Registration Dossier

Diss Factsheets

Administrative data

Description of key information

Oral (Rat, GLP): LD50 > 2000 mg/kg
[Bayer Schering Pharma AG, Report No. A49530, 2010-06-08]
Dermal (Rat, GLP): LD50 > 2000 mg/kg
[Bayer Schering Pharma AG, Report No. A49584, 2010-06-17]

Key value for chemical safety assessment

Additional information

The single oral administration of ethisterone (ZK 5957) to male and female rats at a dose of 2000 mg/kg was tolerated without any compound-related clinical or macroscopical pathological signs. The acute oral toxicity of ethisterone in rats is > 2000 mg/kg body weight. (Bayer Schering Pharma AG, Report No. A49530, 2010-06-08 )

The single dermal administration of ethisterone to male and female rats in the doses of 2000 mg/kg resulted in hair loss in 1/3 female rat. No other compound-related clinical or macroscopic pathological signs were observed. LD50 > 2000 mg/kg (Bayer Schering Pharma AG, Report No. A49584, 2010-06-17)

 

Justification for classification or non-classification

Due to the results (LD50 > 2000 mg/kg) in the dermal and oral acute toxicity tests classification according to Directive 67/548/EEC and Regulation 1272/2008/EC is not required.