hi there thank you for your query firstly I would like to know why did you start taking Tylenol PM what problems you were having? Tylenol PM contains paracetamol and diphenhydramine and is given to treat common colds and flu fever and pains how long have you been taking this tablet? Stop using the medicine and call your doctor at once if you have: fast, pounding, or uneven heartbeats; severe dizziness or drowsiness, slow or shallow breathing; tremor, restless muscle movements; little or no urinating; flu symptoms, easy bruising, unusual bleeding, pale skin, feeling light-headed; or nausea, pain in your upper stomach pain, itching, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes). Common side effects may include: constipation; dry eyes, blurred vision, dry mouth or nose; mild dizziness or drowsiness, trouble concentrating; feeling restless or excited (especially in children); or mild skin rash.