There are many different medicines that start with the letter X. These include drugs for treating conditions like Xadago, Xenical sweating, and Xerostomia. Each of these medicines has a different mechanism of action and side effect profile. Many of these drugs are available over the counter, but some may require a prescription from a healthcare provider. When choosing a medicine that starts with the letter X, it is important to consult with a healthcare provider to ensure that the drug is appropriate for your individual needs.