Simpson-Angus Scale (Drug-Induced Parkinsonism)
The Simpson-Angus Scale for drug-induced parkinsonism.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- 1. Gait
- 1
- 2. Arm dropping
- 1
- 3. Shoulder shaking
- 0
- 4. Elbow rigidity
- 2
- 5. Fixation of position (wrist rigidity)
- 1
- 6. Leg pendulousness
- 0
- 7. Head dropping
- 1
- 8. Glabella tap
- 1
- 9. Tremor
- 1
- 10. Salivation
- 0
Result: Simpson-Angus mean 0.80 (total 8 of 40), above the mean of 0.3 in common use.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Each item
- 0 normal, 1 slight, 2 mild, 3 moderate, 4 severe, across ten examination items.
- Mean
- Total divided by 10. The scale is conventionally reported as the mean, not the total.
- Above 0.3
- The mean in common use as the threshold for drug-induced parkinsonism.
What you enter
- 1. Gait (0 normal to 4 severe)
- 2. Arm dropping (0 normal to 4 severe)
- 3. Shoulder shaking (0 normal to 4 severe)
- 4. Elbow rigidity (0 normal to 4 severe)
- 5. Fixation of position (wrist rigidity) (0 normal to 4 severe)
- 6. Leg pendulousness (0 normal to 4 severe)
- 7. Head dropping (0 normal to 4 severe)
- 8. Glabella tap (0 normal to 4 severe)
- 9. Tremor (0 normal to 4 severe)
- 10. Salivation (0 normal to 4 severe)
How this is calculated
Simpson GM, Angus JW. A rating scale for extrapyramidal side effects. Acta Psychiatr Scand Suppl. 1970;212:11-19. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.