mirtazapine vs morphine
Side-by-side comparison of mirtazapine and morphine. Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
minor Known Drug Interaction
Examples: Selective serotonin reuptake inhibitors (SSRIs), serotonin and norepinephrine reuptake inhibitors (SNRIs), tricyclic antidepressants (TCAs), triptans, 5-HT3 receptor antagonists, drugs that effect the serotonin neurotransmitter system (e.g., mirtazapine, trazodone, tramadol), certain muscle relaxants (i.e., cyclobenzaprine, metaxalone), monoamine oxidase (MAO) inhibitors (those intended to treat psychiatric disorders and also others, such as linezolid and intravenous methylene blue).
Recommendation: Your doctor may need to monitor you more often, especially when you first start taking these medicines together.
Remeron
MS Contin, Kadian
Mirtazapine is a medicine used to treat depression in adults. It can help improve your mood and energy levels.
Morphine is a strong pain medicine. It is used to treat severe pain that needs an opioid medicine when other treatments don't work well enough.
Mirtazapine is used to treat major depressive disorder (MDD) in adults. This condition can cause you to feel sad, lose interest in activities, and have trouble with sleeping or eating. Mirtazapine can help improve these symptoms.
Morphine is used to manage severe pain in adults and children who weigh at least 110 pounds. It is for pain that requires an opioid medicine. It is used when other pain treatments are not strong enough or cannot be tolerated.
Mirtazapine works by affecting certain chemicals in the brain called neurotransmitters. It helps to increase the levels of norepinephrine and serotonin. These chemicals can help improve mood and reduce symptoms of depression.
Morphine works by attaching to receptors in the brain and spinal cord. These receptors are involved in sending pain signals. By binding to these receptors, morphine blocks pain signals and reduces pain.
- • Feeling sleepy
- • Increased appetite
- • Weight gain
- • Dizziness
- • Constipation
- • Nausea
- • Feeling sleepy
- • Lightheadedness
- • Dizziness
- Feeling sick to your stomach 4,838
- Feeling tired 4,714
- Accidentally falling down 4,026
- Loose or watery stools 3,961
- Harm from different substances 3,705
- Pain 5,857
- Feeling sick to your stomach 5,534
- Throwing up 4,333
- Death 4,305
- Feeling tired 4,129
Antidepressants may increase the risk of suicidal thoughts and behaviors in young adults. Your doctor should closely watch you for worsening depression or suicidal thoughts. Mirtazapine is not approved for use in children.
Morphine can cause addiction, abuse, and misuse, which can lead to overdose and death. It can also cause life-threatening breathing problems, especially when you start taking it or after a dose increase. Accidental ingestion, especially by children, can cause a fatal overdose. Taking morphine with benzodiazepines or other CNS depressants (including alcohol) can cause severe sedation, breathing problems, coma, and death. If you use morphine for a long time during pregnancy, your baby could have withdrawal symptoms after birth.
Tell your doctor if you are pregnant or plan to become pregnant. Mirtazapine should be used during pregnancy only if clearly needed. Talk to your doctor if you are breastfeeding.
Morphine may harm your unborn baby. Using morphine for a long time during pregnancy can cause withdrawal symptoms in the newborn. Tell your doctor if you are pregnant or plan to become pregnant.
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How to Read This mirtazapine vs morphine Comparison
mirtazapine is classified in the Noradrenergic and Specific Serotonergic Antidepressant (NaSSA) drug class, while morphine sits within the Opioid Analgesic 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, mirtazapine has 21,244 submissions while morphine has 24,158. 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 minor interaction flagged in FDA labeling, attributed to these medications both change how serotonin works in your nervous system. using them at the same time can cause too much serotonin to build up.. 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 mirtazapine and morphine - 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.