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Can I take more than one antihistamine

A 50-year-old male asked:
Dr. Al Hegab
Dr. Al Hegabanswered
Allergy and Immunology 40 years experience
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
Allergy and Immunology 23 years experience
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
A 31-year-old member asked:
Dr. Thomas Shen
Allergy and Immunology 29 years experience
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
Allergy and Immunology 34 years experience
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
A 57-year-old female asked:
Dr. Justin Greiwe
A Verified Doctoranswered
Allergy and Immunology 12 years experience
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
Allergy and Immunology 57 years experience
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
A 45-year-old member asked:
Dr. John Chiu
Allergy and Immunology 57 years experience
Yes: Antihistamines are well tolerated even when the dose is doubled.
A 47-year-old member asked:
Dr. Steven Hill
Family Medicine 23 years experience
Yes: Actifed is more of decongestant. Yes it may harm you.
A 23-year-old male asked:
Dr. Oscar Novick
Pediatrics 58 years experience
Zyrtec (cetirizine): You can take another xyrtec but you may become very sleepy.
A 22-year-old female asked:
Dr. Al Hegab
Dr. Al Hegabanswered
Allergy and Immunology 40 years experience
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