Methadone Side Effects

Published on March 26th, 2014

When addicted to opiates finding a way out can be difficult without medication assistance. This is because the symptoms of withdrawal can cause extreme physical and psychological pain, often sending the individual back to their substance of choice for comfort. To stop this repetitive cycle you have options, however they do not come without their own risks.

Methadone is a popular choice amongst those suffering from opioid addiction and their Doctors. It is used as a pain reliever and as part of drug addiction detoxification and maintenance programs, successfully helping hundreds of thousands of people overcome opiate addiction.

What is Methadone?

Methadone is a synthetic opioid analgesic similar to morphine. It is a strong medication that is used to treat severe pain and in detoxification from and maintenance after addiction to narcotics. It’s ingredients are methadone hydrochloride, lactose monohydrate, magnesium stearate, microcrystalline cellulose and silicon dioxide. Methadone is available in tablet form in 5 mg or 10 mg doses. It is available by prescription or within clinics designed for the treatment of opiate addictions.


Due to the ingredients in methadone there is contraindicated in people who are sensitive or allergic to the medication or any of its ingredients. If you have respiratory problems, asthma or hypercarbia, or have paralytic ileus, then you should not use this medication.

Common Side Effects

  • Anxiety
  • Nervousness
  • Restlessness
  • Sleep problems (insomnia)
  • Weakness
  • Drowsiness
  • Dry mouth
  • Nausea
  • Vomiting
  • Diarrhea
  • Constipation
  • Loss of appetite
  • Decreased sex drive
  • Impotence
  • Difficulty having an orgasm
  • Absent, missed, or irregular menstrual periods
  • Blurred or loss of vision
  • Confusion about identity, place, and time
  • Constipation
  • Disturbed color perception
  • Double vision
  • False or unusual sense of well-being
  • Halos around lights
  • Night blindness
  • Redness, swelling, or soreness of the tongue
  • Weight changes

Contact Your Doctor Immediately if You Experience any of the following side effects to Methadone:

  • Black, tarry stools
  • bleeding gums
  • blood in the urine or stools
  • bulging soft spot on the head of an infant
  • changes in skin color
  • chest discomfort or pain
  • convulsions
  • decreased urine output
  • difficult or troubled breathing
  • difficulty swallowing
  • dilated neck veins
  • fast, slow, or irregular heartbeat
  • hives
  • numbness or tingling in the hands, feet, or lips
  • pale or blue lips, fingernails, or skin
  • pinpoint red spots on the skin
  • seizures
  • skin rash
  • swelling of the face, fingers, feet, or lower legs
  • trouble in urinating
  • unusual bleeding or bruising



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