Klonopin slows the electrical responses in the brain to relieve anxiety and reduce seizures, according to the U.S. National Library of Medicine. This decrease in stimulation produces a sedative effect, among other effects.
Some patients become sleepy or uncoordinated while taking Klonopin, according to RxList. Other patients feel dizzy and have trouble standing or walking. According to the U.S. National Library of Medicine, some people also experience short-term memory problems and visual issues. More serious side effects include an allergic reaction in which the face swells and the person has trouble breathing. If serious side effects occur, patients must seek emergency medical attention.