Medical Articles

Can You Guess the Taste Based on the Color of a Pill?

12.07.2026

What comes to mind when you hear the word “medicine”? Naturally, white tablets are often the first thing we imagine. However, if you type “medicine” into an online image search, you will find countless photos and illustrations of colorful, vibrant capsules. In fact, you can find capsules in a wide variety of vivid colors in the Philippines as well. In reality, the active pharmaceutical ingredients themselves are almost always colorless, and these bright hues come from added dyes. One of the few exceptions is the anti-inflammatory drug azulene, which is composed of molecules that are naturally blue. The name itself is derived from “azul,” which means “blue” in Spanish. The nickname for the Italian national soccer team, “Azzurri,” and the famous French coastal destination, the Côte d’Azur, also share this exact same linguistic root.

Let’s get back to the main topic. Why do we color medicines in the first place? There are two primary reasons. The first is to differentiate a product from those of competing companies. The reason Japanese medicines tend to look less flashy may be that consumers there generally prefer more understated tones over garish food colorings. However, in countries like the United States, where there is far less cultural resistance to food dyes, the market has long been filled with brightly colored foods and beverages, meaning vividly colored medications are much more readily accepted. In the competitive free-market economy of the United States, the color of a pill serves as a highly important element of branding and marketing.

The second reason is to create a lasting impression on patients, helping them remember to take their medication. Globally, utilizing distinct, intense colors is recognized as an effective way to make medications memorable so they are not easily forgotten. However, studies show that this specific psychological effect is somewhat less pronounced in Japan. Interestingly, another study reveals that the color of a medication is heavily linked to a person’s subconscious impression of its taste. Data shows that yellow pills are frequently associated with a salty taste, pink pills with a sweet taste, and black or green pills with a bitter taste. By strategically leveraging these psychological impressions—such as making children’s medications pink—we might significantly reduce a child's reluctance to take their necessary medicine.

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