While most people tolerate lorazepam (Ativan®) well, side effects can still occur with this medicine. Common side effects of lorazepam can include dizziness, weakness, and unsteadiness. A few other possible lorazepam side effects include constipation, nausea, and impotence (also known as erectile dysfunction or ED). Some side effects of the drug, such as seizures or suicidal thoughts, are more serious and require immediate medical attention.
(To learn more about the common and uncommon side effects of this drug, click Lorazepam Side Effects.)