methadone vs safinamide
Side-by-side comparison of methadone and safinamide. Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
major Known Drug Interaction
7.2 Opioid Drugs Because serious, sometimes fatal reactions have been precipitated with concomitant use of opioid drugs (e.g., meperidine and its derivatives, methadone, propoxyphene, or tramadol) and MAOIs, including selective MAO-B inhibitors, concomitant use of these drugs is contraindicated [see Warnings and Precautions (5.2) ] .
Recommendation: Do not use these two drugs together.
Dolophine
Xadago
Methadone Hydrochloride Injection is a strong pain medicine. It is also used to treat opioid dependence temporarily when you cannot take medicine by mouth.
Safinamide (Xadago) is a drug used with levodopa/carbidopa to treat Parkinson's disease. It helps reduce "off" episodes, where symptoms like stiffness and slowness return.
This medicine is used to manage severe, ongoing pain that needs a strong opioid medicine when other pain medicines don't work well enough. It is also used for the short-term treatment of opioid dependence when you cannot take oral medication, such as if you are in the hospital. Injectable methadone is not approved for outpatient treatment of opioid dependence.
Safinamide is used to treat Parkinson's disease. It is for people who take levodopa/carbidopa but still have "off" times. During these times, Parkinson's symptoms like stiffness and slow movement come back.
Methadone works by attaching to opioid receptors in the brain and body. This changes how your body feels pain. It can also help reduce withdrawal symptoms if you are opioid dependent.
Safinamide is a MAO-B inhibitor. It works by blocking an enzyme in the brain that breaks down dopamine. This helps increase the amount of dopamine available, which can improve motor control.
- • Lightheadedness
- • Dizziness
- • Sedation
- • Nausea
- • Vomiting
- • Uncontrolled movements (dyskinesia)
- • Falls
- • Feeling sick to your stomach (nausea)
- • Trouble sleeping (insomnia)
- Addiction to the drug 5,614
- Harmful effects from different substances 5,213
- Misuse of the drug 4,797
- Taking too much of the drug 3,841
- Pain 3,669
- Fall 154
- Seeing or hearing things that are not there 142
- Uncontrolled movements 137
- Trouble walking 93
- Death 90
Methadone Hydrochloride Injection can cause serious and life-threatening risks, including addiction, abuse, and misuse. It can also cause life-threatening breathing problems, especially when you first start taking it or after a dose increase. Using methadone during pregnancy can cause withdrawal symptoms in the newborn. Using methadone with benzodiazepines or other drugs that can cause drowsiness, including alcohol, can cause severe sedation, breathing problems, coma, and death. Methadone can also cause a serious heart problem called QT prolongation.
Safinamide can cause or worsen high blood pressure. It can also cause serotonin syndrome, a dangerous condition, if taken with certain other medicines. Some people taking safinamide have fallen asleep suddenly during normal activities. Safinamide may also cause or worsen uncontrolled movements, hallucinations, and compulsive behaviors. Stopping safinamide suddenly can cause serious withdrawal symptoms.
Using Methadone Hydrochloride Injection during pregnancy can cause withdrawal symptoms in the newborn. Talk to your doctor about the risks and benefits of using this medicine if you are pregnant or plan to become pregnant. It is not known if methadone passes into breast milk, so talk to your doctor before breastfeeding.
Safinamide may harm an unborn baby. Talk to your doctor if you are pregnant or plan to become pregnant. It is not known if safinamide passes into breast milk, so talk to your doctor if you are breastfeeding.
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How to Read This methadone vs safinamide Comparison
methadone is classified in the Opioid Agonist drug class, while safinamide sits within the MAO-B Inhibitor class. Drugs from different classes work through distinct mechanisms, so a head-to-head comparison illustrates trade-offs rather than equivalence. Both drugs are prescription-only, so a licensed provider must authorize use.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, methadone has 23,134 submissions while safinamide has 616. Those figures reflect cumulative reporting volume, not per-patient risk, so older, widely dispensed drugs typically look worse on count alone. These two drugs have a known major interaction flagged in FDA labeling, attributed to taking these together can cause a very serious and potentially fatal reaction in the brain and nervous system.. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot substitute for clinical judgment. Effectiveness, tolerability, drug-drug interactions with your other medications, kidney and liver function, pregnancy status, insurance formulary, and price all feed into a decision that only a licensed prescriber can make responsibly. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This page is for educational purposes only, is not medical advice, and should not be used to self-switch between methadone and safinamide - always consult your physician or pharmacist first.
Important: This comparison is for informational purposes only. Drug effects vary between individuals. Always consult your doctor or pharmacist for personalized medical advice.