Hello, I'm an expert in pharmaceuticals with a focus on medication identification and usage. When it comes to identifying medications, color is often one of the key features to look for.

Viagra, which is the brand name for sildenafil, typically comes in blue, diamond-shaped pills. It's important to note that the color can vary slightly depending on the dosage, but the shape and color are distinctive features that help with identification.

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"The purple pill" is Nexium and the light blue angular pill, Viagra. Relying on trade dress to protect the pill color and shape after the patent term has expired enables the manufacturer to extend its market power via another form of intellectual property protection.read more >>