Combining Fentanyl and Methocarbamol is a major interaction and should generally be avoided without close medical supervision.
This additive CNS depression can manifest as profound sedation, dizziness, confusion, and psychomotor impairment. Most critically, it significantly increases the risk of severe respiratory depression, which can be life-threatening. Patients may also experience hypotension and impaired coordination.
Mechanism: Fentanyl, an opioid analgesic, primarily acts on mu-opioid receptors in the central nervous system (CNS) to produce analgesia, sedation, and respiratory depression. Methocarbamol, a centrally acting muscle relaxant, also exerts its effects through general CNS depression, though its precise mechanism is not fully understood. The co-administration of these two agents results in an additive depressant effect on the CNS.
Fentanyl vs. Methocarbamol
Compare Fentanyl and Methocarbamol: mechanism of action, indications, side effects, cost, and which may be right for you.
Drug A
Fentanyl
Fentanyl
Opioid Analgesics
RxDrug B
Methocarbamol
Methocarbamol
Skeletal Muscle Relaxants
RxQuick Comparison
| Category | Fentanyl | Methocarbamol |
|---|---|---|
| Drug Class | Opioid Analgesics | Skeletal Muscle Relaxants |
| Rx Status | Rx | Rx |
| Generic Available | No | No |
| Typical Cost | $150–$600/month | $15–$40/month |
Fentanyl Overview
FENTANYL (brand name: FENTANYL) is a Opioid Analgesics. 1 INDICATIONS AND USAGE Fentanyl transdermal system is indicated for the management of severe and persistent pain in opioid-tolerant patients, that requires an opioid analgesic and that cannot be adequately treated with alternative options, including immediate-release opioids. Patients considered…
Full Fentanyl guide →Methocarbamol Overview
Methocarbamol is a medication used to help relieve discomfort from acute, painful muscle and bone conditions, often alongside rest and physical therapy. It works by affecting the central nervous system to reduce muscle spasms and pain, though it doesn't directly relax the muscles themselves.
Full Methocarbamol guide →How Each Drug Works
Fentanyl
Fentanyl is an opioid agonist. Fentanyl interacts predominately with the opioid mu-receptor. These mu-binding sites are distributed in the human brain, spinal cord, and other tissues.
Approved Uses (Indications)
Fentanyl
Fentanyl transdermal system is indicated for the management of severe and persistent pain in opioid-tolerant patients, that requires an opioid analgesic and that cannot be adequately treated with alternative options, including immediate-release opioids. Patients considered opioid-tolerant are those who are taking, for one week or longer, at least 60 mg morphine per day, 25 mcg transdermal fentanyl per hour, 30 mg oral oxycodone per day, 8 mg oral hydromorphone per day, 25 mg oral oxymorphone per day, 60 mg oral hydrocodone per day, or an equianalgesic dose of another op…
Methocarbamol
INDICATIONS AND USAGE Methocarbamol tablets are indicated as an adjunct to rest, physical therapy, and other measures for the relief of discomfort associated with acute, painful musculoskeletal conditions. The mode of action of methocarbamol has not been clearly identified, but may be related to its sedative properties. Methocarbamol does not directly relax tense skeletal muscles in man.
Side Effects
Fentanyl
Methocarbamol
Cost Comparison
Fentanyl
$150–$600/month
As a brand-only medication, fentanyl can be expensive. Patients should check for manufacturer coupons or patient assistance programs, and compare prices at different pharmacies using discount cards.
Methocarbamol
$15–$40/month
Methocarbamol is available as a low-cost generic. Using discount cards like GoodRx can further reduce the cost, often bringing it under $10 per month.
Compare prices for Fentanyl and Methocarbamol
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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.