How long do cannabinoids remain in the urine after the use of marijuana?
Cannabinoids are fat soluble, so they are eliminated from the body slowly. A single use of marijuana will leave traces in the urine for about 48 hours. If marijuana is used medicinally and thus repeatedly, traces of cannabinoid derivatives will remain in the urine for as long as five or six weeks after cessation of use. The more liquids a person drinks just before the time of observation, the lower the proportion of cannabinoid derivatives found in the urine. All of the above applies not only to whole smoked cannabis but to dronabinol (Marinol), the synthetic form of tetrahydrocannabinol that is legally available as a prescription drug.
