Hello, welcome to Healthcaremagic. Tylenol
. Symptoms from an overdose of acetaminophen typically appear after 24 hours, or in some cases up to 48 hours; however, getting immediate treatment prior to symptoms occurring, can greatly improve the outcome, so you must immediately report to the hospital. Typical symptoms range from nausea and malaise to extreme upper abdominal pain
in the region of the liver. The antidote to acetaminophen overdose, N-acetylcysteine
(NAC), is most effective when taken within eight-hours of an overdose. Wish you good health.