Methadone, Injection METH-a-done

What are other names for this medicine?

Type of medicine: narcotic analgesic (painkiller)

Generic and brand names: methadone, injection

What is this medicine used for?

This medicine is a narcotic analgesic. It may be given by injection (shot) or by infusion to relieve pain. It may also be used for anesthesia during surgery or labor.

It is given by injection (shot) to relieve pain and to treat narcotic addiction.

What should my healthcare provider know before I take this medicine?

Before taking this medicine, tell your healthcare provider if you have ever had:

• an allergic reaction to any medicine
• breathing problems or a lung disorder such as asthma or COPD
• stomach or intestinal blockage, severe diarrhea, or constipation
• a head injury or brain tumor
• acute pancreatitis or biliary tract disease
• Addison's disease
• glaucoma
• heart disease or irregular heartbeat
• liver or kidney disease
• long QT syndrome (problems with electrical activity in the heart muscle)
• problems with low levels of potassium or magnesium in your blood
• low blood pressure
• enlarged prostate gland or trouble urinating
• problems with alcohol or drug abuse
• seizures
• sleep apnea
• thyroid problems

Tell your provider if you have taken an MAO inhibitor antidepressant within the past 2 weeks.

Females of childbearing age: Tell your healthcare provider if you are pregnant or plan to become pregnant. It is not known whether this medicine will harm an unborn baby. Do not breast-feed while taking this medicine without your healthcare provider's approval.

How do I use it?

This medicine is given by a healthcare provider.

What should I watch out for?

This medicine may cause serious heart problems. If you have fast or irregular heartbeat, chest pain, trouble breathing, or suddenly faint, contact your healthcare provider right away.

You may need to take this medicine for a long time. If you need to take this medicine for more than a few days, do not stop taking it suddenly. You may have to reduce your dosage gradually to avoid withdrawal symptoms. Follow your healthcare provider's instructions.

This medicine is a controlled substance. It is illegal for you to give it to anyone else.

If you need emergency care, surgery, or dental work, tell the healthcare provider or dentist you are taking this medicine.

This medicine increases the effects of alcohol and other drugs that slow down your nervous system. Do not drink alcohol or take other medicines unless your healthcare provider approves.

This medicine may make you dizzy or drowsy. Do not drive or operate machinery unless you are fully alert.

You may feel dizzy or faint when you get up quickly after sitting or lying down. Getting up slowly may lessen this effect. Also, drinking alcohol may increase this effect.

Contact your healthcare provider if your condition does not improve in a few days or if it gets worse.

This medicine may make you constipated. You may need to take a laxative or stool softener while taking this medicine. Talk with healthcare provider or pharmacist about this.

Adults over the age of 65 may be at greater risk for side effects from this medicine. Talk with your healthcare provider about this.

Important notice: Taking an overdose of this medicine can cause very serious problems. If you think you have taken an overdose, get medical care right away.

What are the possible side effects?

Along with its needed effects, your medicine may cause some unwanted side effects. Some side effects may be very serious. Some side effects may go away as your body adjusts to the medicine. Tell your healthcare provider if you have any side effects that continue or get worse.

Life-threatening (Report these to your healthcare provider right away. If you are unable to reach your healthcare provider right away, get emergency medical care or call 911 for help): Allergic reaction (hives, itching, rash, tightness in your chest, trouble breathing, swelling of your lips, tongue or throat).

Serious (report these to your healthcare provider right away): Seizures, hallucinations (seeing or hearing things that are not there), severe muscle weakness, decreased urination, trembling, fast or irregular heartbeat, sudden fainting, slow breathing or shortness of breath, confusion, pinpoint pupils of the eyes, blurred vision.

Other: Dizziness; drowsiness; lightheadedness; nausea; vomiting; constipation; itching; headache; dry mouth; sweating; loss of appetite; change in sexual desire or ability; pain, redness, or swelling at the injection site.

What products might interact with this medicine?

When you take this medicine with other medicines, it can change the way this or any of the other medicines work. Nonprescription medicines, vitamins, natural remedies, and certain foods may also interact. Using these products together might cause harmful side effects. Talk to your healthcare provider if you are taking:

• antianxiety medicines such as alprazolam (Xanax), chlordiazepoxide (Librium), clonazepam (Klonopin), clorazepate (Tranxene), diazepam (Valium), flurazepam, lorazepam (Ativan), oxazepam, temazepam (Restoril), and triazolam (Halcion)
• antibiotics such as ciprofloxacin (Cipro), clarithromycin (Biaxin), doxycycline (Adoxa, Doryx, Monodox, Vibramycin), erythromycin (Ery-Tabs, E.E.S.), and rifampin (Rifadin, Rimactane)
• antidepressants such as amitriptyline, citalopram (Celexa), desipramine (Norpramin), doxepin, escitalopram (Lexapro), nefazodone, fluoxetine (Prozac), fluvoxamine (Luvox), imipramine (Tofranil), nortriptyline (Pamelor), paroxetine (Paxil), sertraline (Zoloft), and venlafaxine (Effexor),
• antiseizure medicines such as carbamazepine (Tegretol), felbamate (Felbatol), gabapentin (Neurontin), lamotrigine (Lamictal), levetiracetam (Keppra), oxcarbazepine (Trileptal), phenytoin (Dilantin), primidone (Mysoline), tiagabine (Gabitril), topiramate (Topamax), and valproic acid (Depacon, Depakene, Depakote)
• antifungals such as clotrimazole, fluconazole (Diflucan), itraconazole (Sporanox), and ketoconazole (Nizoral)
• antihistamines such as chlorpheniramine (Chlor-Trimeton), diphenhydramine (Benadryl), and hydroxyzine (Vistaril)
• anti-HIV medicines such as efavirenz (Sustiva), indinavir (Crixivan), nelfinavir (Viracept), nevirapine (Viramune), ritonavir (Norvir), saquinavir (Invirase), stavudine (Zerit), and zidovudine (Retrovir)
• antinausea medicines such as prochlorperazine, and promethazine (Phenergan)
• antipsychotic medicines such as chlorpromazine, clozapine (Clozaril), fluphenazine, haloperidol (Haldol), olanzapine (Zyprexa), perphenazine, risperidone (Risperdal), thioridazine, and trifluoperazine
• barbiturates such as butabarbital (Butisol), pentobarbital (Nembutal), and phenobarbital
• calcium channel blockers such as amlodipine (Norvasc), diltiazem (Cardizem, Dilacor, Tiazac), felodipine, isradipine (DynaCirc), nicardipine (Cardene), nifedipine (Procardia, Adalat), and verapamil (Calan, Isoptin, Verelan)
• heart medicines such as amiodarone (Cordarone, Pacerone), disopyramide (Norpace), flecainide (Tambocor), quinidine, procainamide, propafenone (Rythmol), and sotalol (Betapace)
• diuretics such as bumetanide, furosemide (Lasix), and torsemide (Demadex)
• laxatives (taken on a regular basis)
• corticosteroids such as cortisone and fludrocortisone (Florinef)
• linezolid (Zyvox)
• MAO inhibitor antidepressants such as isocarboxazid (Marplan), phenelzine (Nardil), selegiline (Eldepryl, Emsam), and tranylcypromine (Parnate) (Do not take this medicine and an MAO inhibitor within 14 days of each other.)
• medicines to treat Parkinson's disease such as cabergoline, entacapone (Comtan), pramipexole (Mirapex), ropinirole (Requip), and tolcapone (Tasmar)
• muscle relaxants such as baclofen (Lioresal), carisoprodol (Soma), cyclobenzaprine (Flexeril), dantrolene (Dantrium), methocarbamol (Robaxin), and tizanidine (Zanaflex)
• naltrexone (ReVia)
• natural remedies such as ginseng, gotu kola, kava, St. John's wort, and valerian
• other narcotic analgesics such as buprenorphine (Buprenex, Subutex), butorphanol (Stadol), codeine, fentanyl (Duragesic patches), hydrocodone (Vicodin, Lortab), hydromorphone (Dilaudid), meperidine (Demerol), methadone (Dolophine), morphine (MS Contin), nalbuphine, oxycodone (OxyContin), oxycodone/acetaminophen (Percocet, Tylox), and pentazocine (Talwin)
• sleeping pills such as chloral hydrate, zaleplon (Sonata), and zolpidem (Ambien)
• tramadol (Ultram)

Do not drink alcohol while you are taking this medicine.

Do not eat grapefruit or drink grapefruit juice while taking this medicine. Grapefruit affects the way this medicine works and may increase the risk of side effects.

If you are not sure if your medicines might interact, ask your pharmacist or healthcare provider. Keep a list of all your medicines with you. List all the prescription medicines, nonprescription medicines, supplements, natural remedies, and vitamins that you take. Be sure that you tell all healthcare providers who treat you about all the products you are taking.

This advisory includes selected information only and may not include all side effects of this medicine or interactions with other medicines. Ask your healthcare provider or pharmacist for more information or if you have any questions.

Ask your pharmacist for the best way to dispose of outdated medicine or medicine you have not used. Do not throw medicine in the trash.

Keep all medicines out of the reach of children.

Do not share medicines with other people.