7 doctors weighed in:

Why do muscle relaxer pills help with my allergies?

7 doctors weighed in
Dr. Paul Carter
Internal Medicine - Allergy & Immunology
3 doctors agree

In brief: Antihistamine action

One muscle relaxer, cyclobenzaprine, has a chemical structure very similar to cyproheptadine, an antihistamine.
Cyclobenzaprine also has similarities to tricyclic antidepressants. Either way, it may have some blocking action on h1 histamine receptors which may help your allergy symptoms. It is more efficient to use a medication designed for this effect, like zyrtec or allegra (fexofenadine).

In brief: Antihistamine action

One muscle relaxer, cyclobenzaprine, has a chemical structure very similar to cyproheptadine, an antihistamine.
Cyclobenzaprine also has similarities to tricyclic antidepressants. Either way, it may have some blocking action on h1 histamine receptors which may help your allergy symptoms. It is more efficient to use a medication designed for this effect, like zyrtec or allegra (fexofenadine).
Dr. Paul Carter
Dr. Paul Carter
Thank
Dr. James Sublett
Internal Medicine - Allergy & Immunology
2 doctors agree

In brief: Not sure

You would not expect any effect if truly allergies.
Maybe the symptoms you are having are not allergic.

In brief: Not sure

You would not expect any effect if truly allergies.
Maybe the symptoms you are having are not allergic.
Dr. James Sublett
Dr. James Sublett
Thank
Dr. Yoram Padeh
Internal Medicine - Allergy & Immunology

In brief: Unclear

Muscle relaxers are not known to improve allergy symptoms.

In brief: Unclear

Muscle relaxers are not known to improve allergy symptoms.
Dr. Yoram Padeh
Dr. Yoram Padeh
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