In general, MDMA can be detected in urine tests for 2 to 5 days after use. There are a few factors to remember, however. Mainly the size of the last dose taken. The half life of E is six hours, so every six hours, the amount in your body is halved. So a 128 mg dose taken at midnight would reduce to 64 mg by 6am; 32 mg by midday and so on down to 1 mg in less than 48 hours. However, this is assuming that you only took the 128 mg dose. If you took more E, than you would have to add up the doses. Also, if you take several Es every weekend, it is possible that some may be stored in your body fat and will be released gradually over a couple of weeks.

The best way to pass a urine test is to dilute your urine by drinking water right up until you test, to wash yourself out. Also, taking Vitamin C will help get rid of most drugs, and is probably as effective as the products sold for that purpose (ie, "The Stuff").