I have been taking Sudafed 60mg tablets (for a chest infection) for two days, 3 tablets on the first day and 4 today. My doctor told me to take between 3 and 4 per day until they are all gone. I am going to a concert in 1.5 days time and will be taking mdma. How long will the Sudafed stay in my system if I stop taking it in approxiamately 20 hours? How long does would it take for my body to rid itself of the Sudafed? I know I amtaking a big risk here, please don t tell me to not take the mdma because that is not what I m asking. I just want to know when I should stop taking the Sudafed so to lower the risk of something bad (reaction, overdose etc) happening at the concert?