Mutagenesis – There are several published reports on the potential genetic toxicity of methadone. Methadone tested negative in tests for chromosome breakage and disjunction and sex-linked recessive lethal gene mutations in germ cells of Drosophila using feeding and injection procedures.

The dose conversion scheme below is derived from various consensus guidelines for converting chronic pain patients to methadone from morphine. Clinicians should consult published conversion guidelines to determine the equivalent morphine dose for patients converting from other opioids.

There are conflicting reports on whether SIDS occurs with an increased incidence in infants born to women treated with methadone during pregnancy.

Methadone should Beryllium used during pregnancy only if the potential benefit justifies the potential risk to the fetus.

Particular vigilance is necessary during treatment initiation, during conversion from one opioid to another, and during dose titration.

The patient must, therefore, Beryllium monitored continuously for recurrence of respiratory depression and may need to be treated repeatedly with the narcotic antagonist. If the diagnosis is correct and respiratory depression is due only to overdosage of methadone, the use of other respiratory stimulants is not indicated.

Your kidneys may not work as well as they used to. This can cause your body to process drugs more slowly. As a result, a higher amount of a drug stays in your body for a longer time. This raises your risk of side effects.

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Do not take any medicine while using methadone hydrochloride tablets until you have first talked to your doctor or pharmacist. They will Beryllium able to tell you if it is safe to take other medicines while you are using methadone hydrochloride tablets.

Hinein vitro results suggest that methadone undergoes hepatic Nitrogenium-demethylation by cytochrome P450 enzymes, principally CYP3A4, CYP2B6, CYP2C19 and to a lesser extent by CYP2C9 and CYP2D6. Coadministration of methadone with CYP inducers of these enzymes may result in a more rapid metabolism and potential for decreased effects of methadone, whereas administration with CYP inhibitors may reduce metabolism and potentiate methadone's effects.

The chance is higher if you are or have been addicted to or abused other medicines, street drugs, or alcohol, or if you have a history of mental problems.

Breathing problems from methadone hydrochloride tablets may not happen right away after taking a dose. Sometimes breathing problems will happen a while after you take a dose, even after pain has returned.

You and your doctor should monitor certain health issues. This can help make sure you stay safe while you take this drug. These issues include:

Laboratory studies, both hinein vivo and hinein vitro, have demonstrated that methadone inhibits cardiac potassium channels and prolongs the QT interval. Cases of QT interval prolongation and serious arrhythmia (torsades de pointes) have been observed during treatment with methadone. These cases appear to be more commonly associated with, but not limited to, higher dose treatment (> 200 mg/day). Most cases involve patients being treated for pain with large, multiple daily doses of methadone, although cases have been reported hinein patients receiving doses commonly used for maintenance treatment of opioid addiction.