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.
In this instance, it's okay to give acetaminophen a try now. In fact, because you can't give her ibuprofen again for six to eight hours after the first dose, it may be helpful to try a new tack. If the acetaminophen does the trick, your child won't need any medication at all for another six to eight hours. It's not a good idea, though, to get in the habit of giving your child alternating doses of ibuprofen and acetaminophen, because ongoing alternating doses can be hard on the kidneys.