Anyone who has ever flipped through a medical dictionary can attest to the fact that there are a seemingly endless number of medicines that start with the letter Q. In fact, the letter Q is so common in medicine names that it can be difficult to keep track of all of the different options. Some of the most well-known medicines that start with Q include quetiapine, which is used to treat bipolar disorder, and quinidine, which is used to treat irregular heartbeats. However, these are just two of the many different options that are available. Other popular medicines that start with Q include quetiapine, quinine, and quinaxillin. No matter what medical condition you are trying to treat, there is likely a medicine out there that starts with the letter Q.