(Also known as: ANTU; alpha-naphthyl thiourea ; alpha-naphthylthiocarbamide; krysid)
Alpha-naphthylthiourea is a rodenticide that is not generally approved for use in the developed world. It has high potential for bio-concentration, highly toxic to mammals and a skin and eye irritant. Alpha-naphthylthiourea is highly soluble in water and non-volatile but there is little environmental fate data or ecoxicology available.
The following alerts are based on the data in the tables below. An absence of an alert does not imply the substance has no implications for human health, biodiversity or the environment but just that we do not have the data to form a judgement.
Human health High alert: Mammals acute toxicity: High
Warning: Significant data are missing
An obsolete rodenticide that has been found to be useful primarily for control of the Norwegian rat.
Example pests controlled
Adult Norwegian rats (Rattus norvegicus)
Efficacy & activity
Effective against Norweigian rats but is less effective on other species.
Considered obsolete but may be available in some countries
Introduction & key dates
1945, first reported
UK regulatory status
UK COPR regulatory status
Date COPR inclusion expires
UK LERAP status
No UK approval for use
EC Regulation 1107/2009 (repealing 91/414)
EC Regulation 1107/2009 status
Date EC 1107/2009 inclusion expires
EU Candidate for substitution (CfS)
Listed in EU database
Approved for use (✓) under EC 1107/2009 in the following EU Member States
Lewis, K.A., Tzilivakis, J., Warner, D. and Green, A. (2016) An international database for pesticide risk assessments and management. Human and Ecological Risk Assessment: An International Journal, 22(4), 1050-1064. DOI: 10.1080/10807039.2015.1133242