Pyrrolidine dithiocarbamate (PDTC) was examined for its potential in the intranasal treatment of human rhinovirus infections. Prior to clinical testing, a comprehensive non-clinical programme was performed to evaluate the general toxicity of PDTC. The animal experiments included investigations in rodents with study durations ranging from single dose to repeated dosing over a period of 28 days. The routes of administration were intranasal, inhalative, oral and intravenous for single-dose toxicity and pharmacokinetic studies, and intranasal for repeated dose studies. Blood and tissue samples were obtained from PDTC-treated rats to analyse pharmacokinetics and tissue distribution. Accumulation of selected metals due to PDTC treatment was examined in liver, brain, nerves and fat tissues.