The preparation discusses the present-day legislation concerning the handling of chemical substances and preparations in the Czech Republic (Law No. 356/2003 Coll., Regulation No. 369/2005 Coll.), the passages important for the operation of the workplaces performing synthesis and analysis of drugs, including the new duties of the employer. The legal regulation valid in the Czech Republic is compared in the selected parts with that valid in the Slovak Republic. The authors primarily recommend the workplaces engaged in drug synthesis and analysis to limit the use of chemical substances classified as highly toxic.

        Key words: dangerous chemical substances – legislation – highly toxic substances