal allergen profile.

Educational Note

This page provides educational information only and does not make medical claims.