All medicines may cause side effects, but many people have no, or minor, side effects
. When used in small doses, no COMMON side effects
have been reported with Tylenol. Seek medical attention right away if any of these SEVERE side effects occur when using Tylenol:
"Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); dark urine or pale stools; unusual fatigue; yellowing of the skin or eyes.