Drug interactions
Cyclobenzaprine + OnabotulinumtoxinA
Severity: Minor
Cyclobenzaprine and OnabotulinumtoxinA: minor interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Cyclobenzaprine is a centrally acting muscle relaxant with anticholinergic properties, and onabotulinumtoxinA weakens muscle by blocking acetylcholine release. Combined use could add to muscle weakness, and distant spread of toxin effect may be harder to recognise. The clinical evidence is limited and largely theoretical.
What this interaction means in plain words
Cyclobenzaprine and OnabotulinumtoxinA have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Cyclobenzaprine belongs to Musculoskeletal; OnabotulinumtoxinA belongs to Musculoskeletal.
Why it happens
Additive muscle-weakening effects through different mechanisms (central muscle relaxation plus peripheral blockade of acetylcholine release).
What to do
Monitor for excessive weakness, swallowing or breathing difficulty after injection, especially with high toxin doses. Reduce or stop cyclobenzaprine if generalised weakness develops.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Cyclobenzaprine
- Cyclobenzaprine + Isocarboxazid Contraindicated
- Cyclobenzaprine + Linezolid Contraindicated
- Cyclobenzaprine + Phenelzine Contraindicated
- Cyclobenzaprine + Safinamide Contraindicated
- Cyclobenzaprine + Selegiline Contraindicated
- Cyclobenzaprine + Selegiline transdermal Contraindicated
Other interactions of OnabotulinumtoxinA
Frequently asked questions
Can I take Cyclobenzaprine with OnabotulinumtoxinA?
MediHelp rates the interaction as minor. Cyclobenzaprine and OnabotulinumtoxinA have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Cyclobenzaprine is a centrally acting muscle relaxant with anticholinergic properties, and onabotulinumtoxinA weakens muscle by blocking acetylcholine release. Combined use could add to muscle weakness, and distant spread of toxin effect may be harder to recognise. The clinical evidence is limited and largely theoretical.
How serious is the interaction between Cyclobenzaprine and OnabotulinumtoxinA?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for excessive weakness, swallowing or breathing difficulty after injection, especially with high toxin doses. Reduce or stop cyclobenzaprine if generalised weakness develops.
What other medicines interact with Cyclobenzaprine?
MediHelp also lists interactions of Cyclobenzaprine with, for example, Isocarboxazid, Linezolid, Phenelzine. The full list is on the Cyclobenzaprine page.
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