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(methadone hydrochloride) Oral Tablets, USP
ABUSE POTENTIAL, LIFE-THREATENING RESPIRATORY DEPRESSION, LIFE-THREATENING QT PROLONGATION, ACCIDENTAL EXPOSURE, and TREATMENT FOR OPIOID ADDICTION
Methadose contains methadone, an opioid agonist and Schedule II controlled substance with an abuse liability similar to other opioid agonists, legal or illicit [see WARNINGS AND PRECAUTIONS]. Assess each patient's risk for opioid abuse or addiction prior to prescribing Methadose. The risk for opioid abuse is increased in patients with a personal or family history of substance abuse (including drug or alcohol abuse or addiction) or mental illness (e.g., major depressive disorder). Routinely monitor all patients receiving Methadose for signs of misuse, abuse, and addiction during treatment [see Drug Abuse and Dependence].
Life-Threatening Respiratory Depression
Respiratory depression, including fatal cases, have been reported during initiation and conversion of patients to Methadose, and even when the drug has been used as recommended and not misused or abused [see WARNINGS AND PRECAUTIONS]. Proper dosing and titration are essential and Methadose should only be prescribed by healthcare professionals who are knowledgeable in the use of potent opioids for the management of chronic pain. Monitor for respiratory depression, especially during initiation of Methadose or following a dose increase. The peak respiratory depressant effect of Methadose occurs later, and persists longer than the peak analgesic effect, especially during the initial dosing period.
Life-Threatening QT Prolongation
QT interval prolongation and serious arrhythmia (torsades de pointes) have occurred during treatment with methadone. Most cases involve patients being treated for pain with large, multiple daily doses of methadone, although cases have been reported in patients receiving doses commonly used for maintenance treatment of opioid addiction. Closely monitor patients for changes in cardiac rhythm during initiation and titration of Methadose.
Accidental ingestion of Methadose, especially in children, can result in a fatal overdose of methadone [see WARNINGS AND PRECAUTIONS].
Conditions For Distribution And Use Of Methadone Products For The Treatment Of Opioid Addiction
For detoxification and maintenance of opioid dependence, methadone should be administered in accordance with the treatment standards cited in 42 CFR Section 8, including limitations on unsupervised administration [see INDICATIONS AND USAGE].
Methadone hydrochloride is chemically described as 6-(dimethylamino)-4,4-diphenyl-3-hepatanone hydrochloride. Methadone hydrochloride is a white, crystalline material that is water-soluble. Methadone hydrochloride has a melting point of 235°C, and a pKa of 8.25 in water at 20°C. Its octanol/water partition coefficient at pH 7.4 is 117. A solution (1:100) in water has a pH between 4.5 and 6.5. It has the following structural formula:
C21H27NO•HCl.......................MW = 345.91
Methadose™ Oral Tablets (methadone hydrochloride tablets USP) each contain 5 or 10 mg of methadone hydrochloride, USP and the following inactive ingredients: dibasic calcium phosphate, microcrystalline cellulose, magnesium stearate, colloidal silicon dioxide, pregelatinized starch, and stearic acid.
What are the possible side effects of methadone (Diskets, Dolophine, Methadose)?
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have any of these serious side effects:
- shallow breathing;
- hallucinations or confusion;
- chest pain, dizziness, fainting, fast or pounding heartbeat; or
- trouble breathing, feeling light-headed, or fainting.
Less serious side effects may include:
- feeling anxious, nervous, or restless;
- sleep problems...
Last reviewed on RxList: 7/26/2012
This monograph has been modified to include the generic and brand name in many instances.
Additional Methadose Information
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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