The primary reason drug companies advertise the drugs they manufacture is to increase demand for their products. When people are informed about specific medications, they may be more likely to ask their healthcare providers about those drugs, thereby driving sales. This is particularly significant in countries like the United States, where direct-to-consumer advertising of prescription medications is allowed.
While some drug companies may also aim to raise awareness about medical conditions and encourage people to seek treatment, the overarching goal is typically linked to increasing revenue by promoting their products.