Duplication or reproduction of existing classified information is not derivative classification. Persons who apply classification markings derived from source material or as directed by a classification guide need not possess original classification authority. (b) Responsibility.
According to my doctor, 4 hours. You can switch them up. Take acetaminophen, (Tylenol), then wait 4 hours and take Ibuprofen, wait another 4 hours and take acetaminophen and so on. :) 15 people found this useful.
8 May 2014. Yes. Regular ibuprofen can be taken again in 6 hours or in 6 hours you can take whatever you like. Most meds like Tylenol, ibuprofen, etc... can be taken every 4 to 6 hours as needed in whatever combination you choose. Votes: +0.