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Doctor insights on: Antihistamine Decongestants

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Dr. Paul Carter
601 doctors shared insights

Antihistamine (Definition)

Sedating and non-sedating antihistamines prevent and treat allergic reactions, and are ...Read more


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Can like to know if both antihistamine and decongestant thicken mucus?

Can like to know if both antihistamine and decongestant thicken mucus?

Antihistamines: do dry up secretions, decongestants constrict blood vessels so less blood flows into the area and congestion is relieved, drink plenty of water/fluids while on those drugs, avoid decongestants if having high blood pressure ...Read more

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Why can not use antihistamines and decongestants in patient with thyroid disease ? What is the machanism of action? What medicine can use to relief ?

Decongestants may: Decongestants may complicate and exacerbate hyperthyroid states. In general I do not recommend oral decongestants to any age group as there is a higher risk of cardiovascular disease with decongestant use. Antihistamines alone may be used in thyroid disease in general. ...Read more

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Are there any antihistamines or decongestants you can take that will not raise your heart rate?

Yes: All decongestants can potentially raise your heart rate as would be the first-generation antihistamines such as Benadryl (diphenhydramine) or hydroxyzine. The new-generation antihistamine such as fexofenadine or Loratadine is not expected to affect the heart rate. ...Read more

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Do histamines (not antihistamine medications) make you drowsy? Antihistamines (no decongestants added) seem to make me more alert when allergies flare

Yes: Histamine is a substance released during an allergic attack and can cause drowsiness. Some of the older generation anti-histamine agents (like benedryl) can cause drowsiness because they can pass the "blood brain" barrier and cause a direct effect on thinking. In rare cases in adults, antihistamines can cause agitation. ...Read more

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Will taking an antihistamine w/decongestant before sinus CT give false results?

Will taking an antihistamine w/decongestant before sinus CT give false results?

No: Decongestants reduce the swelling in the nose, but do not clear out the sinuses to the point of changing ct results. Other pathologies will be completely unaffected. ...Read more

Dr. Thomas Josa
271 doctors shared insights

Decongestant (Definition)

Decongestants are a kind of common ...Read more