So, take 5 pills (5 mg), that is what is being used for two and a half days as a medication, dissolve them in 1 ml of water to have 0.5% of final solution.
"Colchicine, in the form of the autumn crocus (Colchicum autumnale), has been used as early as 1500 BC to treat joint swelling.[8] It was approved for medical use in the United States in 1961.[9] It is available as a generic medication in the United Kingdom.[6] In 2017, it was the 201st-most commonly prescribed medication in the United States, with more than two million prescriptions.[10][11"