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Doctor insights on: Zyrtec Doesn T Work

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What can I do if my allergies are really working on me, can I take two zyrtec (cetirizine) when one doesn't work?

What can I do if my allergies are really working on me, can I take two zyrtec (cetirizine) when one doesn't work?

Allergies: Doubling your antihistamine may not be answer to treat your bad allergies, you should consult an allergist to manage your allergies better, you may need a different type of medication, such as a nasal spray if you are congested. ...Read more

Dr. John Chiu
575 Doctors shared insights

Cetirizine (Definition)

Ceftirizine is the generic name of an antihistamine previously marketed under the ...Read more


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I've been taking Zyrtec (cetirizine) for years. This year it doesn't seem to be working for outdoor allergies. Would changing to a different med work better?

I've been taking Zyrtec (cetirizine) for years. This year it doesn't seem to be working for outdoor allergies. Would changing to a different med work better?

Possible but: I suspect that either you have become increasingly more allergic or the allergen exposure has gone up this year. Try a nasal steroid. If that still does not do the job, see an allergist. ...Read more

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How long for zyrtec (cetirizine) to work?

About 1 hour: The onset of action for zyrtec (cetirizine) to clinically improve symptoms is about 1 hour.
The reference is listed here:
http://www. Ncbi. Nlm. Nih. Gov/pubmed/11770694. ...Read more

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How does zyrtec (cetirizine) (reactine) 10 mg work?

How does zyrtec (cetirizine) (reactine) 10 mg work?

Zyrtec (cetirizine) = Cetirizine: Zyrtec (cetirizine) is a long action, non-sedating antihistamine. It works well for many people. It functions by blocking histamine release from cells, thereby stopping allergic symptoms. ...Read more

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Is Xyzal unlikely to work for someone for whom Zyrtec does not work?

Is Xyzal unlikely to work for someone for whom Zyrtec does not work?

Worth a Trial: Both are second generation antihistamines and have the same mode of action. But these are different compounds and for some people swithing helps with their symptoms. It is worth trying.Xyzal is available by prescription and zyrtec is over the counter ...Read more

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Does chlor-trimeton work just as well as zyrtec (cetirizine)? What's cheaper?

Does chlor-trimeton work just as well as zyrtec (cetirizine)? What's cheaper?

What is cheaper: Yes. Chlortrimeton is cheaper but likely to give you a dry mouth, dry eyes and make you sleepy. ...Read more

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I took 2 clairton a day for 2 years and then had to switch to zyrtec (cetirizine) for 1.5 years I think its not working if I switch back to clairtin will it work?

I took 2 clairton a day for 2 years and then had to switch to zyrtec (cetirizine) for 1.5 years I think its not working if I switch back to clairtin will it work?

Probably not: Zyrtec (cetirizine) is a more effective antihistamine than Claritin (loratadine). Antihistamines do not become less effective with prolonged use so if your symptoms are worse while in zyrtec then the underlying condition has become more severe so the same dose of zyrtec is unable to control the symptoms. Call you doctor and consider consulting a specialist in allergy & immunology. ...Read more

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Long term use of children's Benadryl (diphenhydramine) vs zyrtec. Which one works best with the least chance of becoming tolerant or non responsive? Should I alternate

Long term use of children's Benadryl (diphenhydramine) vs zyrtec. Which one works best with the least chance of becoming tolerant or non responsive? Should I alternate

Allergy Meds: One should see an allergist to identify the allergens ang get appropriate treatment. Long term use of Benadryl (diphenhydramine) or zurtec specially at young age without physician supervision is harmful. ...Read more

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Zyrtec (cetirizine) works best for me but also is very sedating for the next 24 hrs. Can I split the pill and take a lower dose (5 mg) or even 2.5 mg children's dose? Would those doses be less sedating?

Zyrtec (cetirizine) works best for me but also is very sedating for the next 24 hrs. Can I split the pill and take a lower dose (5 mg) or even 2.5 mg children's dose? Would those doses be less sedating?

Possibly but...: Decreasing the dose may also decrease the sedative effects. But it will presumably also decrease the main effects as well. Consider trying other medications, and also ensure that you are not taking zyrtec (cetirizine)-d which is more sedating that zyrtec (cetirizine). ...Read more

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Whenever I get hot I start to itch, I had hives prior but they're gone I'm currently on zantac (ranitidine) and Zyrtec (Costco brand). It doesn't seem to work.

Whenever I get hot I start to itch, I had hives prior but they're gone I'm currently on zantac (ranitidine) and Zyrtec (Costco brand). It doesn't seem to work.

Cholinergic?: There is a condition known as cholinergic urticaria (small bumps) which occurs during the cooling down period after a rise in core body temperature (hot shower, exercise, stress etc). If this fits your pattern, then try taking the antihistamine up to every 8 hrs to see if this may work. ...Read more

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I have very bad allergies. Allegra (fexofenadine) 180 use to work but it wears off fast. Zyrtec doesn't do anything what should I do. Always congested & feeling bad?

I have very bad allergies. Allegra (fexofenadine) 180 use to work but it wears off fast. Zyrtec doesn't do anything what should I do. Always congested & feeling bad?

Other meds: Antihistamines do not manage congestion well which is why decongestants are often added. Singulair (montelukast) and nasal steroids manage all allergy symptoms and in head to head comparisons steroid sprays control symptoms better than oral antihistamines. Topical spray antihistamines are also an option. Allergy shots help reduce or eliminate medications in 2/3 of patients so may need to see allergist. ...Read more

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I have a swollen lymph node below my ear. I take Flonase and Zyrtec. The doc wants to refer me to an ent if amox doesn't work. What could this be?

I have a swollen lymph node below my ear. I take Flonase and Zyrtec. The doc wants to refer me to an ent if amox doesn't work. What could this be?

Reactive Lymph Node: I sounds like you have a reactive Lymph Node to an ENT infection. This may come from an infection of the ear, the throat or the sinuses, or even a sore on the head. Lymph nodes are part of your immune system and help to clear infections, which is why they swell up. Usually they swell for a few days, and then settle after a week or 2. If more occur, then go back to your doctor ...Read more

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I get headaches from allergies. Can I take Claritin (loratadine) and zyrtec at the same time? Claritin (loratadine) didn't work alone when I traveled away from home.

I get headaches from allergies. Can I take Claritin (loratadine) and zyrtec at the same time? Claritin (loratadine) didn't work alone when I traveled away from home.

Yes, but: Both Claritin (loratadine) and zyrtec (cetirizine) are new generation antihistamines. While there is no harm to using them together, there is likely no added benefit either. The most effective treatment for nasal allergies is the topical nasal steroid sprays such as qnasl, flonase, veramyst, nasonex, (mometasone) etc if a person doesn't have relief with an antihistamine alone. ...Read more

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Zyrtec, claritin, singular, and allegra don't work on my 7 yr olds allergies at night (nasal drip & cough) only benedryl. Can he take it every night?

Zyrtec, claritin, singular, and allegra don't work on my 7 yr olds allergies at night (nasal drip & cough) only benedryl. Can he take it every night?

Dose?: Zyrtec & Benadryl (diphenhydramine) are very similar. He should get similar relief if he's taking the right dose for his weight. Benadryl (diphenhydramine) will make him more drowsy. You should talk to his doctor about an rx nose spray to control allergies like Flonase or nasonex. ...Read more

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As you all know, Day 11 of a cold. And today at work I was exposed to alot of dust: now I def can't stop coughing, clearing throat. Tried zyrtec (cetirizine).Help?

As you all know, Day 11 of a cold. And today at work I was exposed to alot of dust: now I def can't stop coughing, clearing throat. Tried zyrtec (cetirizine).Help?

Not unusual: Sometimes a cold can cause prolonged irritation in the airways making you cough. However a cold may be complicated by a sinus infection especially if the symptoms have gone beyond 10 days. You should see your doctor to rule out a sinus infection ...Read more

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Experiencing prolonged chest congestion. X-Rays, blood tests negative. Antibiotics didn't work. Have been trying Zyrtec at night, together with nasal spray Qnasl (beclomethasone dipropinat) to reduce post-nasal drip. After one week, cough is less persiste

Experiencing prolonged chest congestion. X-Rays, blood tests negative. Antibiotics didn't work. Have been trying Zyrtec at night, together with nasal spray Qnasl (beclomethasone dipropinat) to reduce post-nasal drip. After one week, cough is less persiste

Right direction: Common causes of cough, other than infection are reflux and post-nasal drip. It sounds like the evaluation has looked for the more serious causes, but if the problem persists, continue to work with your doctor. Sometimes a pulmonary doctor can help with more resistant coughing. ...Read more

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I have horrible allergies right now (runny nose, itchy eyes, itchy throat) I took claritin (loratadine) & zyrtec they didn't work what do you suggest I try now?

I have horrible allergies right now (runny nose, itchy eyes, itchy throat) I took claritin (loratadine) & zyrtec they didn't work what do you suggest I try now?

Allergies: 21 year old lady with allergies unresponsive to OTC antihistamines. If blocking histamine has not worked, try using a nasal corticosteroid spray such as Flonase which you can buy over the counter. You should also try to avoid allergen triggers and visit a specialist in Rheumatology who can use an allergy panel to diagnose your specific allergy and possibly do immunotherapy. Good luck. ...Read more

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Does zyrtec (cetirizine) work on stuffed up nose?

Does zyrtec (cetirizine) work on stuffed up nose?

A little: Zyrtec is a new generation antihistamine and is very good at treating itching, sneezing, runny nose. It is less effective for severe nasal congestion. The product zyrtec-d contains a decongestant that may help. Also, the topical nasal steroid sprays are even more effective with less side effects for nasal congestion associated with allergies. ...Read more

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I am on topamax (topiramate) and zyrtec daily. Recently I have been getting really overheated at work quick. Last Fri I got too hot and felt nauseous and felt like I may pass-out but I finished my task.?

I am on topamax (topiramate) and zyrtec daily. Recently I have been getting really overheated at work quick. Last Fri I got too hot and felt nauseous and felt like I may pass-out but I finished my task.?

Side effects: Topamax (topiramate) is known for causing oligohydrosis, a condition with decreased sweating and elevated body temperature, Zyrtec can exacerbate this problem, tell your doctor ASAP about your condition ...Read more

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Can zyrtec (cetirizine) work with food allergies?

Can zyrtec (cetirizine) work with food allergies?

No: No, zyrtec (cetirizine) does not work to prevent you from getting an allergic reaction to food or to treat food allergies. Food allergies can present with different clinical symptoms and can be life threatening. Currently strictly avoiding the food is the only treatment. Only a few centers do food desensitization. If you have real food allergy, you should see an allergist specialist. ...Read more

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I have very bad seasonal allergies. I have tried everything, Zyrtec, Claritin (loratadine) and Allegra. Nothing works, what can I take?

I have very bad seasonal allergies. I have tried everything, Zyrtec, Claritin (loratadine) and Allegra. Nothing works, what can I take?

See an allergist: If none of these OTC meds worked, unlikely that anything else will, you need to be evaluated, good history and physical examination. See your doctor first for initial evaluation, who would refer you or check aaaai. Org or acaai. Org for an allergist in your area, best wishes ...Read more

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Rare urticaria. Why does zyrtec work well for it but when adding allegra (fexofenadine) the hives come more? Is allegra (fexofenadine) cancelling zyrtec out on some gene level?

It shouldn't: Zyrtec and Allegra (fexofenadine) work in similar fashion and actually the result should be additive. I suspect that you added Allegra (fexofenadine) because the hives are already getting worse. It takes about a hour before most oral drugs can get into your system. ...Read more

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I have had post-nasal drip for two years now and I have tried everything, flonase, claritin, (loratadine) zyrtec, cingulair. Nothing seems to work. What should I d?

I have had post-nasal drip for two years now and I have tried everything, flonase, claritin, (loratadine) zyrtec, cingulair. Nothing seems to work. What should I d?

See physician: Different potential causes for long-standing post nasal drip are numerous and several potential interventions exist that you have not tried. Discuss with a physician who can examine you (preferably an allergist or ent) to begin the pathway towards finding relief. ...Read more

Dr. John Chiu
551 Doctors shared insights

Zyrtec (Definition)

Zyrtec is a non-sedating antihistamine which is a kind of antihistamine type drug (common ...Read more