Let's take a minute to talk about your medication. This is an esmolol injection. You may hear it called by the brand name, 'Brevibloc'. This medicine helps treat fast heart beats. This medicine can help your heart to beat in a more normal way. It has other uses too, like treating high blood pressure. This medicine is given into a vein. This is called an 'IV' or 'intravenous' infusion. The infusion will be set on an IV pump, which will give a slow, constant dose to you. Your doctor and nurse will follow you closely. They will watch your heart rate and blood pressure. The most common side effect is low blood pressure, which could cause you to feel dizzy or sweaty. You should tell your nurse right away if you feel this way. The dose of this medicine can be reduced if needed, which should get rid of these side effects. You should tell your nurse if you notice other changes to your body. For example, some patients have nausea or problems at the injection site, like pain, redness, or swelling. As with any medicine, an allergic reaction could happen. This could cause a rash, itching, hives or swelling of the face or mouth. For best results with this medicine, talk to your health care team about any questions or concerns you may have.