Combining Morphine and Tizanidine is a major interaction and should generally be avoided without close medical supervision.
Patients may experience profound sedation, respiratory depression, hypotension, dizziness, confusion, and impaired psychomotor function. This can lead to an increased risk of falls, accidental injury, and life-threatening respiratory compromise. The risk is heightened in elderly patients or those with pre-existing respiratory conditions.
Mechanism: Both morphine, an opioid analgesic, and tizanidine, an alpha-2 adrenergic agonist muscle relaxant, are central nervous system (CNS) depressants. Their co-administration leads to an additive depressant effect on the CNS, enhancing sedation and respiratory depression. Tizanidine also has hypotensive effects that can be additive with opioids.
Morphine vs. Tizanidine
Compare Morphine and Tizanidine: mechanism of action, indications, side effects, cost, and which may be right for you.
Drug A
Morphine
Opium Tincture Deodorized
Opioid Analgesics
RxDrug B
Tizanidine
Tizanidine
Skeletal Muscle Relaxants
RxQuick Comparison
| Category | Morphine | Tizanidine |
|---|---|---|
| Drug Class | Opioid Analgesics | Skeletal Muscle Relaxants |
| Rx Status | Rx | Rx |
| Generic Available | No | No |
| Typical Cost | $200–$600/month | $4–$25/month |
Morphine Overview
MORPHINE (brand name: Opium Tincture Deodorized) is a Opioid Analgesics. INDICATIONS AND USAGE Opium tincture is useful for the treatment of diarrhea.
Full Morphine guide →Tizanidine Overview
Tizanidine is a medication used to relax muscles and reduce muscle stiffness or spasms (spasticity). It works by acting on the nervous system to calm overactive nerve signals that cause muscles to tighten. This helps improve muscle movement and comfort for daily activities.
Full Tizanidine guide →How Each Drug Works
Tizanidine
Tizanidine is a central alpha-2-adrenergic receptor agonist and presumably reduces spasticity by increasing presynaptic inhibition of motor neurons. The effects of tizanidine are greatest on polysynaptic pathways. The effect of these actions is thought to reduce facilitation of spinal motor neurons.
Approved Uses (Indications)
Morphine
INDICATIONS AND USAGE Opium tincture is useful for the treatment of diarrhea.
Tizanidine
Tizanidine Tablets, USP is a central alpha-2-adrenergic agonist indicated for the management of spasticity. Because of the short duration of therapeutic effect, treatment with Tizanidine Tablets, USP should be reserved for those daily activities and times when relief of spasticity is most important [see Dosage and Administration ]. Tizanidine Tablets, USP is a central alpha-2-adrenergic agonist indicated for the management of spasticity. Because of the short duration of therapeutic effect, treatment with Tizanidine Tablets, USP should be reserved for those daily ac…
Side Effects
Morphine
Tizanidine
Cost Comparison
Morphine
$200–$600/month
As there is no generic available, patients should look for manufacturer patient assistance programs or discount cards to help reduce the cost of Opium Tincture Deodorized.
Tizanidine
$4–$25/month
Tizanidine is available as an affordable generic. Patients can often find significant savings by using discount cards like GoodRx or checking prices at different pharmacies.
Compare prices for Morphine and Tizanidine
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Medical Disclaimer
The information on RxGuide is intended for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician, pharmacist, or other qualified health provider with any questions you may have regarding a medical condition or medication. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.