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can I take more than one antihistamine

A 50-year-old male asked:
Dr. Al Hegab
Dr. Al Hegab answered
39 years experience Allergy and Immunology
With caution : You can, but better be under doctor's supervision if you need more than one zyrtec tablet a day,. If nasal symptoms are bothersome, OTC steroid nas ... Read More
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A 26-year-old male asked:
Dr. Michael Palumbo
22 years experience Allergy and Immunology
Xyzal (levocetirizine) and Clarinex: From experience some of the newer antihistamines such as Xyzal (levocetirizine) and Clarinex seem to be effective for longer time periods. Most antihi ... Read More
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A 31-year-old member asked:
Dr. Thomas Shen
28 years experience Internal Medicine
Unclear: Different antihistamines have different potencies. 10 mg of Zyrtec is equivalent to 180mg of Allegra (fexofenadine). Mg doseage as in all medicines ... Read More
A 34-year-old member asked:
Dr. Michael P Vaughn
33 years experience Allergy and Immunology
Antihistamines: Safety of high dose medications is often unknown. Our experience comes from case reports of persons who intentionally or accidentally consumed unusual ... Read More
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A 57-year-old female asked:
Dr. Justin Greiwe
11 years experience Allergy and Immunology
Yes but...: Antihistamines can be taking twice a day safely if required but there are other treatments available. If by allergic reaction you are referring to sea ... Read More
A 19-year-old female asked:
Dr. John Chiu
Dr. John Chiu answered
56 years experience Allergy and Immunology
Likely Ok: Antihistamines have a high safety margin although the older antihistamines may have more side effects. It is unusual to have mistakenly taken 3 pills ... Read More
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A 45-year-old member asked:
Dr. John Chiu
Dr. John Chiu answered
56 years experience Allergy and Immunology
Yes: Antihistamines are well tolerated even when the dose is doubled.
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A 47-year-old member asked:
Dr. Steven Hill
22 years experience Family Medicine
Yes: Actifed is more of decongestant. Yes it may harm you.
A 23-year-old male asked:
Dr. Oscar Novick
57 years experience Pediatrics
Zyrtec (cetirizine): You can take another xyrtec but you may become very sleepy.
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A 22-year-old female asked:
Dr. Al Hegab
Dr. Al Hegab answered
39 years experience Allergy and Immunology
No: Those preparations contain multiple drugs similar to thera-flu, the problem isn't with antihistamines only, other components could interact, or intera ... Read More

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