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Doctor insights on: Different Types Of 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

Benadryl (Definition)

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


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Is doxepin a type 2 antihistamine?

Is doxepin a type 2 antihistamine?

Strong antihistamine: Doxepin is an effective but sedating tricyclic antidepressant. This drug's sedating effect is significantly due to its powerful antihistamine effects. Most recently it has been marketed at lower dosages as a sleep medication. ...Read more

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Is it safe to take two types of antihistamines togeather?

Is it safe to take two types of antihistamines togeather?

Probably not: It is not a good idea because of the increased risk of side effects from taking multiple similar meds. ...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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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?

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?

Try for a few days: Antihistamines begin to work in less than an hour but a person may not feel significant relief for a few days. Claritin tends to be one of the weaker non-drowsy antihistamines. Others available without a prescription are Zyrtec, Allegra and Xyzal. If antihistamines are still not working then an evaluation by an allergist can be helpful to determine the cause of symptoms ...Read more

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Is it ok to take any type of antihistamines when already taking Acamprosate?

Is it ok to take any type of antihistamines when already taking Acamprosate?

Yes: But why? Is it because a side effect of the drug, like itching? If so, better stop the Acamprosate and call/see your doctor, wish you well ...Read more

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Is it OK to take multiple types of antihistamines within a 24-hour period? Nothing seems to work as long as advertised.

Is it OK to take multiple types of antihistamines within a 24-hour period? Nothing seems to work as long as advertised.

DETAILS?????: What are you treating? Which antihistamines? How many of each? There are easy answers after the details are given. No answer is possible without this information. For chronic urticaria I may manage it with 10 or 20mg cetirizine (Zyrtec) in AM and hydroxyzine at bedtime. I never use Benadryl (diphenhydramine) except as a sleeping pill. ...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.

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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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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Do the antihistamine nose sprays and the steroid sprays lose their effectiveness over time? Should I alternate, using one type of spray each month?

Do the antihistamine nose sprays and the steroid sprays lose their effectiveness over time? Should I alternate, using one type of spray each month?

Should not: These sprays should not lose their effectiveness over time. Some people need both in combination. I would suggest using the antihistamine spray and adding in the steroid spray when your symptoms are not controlled. It may take a couple of days to feel the full effect of the steroid spray. ...Read more

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What type of allergies cause skin itching and bladder problems? Can't see an allergist because I have to take antihistamine to curb symptoms

What type of allergies cause skin itching and bladder problems? Can't see an allergist because I have to take antihistamine to curb symptoms

U can still see: An allergist while on antihistamine, skin testing isn't indicated in every case. While I can't see any relation of skin itching and bladder problems, the bladder problem can be a side effect to using an antihistamine. Good history and physical exam are needed for good management of your case, best wishes ...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?

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

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Is Flixonase an antihistamine?

Steroid Nasal Spray: Flixonase or Flonase (fluticasone proprionate) is a steroid nasal spray commonly used to treat allergic rhinitis by decreasing the allergic inflammation in the nasal mucosa. It is not an antihistamine. ...Read more

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Is there an antihistamine cream?

Is there an antihistamine cream?

Yes, but avoid: Benadryl (diphenhydramine) cream is available. While some people find temporary relief for insect bites with this, in general it is not very effective compared to other antihistamines taken as pills or tabs. For generalized rash, it really doesn't make sense. ...Read more

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Does antihistamine make you drowsy?

Older ones do: First generation antihistamines (benadryl, clor-pheramine, atarax) cross the blood brain barrier and cause lethargy.
Second generation (allegra, claritin, zyrtec, xyzal, (levocetirizine) clarinex) cause the blood brain barrier at a much lesser amount and more targeted to the h1 receptor. ...Read more

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Can you use antihistamine and wine?

Can you use antihistamine and wine?

Not a good idea: Antihistamines (especially the older ones such as benadryl) can cause drowsiness and impairment and this can be worsened by the effect of alcohol even at regular doses. There are other allergy medications available that can be taken if a glass of wine is desired. ...Read more

Dr. Paul Carter
648 Doctors shared insights

Antihistamine (Definition)

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