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.
Soon after taking an overdose of acetaminophen, the person may have no symptoms from taking a toxic amount. They may remain symptom free for up to 24 hours after taking a toxic overdose of acetaminophen. After this initial period, the following symptoms are common in acetaminophen (Tylenol) poisoning: 1  Nausea.  Vomiting.