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For What Length Of Time Will Antihistamines Remain Active In The Body
Depends : It depends on the antihistamine. There are fast acting antihistamines such as Benadryl and Atarax also known as Diphenhydramine and Hydroxyzine that generally last approximately 6 hours. Longer acting antihistamines such as Allegra and zyrtec also known as fexofenadine and Cetirizine generally last approximately 24 hours. ...Read moreSee 1 more doctor answer
Is it possible for your body to not produce antihistamines, so you end up with too much active histamine?
Context?: I'm not sure about what u mean by. ...Read more
I'm allergic to cold. Every time i swim, my whole body would appear reddish rash. How do I resist the rash? Can i take an antihistamine before swimmg?
Be cautious: It sounds like you may have cold urticaria. Antihistamines may help but be cautious because severe cold reactions may not be limited to skin rashes. Check with your dermatologist. ...Read more
I've had chronic itch with no rash all over my body for quite some time. It responds very well to antihistamines. What could be the cause?
How long does it take antihistamines to get out of your system? I was told not to take any for 1 week, but inadvertently did. Is 5 days enough time?
Antihistamines: Safety of high dose medications is often unknown. Our experience comes from case reports of persons who intentionally or accidentally consumed unusually excessive quantities. When Claritin was first investigated, safety studies were done at 40 mg (4 times the current recommended dose). We take 10 mg because effectiveness is not significantly different between 10 mg and 40mg. ...Read moreSee 1 more doctor answer
45-90 minutes: Antihistamines taken by mouth begin to work in about an hour but may take longer if you've just eaten. Antihistamine nasal sprays (astepro, patanase) begin to work in 30 minutes. An antihistamine injection, usually diphenhydramine, sometimes given for a severe allergic reaction or anaphylaxis begins to work in a few minutes. ...Read moreSee 1 more doctor answer
No: Antihistamines are a class of medication used since the 1940s. They are used to treat allergic conditions and are very safe. The newer generation antihistamines have even less side effects compared to first generation or old antihistamines. ...Read more
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