METHADONE HYDROCHLORIDE- methadone hydrochloride tablet 
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Methadone hydrochloride is:

  • A strong prescription pain medicine that contains methadone, an opioid (narcotic) that is used to treat moderate to severe around-the-clock pain.
  • Used to manage drug addiction.

Important information about methadone hydrochloride:

  • Get emergency help right away if you take too much methadone hydrochloride (overdose). Methadone hydrochloride overdose can cause life threatening breathing problems that can lead to death.
  • Never give anyone else your methadone hydrochloride. They could die from taking it. Store methadone hydrochloride away from children and in a safe place to prevent stealing or abuse. Selling or giving away methadone hydrochloride is against the law.

Do not take methadone hydrochloride if you have:

  • Severe asthma, trouble breathing, or other lung problems.
  • A bowel blockage or have narrowing of the stomach or intestines.

Before taking methadone hydrochloride, tell your healthcare provider if you have a history of:

  • head injury, seizures
  • heart, liver, kidney, thyroid problems
  • problems urinating
  • pancreas or gallbladder problems
  • abuse of street or prescription drugs, alcohol addiction, or mental health problems.

Tell your healthcare provider if you are:

  • pregnant or planning to become pregnant. Methadone hydrochloride may harm your unborn baby.
  • breastfeeding. Methadone hydrochloride passes into breast milk and may harm your baby.
  • taking prescription or over-the-counter medicines, vitamins, or herbal supplements.

When taking methadone hydrochloride:

  • Do not change your dose. Take methadone hydrochloride exactly as prescribed by your healthcare provider.
  • Do not take more than your prescribed dose in 24 hours. If you take methadone hydrochloride for pain and miss a dose, take methadone hydrochloride as soon as possible and then take your next dose 8 or 12 hours later as directed by your healthcare provider. If it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule.
  • If you take methadone hydrochloride for opioid addiction, take your next dose the following day as scheduled. Do not take extra doses. Taking more than the prescribed dose may cause you to overdose because methadone hydrochloride builds up in your body over time.
  • Call your healthcare provider if the dose you are taking does not control your pain.
  • Do not stop taking methadone hydrochloride without talking to your healthcare provider.
  • After you stop taking methadone hydrochloride, flush any unused tablets down the toilet.

While taking methadone hydrochloride Do Not:

  • Drive or operate heavy machinery, until you know how methadone hydrochloride affects you. Methadone hydrochloride can make you sleepy, dizzy, or lightheaded.
  • Drink alcohol or use prescription or over-the-counter medicines that contain alcohol.

The possible side effects of methadone hydrochloride are:

  • constipation, nausea, sleepiness, vomiting, tiredness, headache, dizziness. Call your healthcare provider if you have any of these symptoms and they are severe.

Get emergency medical help if you have:

  • trouble breathing, shortness of breath, fast heartbeat, chest pain, swelling of your face, tongue or throat, extreme drowsiness, or you are feeling faint.

These are not all the possible side effects of methadone hydrochloride. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088. For more information go to

Manufactured by: Roxane Laboratories, Inc., Columbus, Ohio 43216,, or call 1-800-962-8364

This Medication Guide has been approved by the U.S. FDA. Issue: July 2012


Revised: 10/2020
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