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.
According to experts, it takes 15- 20 min for Ibuprofen to kick in and close to 2 hours to take effect. It also depends on the form of Ibuprofen, like; if you are taking ibuprofen in liquid form it will take lesser time as the body doesnât need to break down the capsule/Tablet.