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.
Re: How soon after tylenol can I give ibuprofen. 1  mertense: I can't remember what the timing was. DD has a fever of 103 and it came down .2 degrees with tylenol in the last 45 mintues. 2  Now, I'm no doctor, but my son just went through a whole week of 103 - 105.6 fevers.