https://www.rcpe.ac.uk/journal/issue/journal_36_4/CME_movement.pdf
Movement disorders: a brief practical approach to diagnosis and management D.J.Burn Coll Physicians Edinb 2006; 36:331–335 [former Parkinson’s uk clinical director]
Points to remember in the history and examination:
Time course/functional disability/effect upon quality of life.
Drug history – current, previous, and recreational (may need to contact family doctor)…
Always consider drugs, both past and present, as a potential cause for the movement disorder.
Dopamine receptor blocking drugs may cause any movement disorder and their adverse effects may persist after the offending agent has been discontinued.
NCBI - WWW Error Blocked Diagnostic
Levodopa induced Dyskinesia: Clinical Features, Pathophysiology, and Medical Management Sanjay Pandey, Prachaya Srivanitchapoom. Ann Indian Acad Neurol 2017;20:1
Levodopa is the most effective drug for treating Parkinson’s disease (PD), but its long term use is complicated by motor fluctuations and dyskinesia. Dyskinesia may be mild at the beginning but may progress to become a disabling symptom and may interfere with quality of life. Different types of movement disorders are seen in levodopa induced dyskinesia (LID) including chorea, ballism, dystonia, myoclonus, or combination of any of these movements. These dyskinesias are seen in the neck, facial muscles, jaw, tongue, hip, shoulder, trunk, and limb or may appear as involuntary flexion of toes.
side effects of Sinemet include: uncontrolled muscle movements in your face (chewing, lip smacking, frowning, tongue movement, blinking or eye movement); trismus, extrapyramidal disorder [dystonia, dyskinesia, akathisia & parkinsonism], increased tremor
https://www.drugs.com/sfx/levodopa-side-effects.html
Nervous system side effects most frequently reported have included involuntary movements and mental status changes (in as many as 50% of treated patients on long-term therapy). The types of involuntary movements due to levodopa have been characterized as choreiform, dystonic and dyskinetic….Choreiform movements due to levodopa therapy may occur in as many as 80% of patients treated for one year and frequently involve facial grimacing, exaggerated chewing, and twisting and protrusion of the tongue.