Also, another study suggests effects last up to 2 weeks past last administration:
"Unlike testosterone, the PEE of Anacyclus pyrethrum shows efficacy in rats tested after the lapse of 7 and 15 days of discontinuation of treatment. This suggests that the drug has prolonged effect and capacitate the treated rats for improved sexual potential."
Effects of petroleum ether extract of Anacyclus pyrethrum DC. on sexual behavior in male rats.
Sharma V, Thakur M, Chauhan NS, Dixit VK.
SourceDepartment of Pharmaceutical Sciences, Dr. Hari Singh Gour Vishwavidyalaya, Sagar 470003, India.