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.
I was told by my doctor to give the motrin first. Wait two hours give the dose of tylenol. Wait four hours and give the next dose of motrin. My son has had a lot of ear infections every time he got teeth in and this is what the doctors have told me to do.