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Doctor insights on: Different Antihistamines

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Is it ok to take three different antihistamines?

Is it ok to take three different antihistamines?

Not a good idea: Unless specifically instructed by an allergist. I have only seen people on more than one antihistamine for severe recurrent hives (urticaria). Taking too many antihistamines at once can cause issues with urinary retention and other problems. ...Read more

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Benadryl (Definition)

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


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How many weeks does it take for claritin (loratadine) 10mg to work? How long should I give it a try before deciding to switch to a different antihistamine?

A few hours: Claritin (loratadine) should start working within a couple of hours. If it doesn't not help at all, then switching to another won't do you much good. If it does help somewhat, then you may try the other alternatives which may possess more antihistamine effect than Claritin (loratadine). ...Read more

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Why are the mg dosage of antihistamines different? Allegra is 180mg , Claritin (loratadine) is 5mg , and zyrtec is 10mg.

Why are the mg dosage of antihistamines different? Allegra is 180mg , Claritin (loratadine) is 5mg , and zyrtec is 10mg.

Potency: Although the doses are not equal they are equivalent in potency. That is the drugs will have equal efficacy at controlling congestion, runny nose etc. The doses are different because they are different compounds and those compounds are of different weight and size. ...Read more

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If I have an allergy to one antihistamine, is it more likely to also be allergic to another? Even though they r different chemicals?

If I have an allergy to one antihistamine, is it more likely to also be allergic to another? Even though they r different chemicals?

Not necessarily: Most people will tolerate a different antihistamine even if they had a reaction to another. The exception might be antihistamines such as zyrtec and xyzal (levocetirizine) which are closely related. ...Read more

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Is it possible to be allergic to all antihistamines (hives)? I see hives 90mins after taking 3 different antihit's on different days.

Is it possible to be allergic to all antihistamines (hives)? I see hives 90mins after taking 3 different antihit's on different days.

See a dermatologist: Why taking antihistamine? When you see the dr be prepared to name all antihistamines tried. Exact names. It is possible but very unlikely to get hives from antihistamines: they are used to stop hives. ...Read more

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35 yr-old with round-shaped skin lesions that come and go for 14 years, unresponsive to antifungals, and negative for "fungal, viral, or yeast".....?

Urticaria (hives): Typical description of chronic urticaria refractory to antihistamines. An Allergist will get some bloodwork to rule out some potential underlying causes and then prescribe treatment. There are several options and relief can be obtained in no time. ...Read more

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I gave expired antihistamine syrup to my 30 months old son incidentally...Is it dangerous?What s the side effect on him?

I gave expired antihistamine syrup to my 30 months old son incidentally...Is it dangerous?What s the side effect on him?

Expired drugs: There should be no side effects as expiration is usually based on loss of drug effectiveness. Drug companies err on the side of shortening times to expiration. Actually many drugs are effective long after expiration dates. Expired drugs are commonly used effectively by volunteer organizations when no other drugs are available. Relax! ...Read more

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What are the common uses of antihistamine?

Antihistamine 4 itch: Antihistamines (ah) block histamine receptors and stop histamine from causing itching and swelling. They are mainly used to treat allergies and hives. Some are sedating; those are used as sleep aids. Many otc sleep meds contain Diphenhydramine (benadryl). ...Read more

Dr. Paul Carter
601 doctors shared insights

Antihistamine (Definition)

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