Possible side effects of Tylenol include feeling unusually weak or tired, pinpoint red spots on the skin, decreased urine quantities, and sharp or severe pain in the side or lower back, according to Drugs.com. Other possible side effects include unusual bleeding or bruising, or urine that is cloudy or bloody.
After taking Tylenol, some people may experience a sore throat or fever that is unrelated to the condition being treated, notes Drugs.com. The fever may or may not also include the chills. Tylenol may cause the skin or eyes to turn yellow. Some people may experience itchiness, hives or a rash on the skin after taking Tylenol. Some people may have white spots, sores or ulcers near their mouth and lips after taking Tylenol. If side effects do occur, it is important to speak to a physician right away.
It is possible to overdose on Tylenol, states Drugs.com. Signs of an overdose include pain or cramping in the stomach, loss of appetite, nausea and vomiting. Other signs of an overdose include excessive sweating, diarrhea and tenderness, and swelling or pain in the stomach or upper abdomen.
The active ingredient in Tylenol, acetaminophen, is usually tolerated when it is used in proper doses. If an overdose occurs, it is important to seek medical attention immediately.