At first,Bayer sold the drug through doctors , who then sold it to their patients. In 1915,the company started to sell aspirin in drugstores. In the United States, Bayer had a patent on the drug. Other companies could make similar products and sell them in toher conuntries , but only bayer could make and sell aspirin in the United States. In time , bayer could no longer own the name aspirin in the United states. Other companies could make it the,too. However, bayer aspirin was the most well known , and for many years , it was the market leader.