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Table 4 Safety scoring according to LD50

From: Do ethnobotanical and laboratory data predict clinical safety and efficacy of anti-malarial plants?

OECD classification Score Acute LD50 for rats (mg/kg body weight)
Oral
Solid
Very toxic -10 ≤5
Toxic -8 >5 – 50
Harmful -5 >50 – 500
No label 0 >500 – 2000
Unlikely to present acute hazard +6 >2000
Not Tested 0  
  1. (Source: Walum, E. (1998). "Acute Oral Toxicity." Environmental Health Perspectives 106(Supplement 2): 497-503.