Yes, clonidine can cause bradycardia, which is a slower than normal heart rate. Clonidine is a medication that is commonly used to treat high blood pressure and anxiety disorders. It works by relaxing blood vessels and decreasing heart rate. However, it can also have side effects, and bradycardia is one of them. It is important to monitor your heart rate while taking clonidine and to inform your doctor if you experience any irregularities.