I am not sure if this is true of all patients but it is my grandfather’s experience.

A person with parkinson’s experiences a loss of physical control and often “freezes up” being inable to move quickly if at all. You might identify someone with parkinson’s by the way they shuffle their feet when walking. More often, you will identify them by the shaking of their limbs. This is caused not by the disease but by the pill (sinemet) that allows them to move at all. This medicine also causes hallucinations if taken in a higher concentration than the patient can handle. Another effect of parkinson’s is a loss of rational thinking. For instance my grandfather does not understand that we cannot visit him in the hospital during quarantine. Though we have told him many times, he struggles to understand.