Tylenol-Codeine (Acetaminophen and Codeine) Overview

What is Tylenol with Codeine?

Tylenol with Codeine is a prescription combination pain medicine. Acetaminophen provides non-opioid pain relief, while codeine is converted partly to morphine in the body and acts on opioid receptors.

The current US labeling cited here describes tablets containing acetaminophen 300 mg and codeine phosphate 30 mg. Other acetaminophen-codeine products and strengths exist, so the prescription label must be checked rather than assuming that all tablets are equivalent.

What is it used for?

The FDA-approved indication is the management of mild to moderate pain where an opioid is appropriate and alternative treatments are inadequate. Because codeine can cause dependence, overdose and fatal respiratory depression, the product should be reserved for situations in which non-opioid options are not sufficient or are not expected to be sufficient.

Dosage and administration

For the 300 mg/30 mg tablet in the cited labeling, the initial adult dosage is one or two tablets every four hours as needed for pain. The prescriber should use the lowest effective dose for the shortest duration consistent with treatment goals.

Do not increase the dose, take it more often or continue it longer than prescribed. Total acetaminophen from all prescription and non-prescription products must be counted. The label warns that doses above 4,000 mg a day have been associated with acute liver failure, often when more than one acetaminophen-containing product was used.

People with liver or kidney impairment, older or frail adults, and those with breathing problems may require a lower dose, a longer interval or a different treatment.

Boxed warnings and major risks

Addiction, misuse and accidental ingestion

Codeine is an opioid and a controlled substance. Even when taken as prescribed, repeated use can lead to physical dependence. Misuse can cause overdose or death. Store tablets securely and never share them. A single accidental ingestion can be fatal, especially in a child.

Life-threatening respiratory depression

Serious, life-threatening or fatal breathing suppression can occur, particularly when treatment starts or the dose increases. Seek emergency help if breathing becomes slow or shallow, the lips appear blue or grey, or the person is unusually difficult to wake.

Ultra-rapid metabolism of codeine

Some people convert codeine to morphine more rapidly because of CYP2D6 genetic variation. This can produce unexpectedly high morphine concentrations and fatal respiratory depression. The risk cannot be identified reliably from the dose alone.

Liver injury from acetaminophen

Acetaminophen overdose can cause acute liver failure, transplantation or death. Check labels for “acetaminophen” or “APAP,” and do not use another acetaminophen product unless a clinician or pharmacist has confirmed the total dose is safe.

Who should not take it?

The product is contraindicated in:

• children younger than 12 years;
• children younger than 18 years after tonsillectomy or adenoidectomy;
• people with significant respiratory depression;
• people with acute or severe bronchial asthma in an unmonitored setting;
• known or suspected gastrointestinal obstruction, including paralytic ileus;
• people allergic to acetaminophen, codeine or another ingredient;
• people using an MAOI or who used one within the previous 14 days.

The FDA also recommends avoiding codeine in adolescents aged 12 to 18 who have risk factors for serious breathing problems, including obstructive sleep apnoea, obesity, severe lung disease or neuromuscular disease.

Interactions

Alcohol, benzodiazepines and other sedatives

Combining codeine with alcohol, benzodiazepines, sleep medicines, other opioids, muscle relaxants, sedating antihistamines or other central nervous system depressants can cause profound sedation, respiratory depression, coma and death. Use together only when specifically managed by a prescriber.

CYP2D6 and CYP3A4 interactions

Medicines that inhibit or induce CYP2D6 or CYP3A4 can alter codeine and morphine exposure. Starting or stopping one of these interacting medicines can change both pain control and overdose risk, so the combination requires clinical review.

Serotonergic medicines

Serotonin syndrome has been reported when opioids are used with serotonergic medicines. Seek urgent advice for agitation, hallucinations, fever, sweating, muscle rigidity, poor coordination, diarrhoea or a rapid heartbeat.

Common side effects

• drowsiness or dizziness;
• nausea and vomiting;
• constipation;
• light-headedness;
• abdominal discomfort.

Do not drive or operate machinery until you know how the medicine affects you. Persistent constipation may need preventive treatment; ask the prescriber or pharmacist.

Pregnancy, labour and breastfeeding

Pregnancy

Prolonged opioid use during pregnancy can cause neonatal opioid withdrawal syndrome, which can be life-threatening if not recognised and treated. Use in pregnancy requires an individual medical assessment of benefits and risks.

Labour and delivery

Opioids cross the placenta and can cause respiratory depression in a newborn. The product is not recommended for use immediately before labour when shorter-acting alternatives or other techniques are more appropriate.

Breastfeeding

FDA labeling advises that breastfeeding is not recommended during treatment with Tylenol with Codeine. Codeine and morphine can pass into breast milk, and ultra-rapid metabolism may expose an infant to dangerously high morphine levels.

Overdose and naloxone

An overdose can involve both opioid toxicity and delayed acetaminophen liver injury. Call emergency services immediately for very slow breathing, inability to wake, pinpoint pupils, limpness, vomiting, confusion or suspected excess dosing—even if the person initially feels well.

Discuss access to naloxone with the prescriber or pharmacist, particularly when overdose risk factors are present. Naloxone can temporarily reverse opioid respiratory depression, but emergency help is still required because its effect may wear off before the codeine effect does.

Can you take regular Tylenol with codeine?

Do not add regular Tylenol or another acetaminophen-containing product unless a clinician or pharmacist has calculated the total daily acetaminophen dose and confirmed it is appropriate. Accidental duplication is a common route to overdose.

How does it differ from other opioid combinations?

Tylenol with Codeine contains codeine, whereas Percocet combines oxycodone with acetaminophen. They have different opioid ingredients, potencies, dosing and risks and should never be substituted tablet-for-tablet.

Stopping treatment

Do not stop suddenly after regular extended use without medical advice. A gradual taper may be needed to reduce withdrawal symptoms. Physical dependence is not the same as opioid use disorder, but both require appropriate clinical management.

Official sources

• DailyMed: Tylenol with Codeine prescribing information
• FDA: restrictions on codeine use in children and breastfeeding
• FDA: acetaminophen in prescription combination products and liver injury

This article provides general information and does not replace the Medication Guide, prescribing information or advice from a healthcare professional.