Acetaminophen is a pain reliever and a fever reducer.

Acetaminophen is used to treat many conditions such as headache, muscle aches, arthritis, backache, toothaches, colds, and fevers.

Acetaminophen may also be used for purposes other than those listed in this medication guide.

Take acetaminophen exactly as directed by your doctor or follow the instructions on the package. If you do not understand these instructions, ask your pharmacist, nurse, or doctor to explain them to you.

Take each oral dose with a full glass of water.

Acetaminophen can be taken with or without food.

Wash your hands before and after using the rectal suppositories. Run the suppository under cold water or put it in the refrigerator for a few minutes before using it. Remove any wrapping from the suppository and moisten the suppository with cold water. Squat, stand, or lie down with one leg straight and the other bent, in a comfortable position that allows access to the rectal area. Use your finger, or the applicator if one is provided, to deposit the suppository as far as it will comfortably go into the rectum. Insert the narrow end first. Close your legs and lie still for a few minutes. If the applicator will be reused, take it apart and wash it with warm water and mild soap, then dry it completely. Avoid having a bowel movement for at least 1 hour after inserting the suppository.

To ensure that you get a correct dose, measure the liquid forms of acetaminophen with a special dose-measuring spoon or cup, not with a regular table spoon. If you do not have a dose-measuring device, ask your pharmacist where you can get one. Shake the liquid well before measuring.

Never take more acetaminophen than is directed. The maximum amounts for adults are 1 gram (1000 mg) per dose and 4 grams (4000 mg) per day. Taking more acetaminophen could be damaging to the liver. If you drink more than three alcoholic beverages per day, talk to your doctor before taking acetaminophen.

Use acetaminophen for up to 3 days for fever or up to 10 days for pain (or up to 5 days to treat a child’s pain). If the symptoms do not improve, or if they get worse, stop using acetaminophen and see a doctor.

If you are treating a child, read the package carefully and use a pediatric form of the medication if possible. Talk to a doctor first if the child is younger than 2 years of age.

Store acetaminophen at room temperature away from heat, moisture, and the reach of children. The rectal suppositories can be stored at room temperature or in the refrigerator.

Be aware of the acetaminophen content of other over-the-counter and prescription products. Care should be taken to avoid taking more than the recommended amount of acetaminophen per dose or per day.

Acetaminophen may cause false urine glucose test results. Talk to your doctor if you have diabetes and you notice changes in your glucose levels while taking acetaminophen.

Other medications may interact with acetaminophen. Talk to your doctor and pharmacist before taking any prescription or over-the-counter medicines, including herbal products while taking acetaminophen.

Avoid alcohol during treatment with acetaminophen. Together, alcohol and acetaminophen can be damaging to the liver.

Be aware of the acetaminophen content of other over-the-counter and prescription products. Care should be taken to avoid taking more than the recommended amount of acetaminophen per dose or per day.

Seek emergency medical attention.

Symptoms of an acetaminophen overdose include nausea, vomiting, diarrhea, abdominal pain, sweating, seizures, confusion, and an irregular heartbeat.

If you are taking acetaminophen on a regular schedule, take the missed dose as soon as you remember. Wait the prescribed amount of time or as directed in the package labeling before taking another dose. Do not take a double dose.

If you are taking acetaminophen on an as-needed basis, missing a dose is not usually a problem. Take the dose as soon as you remember, and do not take another dose for the amount of time prescribed or as directed in the package labeling.

Use acetaminophen for up to 3 days for fever or up to 10 days for pain (or up to 5 days to treat a child’s pain). If the symptoms do not improve, or if they get worse, stop using acetaminophen and see a doctor.

Avoid alcohol during treatment with acetaminophen. Together, alcohol and acetaminophen can be damaging to the liver.

Be aware of the acetaminophen content of other over-the-counter and prescription products. Care should be taken to avoid taking more than the recommended amount of acetaminophen per dose or per day.

Do not take acetaminophen without first talking to your doctor if you drink more than three alcoholic beverages per day or if you have had alcoholic liver disease. You may not be able to take acetaminophen, or you may require a lower dose or special monitoring.

Before taking acetaminophen, tell your doctor if you have kidney or liver disease. You may not be able to take acetaminophen, or you may require a dosage adjustment or special monitoring during treatment if you have either of these conditions.

Acetaminophen has not been formally assigned to a pregnancy category by the FDA. It is routinely used for short term pain relief and fever in all stages of pregnancy. Acetaminophen is believed to be safe in pregnancy when used intermittently for short durations. Acetaminophen should only be given during pregnancy when need has been clearly established.

Acetaminophen passes into breast milk. It appears to be safe for use during breast-feeding but should be avoided if possible. Talk to your doctor before taking acetaminophen if you are breast-feeding a baby.

If you are treating a child, read the package carefully and use a pediatric form of the medication if possible. Talk to a doctor first if the child is younger than 2 years of age.

Your pharmacist has additional information about acetaminophen written for health professionals that you may read.

Many formulations of acetaminophen are available alone and in combination products. Ask your pharmacist any questions you have about this medication, especially if it is new to you.