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.
Can you safely take 800 mg Ibuprofen every 4 hours? Yes you can take 800mg safely - as long as you aren't taking any  other pain medications. And I believe it should be every 6-8hr for  that amount of ibuprofin.    â¦ You cannot MIX ibuprofin & Tylenol.