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Methadone is available as a tablet, liquid, or an injection.
Methadone works on parts of the brain and spinal cord to block the "high" caused by using opiates (such as heroin). It also helps reduce cravings and withdrawal symptoms caused by opiate use. The action of methadone is similar to other synthetic (man-made) medicines in the morphine category (opioids). Substances that are derived directly from the opium plant (such as heroin, morphine, and codeine) are known as opiates.
Methadone is commonly used to treat addiction to opiates (such as heroin). Taken once a day, methadone eases opiate withdrawal for 24 to 36 hours, decreasing the chance of relapse.
As a treatment for opiate addiction, methadone reduces the cravings and withdrawal symptoms caused by opiate use by blocking the "high" and preventing the intense euphoric rush of these drugs. This effect allows people to avoid the physical and psychological highs and lows caused by changing levels of opiates in the blood, decreasing the chance of relapse. In some cases of opiate addiction, methadone treatment may be needed for several years or longer.
All medicines have side effects. But many people don't feel the side effects, or they are able to deal with them. Ask your pharmacist about the side effects of each medicine you take. Side effects are also listed in the information that comes with your medicine.
Here are some important things to think about:
Call 911 or other emergency services right away if you have:
Call your doctor if you have:
Common side effects of this medicine include:
See Drug Reference for a full list of side effects. (Drug Reference is not available in all systems.)
Methadone is a long-acting medicine, and each dose stays in the body for a long time. For this reason, dosages should be adjusted with caution, ideally by an addiction specialist. It may take a couple of days after the medicine is started before the dose of methadone is fully effective.
In some people methadone impairs balance, coordination, or the ability to think. Do not drive or operate any type of equipment if you are taking methadone.
Do not drink alcohol or use other drugs while you are taking methadone.
Medicine is one of the many tools your doctor has to treat a health problem. Taking medicine as your doctor suggests will improve your health and may prevent future problems. If you don't take your medicines properly, you may be putting your health (and perhaps your life) at risk.
There are many reasons why people have trouble taking their medicine. But in most cases, there is something you can do. For suggestions on how to work around common problems, see the topic Taking Medicines as Prescribed.
If you are pregnant, breast-feeding, or planning to get pregnant, do not use any medicines unless your doctor tells you to. Some medicines can harm your baby. This includes prescription and over-the-counter medicines, vitamins, herbs, and supplements. And make sure that all your doctors know that you are pregnant, breast-feeding, or planning to get pregnant.
Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments, and call your doctor if you are having problems. It's also a good idea to know your test results and keep a list of the medicines you take.
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