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Doctor insights on: Classes Of Antihistamines

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In class,at home,1-2/day ,Hives are oftenly occure on my full body ,tell me the best way to resolve this problem ,even antihistamines doesn't work .

In class,at home,1-2/day ,Hives are oftenly occure on my full body ,tell me the best way to resolve this problem ,even antihistamines doesn't work .

Larger dose: Try a non-sedating antihistamine up to 4 x daily ( yes much larger than what is used for hay fever). If this does not help. you may add a H2 antagonist such as Pepcid or ranitidine twice daily. If this happens only at home or at school, then there is something in that environment causing the hives. Consult an allergist if the above measures didn't help. ...Read more

Benadryl (Definition)

Diphenhydramine is a sedating antihistamine which is a kind of antihistamine type drug (common ...Read more


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When ever I'm not taken an antihistamine like Clariten or Zyrtec and I am walking fast like to class I get extremely itchy like in my thigh region ?

When ever I'm not taken an antihistamine like Clariten or Zyrtec and I am walking fast like to class I get extremely itchy like in my thigh region ?

Itchy: You might have dermatographism which is a physical urticaria from rubbing the skin. Rubbing, pressure or scratching your skin can cause a hive or wheal to develop which can be intensely itchy Your doctor can test you for this if you are not taking antihistamines at the time you are examined. Antihistamines are an effective treatment of this condition ...Read more

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Can i take one antihistaminic at moorning and another one at nigt? for alergic reactions.

Can i take one antihistaminic at moorning and another one at nigt? for alergic reactions.

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 seasonal allergies, the gold-standard therapy is daily nasal steroid sprays and/or antihistamine nasal sprays. Nasal saline rinses, avoidance measures, and if refractory to treatment, allergy shots can also be helpful. See an Allergist for more details. ...Read more

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What is the highest dosage of antihistamine that one person can take at one time?

What is the highest dosage of antihistamine that one person can take at one 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 more

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When should you take an antihistamine?

When should you take an antihistamine?

Multiple reasons: Depending on the type of antihistamine used they can be used to treat things such as allergy symptoms, nausea, dizziness, motion sickness, anxiety, itching, and difficulty sleeping. ...Read more

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Can i die by taking too many antihistamine tablets?

Can i die by taking too many antihistamine tablets?

Taking lethal over: Dose would do that. Lethal overdoses of antihistamines are rare. Are you considering taking an overdose of antihistamines? If so, please get help right away. You can use national suicide hotlines 24/7 at 1-800-suicide (1-800-784-2433) or 1-800-273 – talk (1-800-273-8255). If you have accidentally taken too many antihistamines please contact 1-800-222-1222 (poison control hotline). Take care. ...Read more

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What is the average time needed for an antihistamine to begin to work?

What is the average time needed for an antihistamine to begin to work?

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 more

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What is the best OTC antihistamine?

OTC antihistamines: The second generation zyrtec, allergra or Claritin are comparative. None are perfect. Zyrtec is slightly more likely to make you tired ot sleepy. Often one works a little better than another and i adise you to test all three. ...Read more

Dr. Paul Carter
593 doctors shared insights

Antihistamine (Definition)

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