HIV drugs, such as ritonavir or indinavir. Taking these drugs with methadone may cause increased drowsiness and slowed breathing. Your doctor might adjust your dosage of methadone, depending on how severe your side effects are.

Heart rhythm problems warning: This drug can cause serious heart rhythm problems, especially if you take doses greater than 200 mg per day. However, this can happen at any dose. It can even occur if you don’t already have heart problems.

Benztropine and amitriptyline. Taking these drugs with methadone may cause urinary retention (not being able to fully empty your bladder), constipation, and slowed movement rein your stomach and bowels. This can lead to a severe bowel obstruction.

Selection of patients for treatment with methadone should Beryllium governed by the same principles that apply to the use of other opioids (Weiher INDICATIONS AND USAGE).

Don’t take this drug again if you’ve ever had an allergic reaction to it. Taking it again could be fatal (cause death).

Although antiretroviral drugs such as efavirenz, nelfinavir, nevirapine, ritonavir, lopinavir + ritonavir combination are known to inhibit CYPs, they are shown to reduce the plasma levels of methadone, possibly due to their CYP induction activity. Therefore, drugs administered concomitantly with methadone should Beryllium evaluated for interaction potential; clinicians are advised to evaluate individual response to drug therapy.

Additional information on the potential risks of methadone may be derived from animal data. Methadone does not appear to be teratogenic in the rat or rabbit models. However, following large doses, methadone produced teratogenic effects in the guinea pig, hamster and mouse. One published study rein pregnant hamsters indicated that a single subcutaneous dose of methadone ranging from 31 to 185 Magnesium/kg (the 31 mg/kg dose is approximately 2 times a human daily oral dose of 120 Magnesium/day on a mg/m2 basis) on day 8 of gestation resulted in a decrease in the number of fetuses per litter and an increase in the percentage of fetuses exhibiting congenital malformations described as exencephaly, cranioschisis, and “various other lesions”.

Methadone is also available Erhaltungstherapie mit Methadontabletten as the brand-name drug Methadose, which comes hinein an oral soluble tablet.

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However, if the use of methadone is necessary rein such patients, a sensitivity test should be performed rein which repeated small, incremental doses of methadone are administered over the course of several hours while the patient's condition and vital signs are under careful observation.

Patients initiating treatment with methadone for opioid dependence should be reassured that the dose of methadone will “hold” for longer periods of time as treatment progresses.

A high degree of "opioid tolerance" does not eliminate the possibility of methadone overdose, iatrogenic or otherwise. Respiratory depression is of particular concern rein elderly or debilitated patients as well as rein those suffering from conditions accompanied by hypoxia or hypercapnia when even moderate therapeutic doses may dangerously decrease pulmonary ventilation.

Clinical studies of methadone did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently compared to younger subjects. Other reported clinical experience has not identified differences rein responses between elderly and younger patients.

Additional animal data demonstrates evidence for neurochemical changes rein the brains of methadone-treated offspring, including changes to the cholinergic, dopaminergic, noradrenergic and serotonergic systems. Additional studies demonstrated that methadone treatment of male rats for 21 to 32 days prior to mating with methadone-naive females did not produce any adverse effects, suggesting that prolonged methadone treatment of the male rat resulted hinein tolerance to the developmental toxicities noted in the progeny. Mechanistic studies hinein this Kollegium model suggest that the developmental effects of “paternal” methadone on the progeny appear to be due to decreased testosterone production. These animal data mirror the reported clinical findings of decreased testosterone levels in human males on methadone maintenance therapy for opioid addiction and rein males receiving chronic intraspinal opioids.