Highlights for methadone
methadone Side Effects
Side effects that you should report to your doctor or health care professional as soon as possible:
- allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
- breathing problems
- chest pain
- feeling faint or lightheaded, falls
- loud snoring
- unusually fast or slow heartbeat
- unusually weak or tired
Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):
- nausea, vomiting
methadone May Interact with Other Medications
Do not take this medicine with any of the following medications:
- arsenic trioxide
- certain antibiotics like clarithromycin, erythromycin, grepafloxacin, pentamidine, sparfloxacin, troleandomycin
- certain medicines for fungal infections like fluconazole, itraconazole, ketoconazole, posaconazole, voriconazole
- certain medicines for irregular heart beat like amiodarone, bretylium, disopyramide, dofetilide, dronedarone, procainamide, quinidine, sotalol
- certain medicines for malaria like chloroquine, halofantrine
This medicine may also interact with the following medications:
- antihistamines for allergy, cough and cold
- antiviral medicines for HIV or AIDS
- certain antibiotics like gatifloxacin, gemifloxacin, levofloxacin, moxifloxacin, ofloxacin, telithromycin, rifampin, rifapentine
- certain medicines for blood pressure
- certain medicines for cancer like dasatinib, lapatinib, sunitinib
- certain medicines for depression, anxiety, or psychotic disturbances
- certain medicines for irregular heart beat like flecainide, propafenone
- certain medicines for nausea or vomiting like dolasetron, ondansetron, palonosetron
- certain medicines for seizures like carbamazepine, phenobarbital, phenytoin
- certain medicines for sleep
- certain medicines for sleep during surgery
- certain medicines to numb the skin
- MAOIs like Carbex, Eldepryl, Marplan, Nardil, and Parnate
- muscle relaxants
- narcotic medicines for pain
- other medicines that prolong the QT interval (cause an abnormal heart rhythm)
- peginterferon alfa-2b
- phenothiazines like chlorpromazine, mesoridazine, prochlorperazine
- St. John's wort
How to Use methadone
Take this medicine by mouth with a drink of water. If the medicine upsets your stomach, take it with food or milk. Follow the directions on the prescription label. Do not take more medicine than you are told to take.
A special MedGuide will be given to you by the pharmacist with each prescription and refill. Be sure to read this information carefully each time.
Talk to your pediatrician regarding the use of this medicine in children. Special care may be needed.
They need to know if you have any of these conditions:
- adrenal gland problem (Addison's disease)
- brain tumor
- drug abuse or addiction
- fast or irregular heartbeat
- gallbladder disease
- head injury
- frequently drink alcohol-containing drinks
- kidney disease or problems going to the bathroom
- liver disease
- low blood pressure
- lung disease, asthma, COPD, or sleep apnea
- mental problems
- seizure disorder
- thyroid disease
- an unusual or allergic reaction to methadone, other opioid analgesics, other medicines, foods, dyes, or preservatives
- pregnant or trying to get pregnant
If you miss a dose, take it as soon as you can. If it is almost time for your next dose, take only that dose. Do not take double or extra doses.
Tell your doctor or health care professional if your pain does not go away, if it gets worse, or if you have new or a different type of pain. You may develop tolerance to the medicine. Tolerance means that you will need a higher dose of the medicine for pain relief. Tolerance is normal and is expected if you take this medicine for a long time.
Talk to your family and the people you live with about the side effects of this medicine. Tell them to get you medical help right away if you are having trouble breathing, unusually loud snoring, or are too sleepy.
Do not suddenly stop taking your medicine because you may develop a severe reaction. Your body becomes used to the medicine. This does NOT mean you are addicted. Addiction is a behavior related to getting and using a drug for a non-medical reason. If you have pain, you have a medical reason to take pain medicine. Your doctor will tell you how much medicine to take. If your doctor wants you to stop the medicine, the dose will be slowly lowered over time to avoid any side effects.
You may get drowsy or dizzy when you first start taking this medicine or change doses. Do not drive, use machinery, or do anything that may be dangerous until you know how the medicine affects you. Stand or sit up slowly.
There are different types of narcotic medicines (opiates) for pain. If you take more than one type at the same time, you may have more side effects. Give your health care provider a list of all medicines you use. Your doctor will tell you how much medicine to take. Do not take more medicine than directed. Call emergency for help if you have problems breathing.
This medicine will cause constipation. Try to have a bowel movement at least every 2 to 3 days. If you do not have a bowel movement for 3 days, call your doctor or health care professional.
Your mouth may get dry. Chewing sugarless gum or sucking hard candy, and drinking plenty of water may help. Contact your doctor if the problem does not go away or is severe.
Keep out of the reach of children. This medicine can be abused. Keep your medicine in a safe place to protect it from theft. Do not share this medicine with anyone. Selling or giving away this medicine is dangerous and is against the law.
Store at room temperature between 15 and 30 degrees C (59 and 86 degrees F). Keep container tightly closed.
This medicine may cause accidental overdose and death if it is taken by other adults, children, or pets. Flush any unused medicine down the toilet to reduce the chance of harm. Do not use the medicine after the expiration date.
Last Updated: July 22, 2014