Side Effects

What are the side effects of Tylenol (Acetaminophen (Injection))?

Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

In rare cases, acetaminophen may cause a severe skin reaction that can be fatal, even if you took acetaminophen in the past and had no reaction. Stop taking this medicine and call your doctor right away if you have skin redness or a rash that spreads and causes blistering and peeling.

Stop taking acetaminophen and call your doctor at once if you have signs of liver problems:

stomach pain (upper right side);
loss of appetite;
tiredness, itching;
dark urine, clay-colored stools; or
jaundice (yellowing of the skin or eyes).

Less serious side effects may be more likely, and you may have none at all.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Dosage Guidelines & Tips

How to take Tylenol (Acetaminophen (Injection))?

Use Tylenol (Acetaminophen (Injection)) exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.

Use exactly as directed on the label, or as prescribed by your doctor. An acetaminophen overdose can damage your liver or cause death.

Adults and teenagers at least 12 years old: Do not take more than 1000 milligrams (mg) at one time or more than 4000 mg in 24 hours.
Children younger than 12 years old: Do not take more than 5 doses of children's formula acetaminophen in 24 hours.

Do not give extra-strength acetaminophen to a child younger than 12 years old without medical advice.

A child's dose is based on age and weight. Carefully follow the dosing instructions provided with this medicine. Ask a doctor before giving this medicine to a child younger than 2 years.

Acetaminophen made for infants comes with its own medicine dropper or oral syringe. Measuring with the wrong device may cause an overdose. Use only the provided dosing device provided to measure an infant's dose.

Acetaminophen comes in many different forms such as capsules, liquid, chewable or disintegrating tablets, and dissolving powders or granules. Read and carefully follow any Instructions for Use provided with your medicine. Ask your doctor or pharmacist if you need help.

Stop taking acetaminophen and call your doctor if:

you still have a sore throat after 2 days of use;
you still have a fever after 3 days of use;
you still have pain after 7 days of use (or 5 days if treating a child);
you have a skin rash, ongoing headache, nausea, vomiting, redness or swelling; or
your symptoms get worse, or if you have any new symptoms.

Taking acetaminophen may cause false results with certain blood glucose monitors. If you have diabetes, ask your doctor about the best way to monitor your blood sugar levels while using acetaminophen.

Store at room temperature away from heat and moisture.

What should I do if I missed a dose of Tylenol (Acetaminophen (Injection))?

Acetaminophen is used when needed. If you are on a dosing schedule, skip any missed dose. Do not use two doses at one time.