Codeine-acetaminophen

Opioids and strong painkillers

Also known as Tylenol with Codeine

This combines codeine, a milder opioid, with acetaminophen (the medicine in Tylenol) to relieve moderate pain. Your body converts codeine into morphine to make it work. Here's the important part: some people's bodies make that conversion ultra-fast, which can push levels dangerously high — that's why it must never be given to children under 12, or to anyone under 18 after tonsil or adenoid surgery. Even as a milder opioid, it can be habit-forming, so take it exactly as prescribed.

How to take it

When

Take it exactly as prescribed — never extra, never closer together. It starts working in about 30 to 60 minutes. If you've taken it regularly, don't stop suddenly — ask your doctor about tapering to avoid withdrawal.

Food

Take it with food or milk if it upsets your stomach. And count the acetaminophen: never add extra Tylenol or combination cold and flu medicines on top — too much acetaminophen can seriously damage your liver.

Avoid

Never mix with alcohol, benzodiazepines (like Xanax or Klonopin), or other sedatives — the combination can stop your breathing. Never give it to a child under 12, or to anyone under 18 after tonsil or adenoid surgery. Don't breastfeed while taking it — dangerous amounts can pass to the baby through milk. Don't drive until you know how it affects you.

Keep it safe

Lock it away from children and teens — a single dose can be fatal to a child. Never share it (it's illegal and dangerous), and take leftovers to a pharmacy take-back. Ask your doctor or pharmacist about keeping naloxone (Narcan) at home — the FDA recommends it for everyone taking opioids. If you're pregnant, tell your doctor — a baby can be born in withdrawal.

Missed a dose?

If you take it on a schedule and miss a dose, take it when you remember unless the next dose is close — then skip it. If you take it only as needed for pain, there's no missed dose to worry about. Never double up.

Common side effects

Constipation — very common with opioids, so be proactive: fluids, fiber, and ask about a stool softener
Drowsiness
Nausea or an upset stomach
Dizziness or lightheadedness
Feeling slowed-down or foggy

Call a doctor if

Very slow, shallow, or stopped breathing, gurgling or snoring sounds, blue lips or fingertips, or someone who can't be woken — this is an overdose. Give naloxone if you have it and call 911 immediately
A child or breastfed baby who is unusually sleepy, limp, hard to feed, or breathing strangely — call 911. This can mean a dangerous codeine reaction
Extreme drowsiness, confusion, or trouble staying awake in an adult — call your doctor right away; slowed breathing can follow
Yellowing skin or eyes, dark urine, or upper right belly pain — possible liver damage from the acetaminophen; get medical help now
Hives or swelling of your face, lips, or throat — call 911 if breathing is affected

Educational only. This summary is drawn from public FDA labeling and MedlinePlus and simplified for readability. Your prescription label and your pharmacist always come first — doses and instructions vary from person to person.