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Doctor insights on: Antihistamines Dosage

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Is it ok to take Clorazepate with an antihistamine? The dosage is 3.75mg.

Is it ok to take Clorazepate with an antihistamine? The dosage is 3.75mg.

Watch for drowsiness: The combination can cause increased drowsiness. Please do not drive while taking both. Avoid the use of alcohol in combination. The clorazepate can be habit forming. ...Read more

Benadryl (Definition)

Diphenhydramine is a sedating antihistamine which is a kind of antihistamine type drug (common ...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 (loratadine) 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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What is maximum dosage of antihistamine for hives, 10 mg. is not providing relief after 1 mon.

What is maximum dosage of antihistamine for hives, 10 mg. is not providing relief after 1 mon.

Can increase dose: You can increase the dose of a non-sedating antihistamine like cetirizine to 10mg twice a day if need be. Dosing can be increased even more in some situations. You can also consider adding H2 blockers. Talk to your Allergist about additional treatment options to get better control of hives. ...Read more

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What dosage of antihistamine should I take to resolve a mild food allergy reaction?

What dosage of antihistamine should I take to resolve a mild food allergy reaction?

Any recommended: Dosage of any OTC antihistamine, either first or second generation, will be effective, more important though is avoidance of re-exposure to the offending food till problem is sorted out. Keep antihistamine handy for accidental exposure, if severe reaction, keep epipen (epinephrine) handy too, see your doctor/allergist if the problem is bothersome, best wishes ...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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I've heard at low doses, Seroquel (quetiapine) acts as a strong antihistamine. Is this true & what is the dose?

As low as 25mg: There are folk saying this - Discuss it w/ your doctor too. http://www.crazyboards.org/forums/index.php/topic/40642-seroquels-antihistamine-action/ Best! ...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