Fluphenazine, a dopamine antagonist, acts in the following ways to cause dystonia, involuntary muscle contractions, resulting in repeated or twisting motions, cramping, or abnormal posture.
Blocks postsynaptic dopamine receptors, causing higher levels of dopamine, leading to auto-resistance in the body.
Over-stimulates the brain with a higher level of Glutamate, causing the over-excitement of muscles.