Novel Psychoactive Substance Surveillance & Trends
Monthly analysis of NPS mentions across Reddit, identified via NLP pipeline.
01
Monthly NPS Alerts
Substances flagged for volume spike (≥2× prior month) or first appearance · evaluated on most recent month
02
Multi-Line Temporal Trends by Drug Group
Select a drug group to show all its substances as individual lines · combined NPS (existing + new) · hover for values
03
Small Multiples — Top 10 Existing NPS
Top 10 existing NPS by last month mention volume · independent y-axes · red dots = anomaly months (z > 2)
04
Rank Shifts & Recent Growth — New NPS Only
Substances from new_meds_identified pipeline only · rising lines = emerging NPS gaining discussion volume
Bump chart — rank over time
Rank 1 = most discussed new NPS that month.
Recent growth — avg. MoM %
Average month-over-month change, last 3 months (smoothed).
05
Top Substances — Most Recent Month
Existing tracked NPS only · ranked by mention volume with month-over-month change
06–07
Co-Mention Connections & Seasonality
See per-panel notes — data scope differs between the two
Chord diagram — co-mention connections
Combined NPS (existing + new) · ribbon width = posts mentioning both substances · hover to isolate connections
Radial seasonality
Existing tracked NPS only · angle = calendar month · one loop per year · overlapping loops reveal seasonal patterns
08
Drill-Down
Monthly mentions with cumulative total and anomaly flags
09
Temporal Analysis by Drug Category
Monthly mention volume by drug category · filter below