You should have been given a form to fill in prior to the drug screen - where you would have indicated ANY MEDICATIONS that you had taken in the period leading up to the testing. If you advised at this time that you had taken the Nurofen etc - no problem.
Its when you wait until the test is negative to say, "ohh yeah - I took a ?????" that you have a problem.
If you have done in it the right way - there shouldnt be a problem.
