The electromagnetic (EM) spectrum is the range of all types of EM radiation. Radiation is energy that travels and spreads out as it goes  the visible light that comes from a lamp in your house and the radio waves that come from a radio station are two types of electromagnetic radiation.
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 sâ¦o on.
3 I took 400mg of ibuprofen and now im afraid its gonna have a bad interaction with my xarelto what could happen how long does it stay in my system ?? Dr. Aimee Barton Dr. Barton. 2 doctors agreed: 6-8 hours: The good news is that 400 mg of ibuprofen is a relatively low dose. You should watch for any signs of bleeding or increased bruising. You should opt for tylenol if you need pain meds, no more than 4 grams in 24 hours. (2 extra strength every 6 hours).