Drugs that block dopamine receptors can cause Tardive Dyskinesia
An estimated 250,000 to 400,000 people in the United States have Tardive Dyskinesia, a disfiguring and debilitating involuntary movement disorder involving symptoms such as lip smacking, tongue thrusting and protruding, eye blinking and bulging, head jerking, facial grimacing, and puckering and pulsing of the lips. The muscle spasms can become painful and embarrassing and often are permanent. But what is most disturbing is that in many cases, the condition could have been prevented.