Secret drug tribulations and French legislation

From an official Montpellier prefecture paper of 18th century, we are interested in a secret drug from Provence origin: the Irro? powder. This purgative will pass from "secret" drug status to "patent" drug. It's notoriety will come from its arrival to Paris. The law of 21th germinal year XI, the decret of 25 prairial year XIII and this of 18th 1810 imposed to give the drug composition to an official status; that examined and permit it's sale. This secret will be produce for half century.