3. Slow Movements
Although most people with TD move more quickly or erratically, in some cases, symptoms of TD may be characterized by slower movements. One reason for this is the level of dopamine that exists in the body as the result of antipsychotic drugs. The less dopamine there is in the system. The less efficient the communication between cells is.
Psychosis is caused by an excess of dopamine which throws off this communication. Anti-psychotic drugs lower dopamine levels and can disrupt signals between cells. This can delay the information that is passed from one cell to another and can result in slower movement.
In addition, someone may feel so shaky that they may try harder to focus and to move and they may move more slowly than they would usually.