Lorazepam is a medication known as a benzodiazepine. These medications work on certain receptors in your brain to keep it from being hyperactive. They are usually used for sleep and also for anxiety. Benzodiazepines work similiar to alcohol so they have a change of becoming addictive. They are not a suggested treatment for headaches. Some of the side effects is that it can make people sleepy, tired, slow down their reflexes, cause the heart rate to drop and also if taken too much, can slow down your breathing. For headaches, depending on your daughter s age, she can take over the counter medications such as tylenol or ibuprofen.