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Methadone is an opioid analgesic indicated for management of severe pain that is not responsive to alternative treatments, buy methadone 20mg.

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Methadone is an opioid analgesic indicated for management of severe pain that is not responsive to alternative treatments, buy methadone 20mg. Also used to aid in detoxification and maintenance treatment of opioid addiction.

Methadone is a potent synthetic analgesic that works as a full µ-opioid receptor (MOR) agonist and N-methyl-d-aspartate (NMDA) receptor antagonist. As a full MOR agonist, methadone mimics the natural effects of the body’s opioids, endorphins, and enkephalins through the release of neurotransmitters involved in pain transmission. It also has a number of unique characteristics that have led to its increased use in the last two decades; in particular, methadone has a lower risk of neuropsychiatric toxicity compared to other opioids (due to a lack of active metabolites), minimal accumulation in renal failure, good bioavailability, low cost, and a long duration of action. – buy methadone 20mg

Due to its unique mechanism of action, methadone is particularly useful for the management of hard to treat pain syndromes such as neuropathic pain and cancer pain requiring higher and more frequent doses of shorter-acting opioids. Compared with morphine, the gold standard reference opioid, methadone also acts as an agonist of κ- and σ-opioid receptors, as an antagonist of the N-methyl-D-aspartate (NMDA) receptor, and as an inhibitor of serotonin and norepinephrine uptake. Specifically by inhibiting the NMDA receptor, methadone dampens a major excitatory pain pathway within the central nervous system. Compared to other opioids, methadone’s effects on NMDA inhibition may explain it’s improved analgesic efficacy and reduced opioid tolerance.

Methadone shares similar effects and risks of other opioids such as morphine, hydromorphone, oxycodone, and fentanyl. However, it also has a unique pharmacokinetic profile. Compared with short-acting and even extended-release formulations of morphine, methadone displays a comparatively longer duration of action and half-life. These effects make methadone a good option for the treatment of severe pain and addiction as fewer doses are needed to maintain analgesia and prevent opioid withdrawal symptoms. However, methadone also has an unpredictable half-life with interindividual variability, which leads to an unpredictable risk of respiratory depression and overdose when initiating or titrating therapy. – buy methadone 20mg

Overall, methadone’s pharmacological actions result in analgesia, suppression of opioid withdrawal symptoms, sedation, miosis, sweating, hypotension, bradycardia, nausea and vomiting (via binding within the chemoreceptor trigger zone), and constipation. At higher doses, methadone use can result in respiratory depression, overdose, and death. – buy methadone 20mg

Treatment of opioid addiction with methadone, buprenorphine, or slow-release oral morphine (SROM) is termed Opioid Agonist Treatment (OAT) or Opioid Substitution Therapy (OST). The intention of substitution of illicit opioids with the long-acting opioids used in OAT is to prevent withdrawal symptoms for 24-36 hours following dosing to ultimately reduce cravings and drug-seeking behaviours. Use of OAT is also intended to lead to social stabilization by reducing crime rates, incarceration, use of illicit opioids such as heroin or fentanyl, and ultimately marginalization. Illegally purchased opioids present many other harms in addition to overdose as they can be injected and may be laced with other substances that increase the risk of harm or overdose. Provision of OAT is often combined with education about harm reduction including use of clean needles and injection supplies in an effort to reduce the risks associated with injection drug use such as contraction of HIV and Hepatitis C and other complications including skin infections, abscesses, or endocarditis.

TypeSmall MoleculeGroupsApprovedStructure – buy methadone 20mg

buy methadone 20mg
Weight
Average: 309.4452
Monoisotopic: 309.209264491
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C21H27NO

Synonyms

  • Metadona
  • Methadone
  • Methadonum

Pharmacodynamics – buy methadone 20mg

Overall, methadone’s pharmacological actions result in analgesia, suppression of opioid withdrawal symptoms, sedation, miosis (through binding to receptors in the pupillary muscles), sweating, hypotension, bradycardia, nausea and vomiting (via binding within the chemoreceptor trigger zone), and constipation. Like many basic drugs, methadone also enters mast cells and releases histamine by a non-immunological mechanism leading to flushing, pruritus, and urticaria, which can commonly be misattributed to an allergic reaction.

Compared to other opioids, methadone has fewer active metabolites and therefore a lower risk of neuropsychiatric toxicity. This means that higher doses needed to manage severe pain or addiction are less likely to result in delirium, hyperalgesia, or seizures.

Similar to morphine, both methadone isomers are 5-HT(3) receptor antagonists, although l-methadone produces greater inhibition than d-methadone.

Methadone’s effects are reversible by naloxone with a pA2 value similar to its antagonism of morphine.

Dependence and Tolerance – buy methadone 20mg

As with other opioids, tolerance and physical dependence may develop upon repeated administration of methadone and there is a potential for development of psychological dependence. Physical dependence and tolerance reflect the neuroadaptation of the opioid receptors to chronic exposure to an opioid and are separate and distinct from abuse and addiction. Tolerance, as well as physical dependence, may develop upon repeated administration of opioids, and are not by themselves evidence of an addictive disorder or abuse.

Patients on prolonged therapy should be tapered gradually from the drug if it is no longer required for pain control. Withdrawal symptoms may occur following abrupt discontinuation of therapy or upon administration of an opioid antagonist. Some of the symptoms that may be associated with abrupt withdrawal of an opioid analgesic include body aches, diarrhea, gooseflesh, loss of appetite, nausea, nervousness or restlessness, anxiety, runny nose, sneezing, tremors or shivering, stomach cramps, tachycardia, trouble with sleeping, unusual increase in sweating, palpitations, unexplained fever, weakness and yawning.

Cardiac Conduction Effects – buy methadone 20mg

Laboratory studies, both in vivo and in 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).

Methadone should be administered with particular caution to patients already at risk for development of prolonged QT interval (e.g., cardiac hypertrophy, concomitant diuretic use, hypokalemia, hypomagnesemia). Careful monitoring is recommended when using methadone in patients with a history of cardiac conduction disease, those taking medications affecting cardiac conduction, and in other cases where history or physical exam suggest an increased risk of dysrhythmia.

Respiratory Depression and Overdose – buy methadone 20mg

Serious, life-threatening, or fatal respiratory depression may occur with use of methadone. Patients should be monitored for respiratory depression, especially during initiation of methadone or following a dose increase.- buy methadone 20mg

Respiratory depression is of particular concern in elderly or debilitated patients as well as in those suffering from conditions accompanied by hypoxia or hypercapnia when even moderate therapeutic doses may dangerously decrease pulmonary ventilation. Methadone should be administered with extreme caution to patients with conditions accompanied by hypoxia, hypercapnia, or decreased respiratory reserve such as: asthma, chronic obstructive pulmonary disease or cor pulmonale, severe obesity, sleep apnea syndrome, myxedema, kyphoscoliosis, and CNS depression or coma.

In these patients, even usual therapeutic doses of methadone may decrease respiratory drive while simultaneously increasing airway resistance to the point of apnea. Alternative, non-opioid analgesics should be considered, and methadone should be employed only under careful medical supervision at the lowest effective dose.

Infants exposed in-utero or through breast milk are at risk of life-threatening respiratory depression upon delivery or when nursed. buy methadone 20mg

Methadone’s peak respiratory depressant effects typically occur later, and persist longer than its peak analgesic effects, in the short-term use setting. These characteristics can contribute to cases of iatrogenic overdose, particularly during treatment initiation and dose titration.

Head Injury and Increased Intracranial Pressure

The respiratory depressant effects of opioids and their capacity to elevate cerebrospinal fluid pressure may be markedly exaggerated in the presence of head injury, other intracranial lesions or a pre-existing increase in intracranial pressure. Furthermore, opioids produce effects which may obscure the clinical course of patients with head injuries. In such patients, methadone must be used with caution, and only if it is deemed essential. buy methadone 20mg

Incomplete Cross-tolerance between Methadone and other Opioids

Patients tolerant to other opioids may be incompletely tolerant to methadone. Incomplete cross-tolerance is of particular concern for patients tolerant to other µ-opioid agonists who are being converted to methadone, thus making the determination of dosing during opioid conversion complex. Deaths have been reported during conversion from chronic, high-dose treatment with other opioid agonists. A high degree of “opioid tolerance” does not eliminate the possibility of methadone overdose, iatrogenic or otherwise.

Crosstolerance between morphine and methadone has been demonstrated, as steady-state plasma methadone concentrations required for effectiveness (C50%) were higher in abstinent rats previously dosed with morphine, as compared to controls. buy methadone 20mg

Misuse, Abuse, and Diversion of Opioids

Methadone is a mu-agonist opioid with an abuse liability similar to morphine. Methadone, like morphine and other opioids used for analgesia, has the potential for being abused and is subject to criminal diversion.

Methadone can be abused in a manner similar to other opioid agonists, legal or illicit. This should be considered when dispensing Methadone in situations where the clinician is concerned about an increased risk of misuse, abuse, or diversion.

Hypotensive Effect

The administration of methadone may result in severe hypotension in patients whose ability to maintain normal blood pressure is compromised (e.g., severe volume depletion). – buy methadone 20mg

Gastrointestinal Effects

Methadone and other morphine-like opioids have been shown to decrease bowel motility and cause constipation. This primarily occurs through agonism of opioid receptors in the gut wall. Methadone may obscure the diagnosis or clinical course of patients with acute abdominal conditions.

Sexual Function/Reproduction

Reproductive function in human males may be decreased by methadone treatment. Reductions in ejaculate volume and seminal vesicle and prostate secretions have been reported in methadone-treated individuals. In addition, reductions in serum testosterone levels and sperm motility, and abnormalities in sperm morphology have been reported. Long-term use of opioids may be associated with decreased sex hormone levels and symptoms such as low libido, erectile dysfunction, or infertility.

 

IMPORTANT WARNING:

Methadone may be habit forming. Take methadone exactly as directed. Do not take a larger dose, take it more often, or take it for a longer period of time or in a different way than prescribed by your doctor. While taking methadone, discuss with your healthcare provider your pain treatment goals, length of treatment, and other ways to manage your pain. Tell your doctor if you or anyone in your family drinks or has ever drunk large amounts of alcohol, uses or has ever used street drugs, or has overused prescription medications, or has had an overdose, or if you have or have ever had depression or another mental illness. There is a greater risk that you will overuse methadone if you have or have ever had any of these conditions. Talk to your healthcare provider immediately and ask for guidance if you think that you have an opioid addiction or call the U.S. Substance Abuse and Mental Health Services Administration (SAMHSA) National Helpline at 1-800-662-HELP.

Methadone may cause serious or life-threatening breathing problems, especially during the first 24 to 72 hours of your treatment and any time your dose is increased. Your doctor will monitor you carefully during your treatment. Tell your doctor if you have or have ever had slowed breathing or asthma. Your doctor will probably tell you not to take methadone. Also tell your doctor if you have or have ever had lung disease such as chronic obstructive pulmonary disease (COPD; a group of lung diseases that includes chronic bronchitis and emphysema), a head injury, a brain tumor, or any condition that increases the amount of pressure in your brain. The risk that you will develop breathing problems may be higher if you are an older adult or are weak or malnourished due to disease. If you experience any of the following symptoms, call your doctor immediately or get emergency medical treatment: slowed breathing, long pauses between breaths, or shortness of breath.

Taking certain other medications during your treatment with methadone may increase the risk that you will experience serious, life-threatening side effects such as breathing problems, sedation, or coma. Tell your doctor if you are taking or plan to take any of the following medications: antipsychotics such as aripiprazole (Abilify), asenapine (Saphris), cariprazine (Vraylar), chlorpromazine, clozapine (Versacloz), fluphenazine, haloperidol (Haldol), iloperidone (Fanapt), loxapine, lurasidone (Latuda), molindone, olanzapine (Zyprexa), paliperidone (Invega), perphenazine, pimavanserin (Nuplazid), quetiapine (Seroquel), risperidone (Risperdal), thioridazine, thiothixene, trifluoperazine, and ziprasidone (Geodon); benzodiazepines such as alprazolam (Xanax), chlordiazepoxide (Librium), clonazepam (Klonopin), clorazepate (Gen-Xene, Tranxene), diazepam (Diastat, Valium), estazolam, flurazepam, lorazepam (Ativan), oxazepam, temazepam (Restoril), and triazolam (Halcion); opiate (narcotic) medications for pain and cough; medications for nausea or mental illness; muscle relaxants; sedatives; sleeping pills; or tranquilizers. Your doctor may need to change the doses of your medications and will monitor you carefully. If you take methadone with any of these medications and you develop any of the following symptoms, call your doctor immediately or seek emergency medical care: unusual dizziness, lightheadedness, extreme sleepiness, slowed or difficult breathing, or unresponsiveness. Be sure that your caregiver or family members know which symptoms may be serious so they can call the doctor or emergency medical care if you are unable to seek treatment on your own.

Drinking alcohol, taking prescription or nonprescription medications that contain alcohol, or using street drugs during your treatment with methadone increases the risk that you will experience serious, life-threatening side effects. Do not drink alcohol, take prescription or nonprescription medications that contain alcohol, or use street drugs during your treatment.

Do not allow anyone else to take your medication. Methadone may harm or cause death to other people who take your medication, especially children. Store methadone in a safe place so that no one else can take it accidentally or on purpose. Be especially careful to keep methadone out of the reach of children. Keep track of how many tablets or how much liquid is left so you will know if any medication is missing. Dispose of any unwanted methadone tablets or oral solution properly according to instructions. (See STORAGE and DISPOSAL.)

Methadone may cause a prolonged QT interval (a rare heart problem that may cause irregular heartbeat, fainting, or sudden death). Tell your doctor if you or anyone in your family has or has ever had long QT syndrome; or if you have or ever had a slow or irregular heartbeat; low blood levels of potassium or magnesium, or heart disease. Tell your doctor and pharmacist if you are taking or plan to take any of the following medications: antidepressants such as amitriptyline, amoxapine, clomipramine (Anafranil), desipramine (Norpramin), doxepin (Silenor), imipramine (Tofranil), nortriptyline (Pamelor), protriptyline (Vivactil), and trimipramine (Surmontil); certain antifungals such as fluconazole (Diflucan), itraconazole (Onmel, Sporanox), ketoconazole, and voriconazole (Vfend); diuretics (‘water pills’); erythromycin (Eryc, Erythrocin, others); fludrocortisone; certain laxatives; medications for irregular heartbeat such as amiodarone (Nexterone, Pacerone), disopyramide (Norpace), dofetilide (Tikosyn), flecainide, ibutilide (Corvert), procainamide, and quinidine (in Nuedexta); nicardipine (Cardene); and risperidone (Risperdal); and sertraline (Zoloft). If you experience any of the following symptoms, call your doctor immediately: pounding heartbeat, dizziness, lightheadedness, or fainting.

Tell your doctor if you are pregnant or plan to become pregnant. If you take methadone regularly during your pregnancy, your baby may experience life-threatening withdrawal symptoms after birth. Tell your baby’s doctor right away if your baby experiences any of the following symptoms: irritability, hyperactivity, abnormal sleep, high-pitched cry, uncontrollable shaking of a part of the body, vomiting, diarrhea, or failure to gain weight. buy methadone 20mg

Talk to your doctor about the risks of taking methadone for your condition.-buy methadone 20mg

Your doctor or pharmacist will give you the manufacturer’s patient information sheet (Medication Guide) when you begin treatment with methadone and each time you fill your prescription if a Medication Guide is available for the methadone product you are taking. Read the information carefully and ask your doctor or pharmacist if you have any questions. You can also visit the Food and Drug Administration (FDA) website (http://www.fda.gov/Drugs/DrugSafety/ucm085729.htm) or the manufacturer’s website to obtain the Medication Guide.

Use of methadone to treat opiate addiction:

If you have been addicted to an opiate (narcotic drug such as heroin), and you are taking methadone to help you stop taking or continue not taking the drug, you must enroll in a treatment program. The treatment program must be approved by the state and federal governments and must treat patients according to specific federal laws.

You may have to take your medication at the treatment program facility under the supervision of the program staff. Ask your doctor or the treatment program staff if you have any questions about enrolling in the program or taking or getting your medication.

FAQ

Why is this medication prescribed?

Methadone is used to relieve severe pain in people who are expected to need pain medication around the clock for a long time and who cannot be treated with other medications. It also is used to prevent withdrawal symptoms in patients who were addicted to opiate drugs and are enrolled in treatment programs in order to stop taking or continue not taking the drugs.

Methadone is in a class of medications called opiate (narcotic) analgesics. Methadone works to treat pain by changing the way the brain and nervous system respond to pain. It works to treat people who were addicted to opiate drugs by producing similar effects and preventing withdrawal symptoms in people who have stopped using these drugs.

How should this medicine be used?

Methadone comes as a tablet, a dispersible (can be dissolved in liquid) tablet, a solution (liquid), and a concentrated solution to take by mouth. When methadone is used to relieve pain, it may be taken every 8 to 12 hours. If you take methadone as part of a treatment program, your doctor will prescribe the dosing schedule that is best for you. Follow the directions on your prescription label carefully and ask your doctor or pharmacist to explain any part you do not understand. Take methadone exactly as directed.

If you are using the dispersible tablets, do not chew or swallow before mixing the tablet in a liquid. If your doctor has told you to take only part of a tablet, break the tablet carefully along the lines that have been scored into it. Place the tablet or piece of the tablet in at least 120 mL (4 ounces) of water, orange juice, Tang®, citrus flavors of Kool-Aid®, or a citrus fruit drink to dissolve. Drink the entire mixture right away. If some tablet residue remains in the cup after you drink the mixture, add a small amount of liquid to the cup and drink it all.

Your doctor may change your dose of methadone during your treatment. Your doctor may decrease your dose or tell you to take methadone less often as your treatment continues. If you experience pain during your treatment, your doctor may increase your dose or may prescribe an additional medication to control your pain. Talk to your doctor about how you are feeling during your treatment with methadone. Do not take extra doses of methadone or take doses of methadone earlier than they are scheduled even if you experience pain.

Do not stop taking methadone without talking to your doctor. Your doctor will probably want to decrease your dose gradually. If you suddenly stop taking methadone, you may experience withdrawal symptoms such as restlessness, teary eyes, runny nose, yawning, sweating, chills, muscle pain, widened pupils (black circles in the middle of the eyes), irritability, anxiety, backache, joint pain, weakness, stomach cramps, difficulty falling asleep or staying asleep, nausea, decreased appetite, vomiting, or diarrhea.

Other uses for this medicine – buy methadone 20mg

This medication may be prescribed for other uses; ask your doctor or pharmacist for more information.

What special precautions should I follow?

Before taking methadone,

  • tell your doctor and pharmacist if you are allergic to methadone, any other medications, or any of the ingredients in the methadone product you plan to take. Ask your doctor or pharmacist or check the Medication Guide for a list of the ingredients.
  • tell your doctor and pharmacist what prescription and nonprescription medications, vitamins, and nutritional supplements you are taking or plan to take. Be sure to mention the medications listed in the IMPORTANT WARNING section and any of the following: antihistamines; buprenorphine (Suboxone, in Zubsolv); butorphanol; carbamazepine (Cabatrol, Equetro, Tegretol, others); cyclobenzaprine (Amrix); dextromethorphan (found in many cough medications; in Nuedexta); medications for glaucoma, irritable bowel disease, Parkinson’s disease, ulcers, and urinary problems; certain medications for HIV including abacavir (Ziagen, in Trizivir), darunavir (Prezista), didanosine (Videx), efavirenz (Sustiva, in Atripla), lopinavir (in Kaletra), nelfinavir (Viracept), nevirapine (Viramune), ritonavir (Norvir, in Kaletra), saquinavir (Invirase), stavudine (Zerit), tipranavir (Aptivus), and zidovudine (Retrovir, in Combivir); lithium (Lithobid); medications for migraine headaches such as almotriptan (Axert), eletriptan (Relpax), frovatriptan (Frova), naratriptan (Amerge), rizatriptan (Maxalt), sumatriptan (Alsuma, Imitrex, in Treximet), and zolmitriptan (Zomig); mirtazapine (Remeron); nalbuphine; naloxone (Evzio, Narcan, in Zubsolv); naltrexone (ReVia, Vivitrol, in Embeda); pentazocine (Talwin); phenobarbital; phenytoin (Dilantin, Phenytek); rifampin (Rifadin, Rimactane, in Rifamate, in Rifater); 5HT3 serotonin blockers such as alosetron (Lotronex), dolasetron (Anzemet), granisetron (Kytril), ondansetron (Zofran, Zuplenz), or palonosetron (Aloxi); selective serotonin-reuptake inhibitors such as citalopram (Celexa), escitalopram (Lexapro), fluoxetine (Prozac, Sarafem, in Symbyax), fluvoxamine (Luvox), and paroxetine (Brisdelle, Prozac, Pexeva); serotonin and norepinephrine reuptake inhibitors such as desvenlafaxine (Khedezla, Pristiq), duloxetine (Cymbalta), milnacipran (Savella); and venlafaxine (Effexor); tramadol (Conzip, Ultram, in Ultracet); and trazodone (Oleptro). Also tell your doctor or pharmacist if you are taking or receiving the following medications or have stopped taking them in the past 14 days: monoamine oxidase (MAO) inhibitors including isocarboxazid (Marplan), linezolid (Zyvox), methylene blue, phenelzine (Nardil), selegiline (Eldepryl, Emsam, Zelpar), and tranylcypromine (Parnate). Many other medications may also interact with methadone, so be sure to tell your doctor about all the medications you are taking, even those that do not appear on this list. Your doctor may need to change the doses of your medications or monitor you carefully for side effects.
  • tell your doctor what herbal products you are taking, especially St. John’s wort and tryptophan.
  • tell your doctor if you have any of the conditions mentioned in the IMPORTANT WARNING section or have or have ever had a blockage in your intestine or paralytic ileus (condition in which digested food does not move through the intestines). Your doctor may tell you that you should not take methadone.
  • tell your doctor if you have or have ever had difficulty urinating; an enlarged prostate (a male reproductive gland); Addison’s disease (a condition in which the adrenal gland does not make enough of certain natural substances); seizures; or thyroid, pancreas, gallbladder, liver, or kidney disease.
  • tell your doctor if you are breastfeeding. If you breastfeed during your treatment with methadone, your baby may receive some methadone in breastmilk. Watch your baby closely for any changes in behavior or breathing, especially when you start taking methadone. If your baby develops any of these symptoms, call your baby’s doctor immediately or get emergency medical help: unusual sleepiness, difficulty breastfeeding, difficulty breathing, or limpness. Talk to your baby’s doctor when you are ready to wean your baby. You will need to wean your baby gradually so that your baby will not develop withdrawal symptoms when he or she stops receiving methadone in breastmilk.
  • you should know that this medication may decrease fertility in men and women. Talk to your doctor about the risks of taking methadone.
  • if you are having surgery, including dental surgery, tell the doctor or dentist that you are taking methadone.
  • you should know that this medication may make you drowsy. Do not drive a car or operate machinery until you know how this medication affects you.
  • you should know that methadone may cause dizziness when you get up too quickly from a lying position. This is more common when you first start taking methadone. To avoid this problem, get out of bed slowly, resting your feet on the floor for a few minutes before standing up.
  • you should know that methadone may cause constipation. Talk to your doctor about changing your diet or using other medications to prevent or treat constipation while you are taking methadone.

What special dietary instructions should I follow?

Talk to your doctor about eating grapefruit and drinking grapefruit juice while taking this medicine.

What should I do if I forget a dose?

If your doctor has told you to take methadone for pain, take the missed dose as soon as you remember it and then continue your regular dosing schedule. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. Do not take a double dose to make up for a missed one.

If you are taking methadone to treat opioid addiction, skip the missed dose and take the next dose the next day as scheduled. Do not take a double dose to make up for a missed one.

What side effects can this medication cause? – buy methadone 20mg

Methadone may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:

  • headache
  • weight gain
  • stomach pain
  • dry mouth
  • sore tongue
  • flushing
  • difficulty urinating
  • mood changes
  • vision problems
  • difficulty falling asleep or staying asleep

Some side effects can be serious. If you experience any of the following symptoms or those mentioned in the IMPORTANT WARNING section, call your doctor immediately or get emergency medical help:

  • seizures
  • itching
  • hives
  • rash
  • swelling of the eyes, face, mouth, tongue, or throat
  • hoarseness
  • difficulty breathing or swallowing
  • extreme drowsiness
  • agitation, hallucinations (seeing things or hearing voices that do not exist), fever, sweating, confusion, fast heartbeat, shivering, severe muscle stiffness or twitching, loss of coordination, nausea, vomiting, or diarrhea
  • nausea, vomiting, loss of appetite, weakness, or dizziness
  • inability to get or keep an erection
  • irregular menstruation
  • decreased sexual desire

Methadone may cause other side effects. Call your doctor if you have any unusual problems while you are taking this medication.

What should I know about storage and disposal of this medication?

Keep this medication in the container it came in, tightly closed, and out of reach of children. Store it at room temperature and away from excess heat and moisture (not in the bathroom). You must immediately dispose of any methadone that is outdated or no longer needed through a medicine take-back program.

If you do not have a take-back program nearby or one that you can access promptly, flush any methadone tablets or solution that are outdated or no longer needed down the toilet. Talk to your pharmacist about the proper disposal of your medication.

It is important to keep all medication out of sight and reach of children as many containers (such as weekly pill minders and those for eye drops, creams, patches, and inhalers) are not child-resistant and young children can open them easily.

To protect young children from poisoning, always lock safety caps and immediately place the medication in a safe location – one that is up and away and out of their sight and reach. http://www.upandaway.org

Table

Drug interactions with methadone

DrugInteraction typeClinical effectPractitioner considerations
Naloxone, naltrexone, pentazocine, nalbuphine-mixed opiate antagonists/partial agonistsPharmacodynamic—receptor blockadePrecipitate abstinence syndromeMust avoid in patients on methadone therapy; may use naloxone to treat overdose
Rifampin, carbamazepine, phenytoin, nevirapinePharmacokinetic—enhance eliminationReduce blood concentrations and effectiveness and may produce abstinence syndromeIncrease dose of methadone
Benzodiazepines, ethanolPharmacodynamic—additive/synergistic CNS depressionIncreased sedation and risk of respiratory failureAvoid in patients on methadone therapy
Ritonavir, fluvoxaminePharmacokinetic—decreased metabolismProduce methadone toxicityReduce dose of methadone
Zidovudine, desipraminePharmacokinetic—reduced clearanceIncreased risk of zidovudine and desipramine toxicityReduce zidovudine dosage and monitor for toxicity; monitor desipramine serum concentrations
ThyroxineLaboratory increased concentrations of thyroxine binding globulinAltered thyroid function tests (increased T3, T4, FTI, and TBG).Monitor for euthyroid state with free T3 and T4 and TSH levels
Opiate analgesicsPharmacodynamic cross-tolerance between opioid agentsPartial tolerance to analgesic effect of opioidsTitrate and adjust dosage interval to attain analgesia, avoid mixed agonist-antagonists (eg. pentazocine) or substitute with non-narcotic analgesics (eg. NSAIDs)
T3 = triiodothyronine, T4 = thyroxine, FTI = free thyroxine index, TBG = thyroxine binding globin; TSH = thyroid-stimulating hormone; NSAIDs = nonsteroidal anti-inflammatory drugs

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