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 just saw that I was not supposed to have any ibuprofen for at least 7 days prior to my surgery. No one mentioned this while going over anything. I had my period last week and took ibuprofen and tylenol to help with the pain. The last time I took it was Thursday, which will be 5 days before my surgery.