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Doctor insights on: How Long Does It Take For An Allergy Medicine To Work

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How long does it take it for allergy medicine to take effect?

How long does it take it for allergy medicine to take effect?

30-60min: Oral antihistamines take anywhere between 30 to 60 minutes to start working. Steroid nasal sprays may take up to 2 weeks, antihistamine nasal sprays take 20 minutes, and other medications can take longer. If your symptoms are bad, you may not notice a significant effect right away from the medications. ...Read more

Dr. John Chiu
2,638 Doctors shared insights

Allergies (Definition)

Allergies occur when your immune system is triggered by envirionmental factors it should ignore--for example, pollen in the air, or dander on a cat or dog--and creates cells to fight against them. An allergic reaction typically causes itching, congestion, or drainage, and ...Read more


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How much time should it take for my new allergy medicine to work?

It depends: You don't tell me what your allergic symptoms are nor what medicine you were prescribed. In principle, antihistamines, oral and topical (nasal and ocular) work within 1-2 hours and 15-45 minutes, respectively. Inhaled and oral corticosteroids (cortisone-like) take at least 6 hours to start working, full effect after a few days. ...Read more

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How long before allergy medicine works?

How long before allergy medicine works?

Varies: Depending upon the medication used, the time until the onset of effect will vary. Generally antihitamines work relatively quickly and inhaled steroids may take a week or so to have ful effect. ...Read more

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Can I take cough syrup along work allergy medicine?

Can I take cough syrup along work allergy medicine?

Cough: Generally you can but look to make sure they don't have any of the same ingredients. Depending on the cough syrup and the antihistamine type, they could make you hyper or tired. You can check it on line as well to look for interactions ...Read more

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Is it possible to have taken an allergy medicine that works?

Is it possible to have taken an allergy medicine that works?

Confusing question.: I would guess that you are asking whether it is possible to find an allergy medication that works. If so, the answer is yes. However in order to get a better answer, you will have to be more specific on the type of allergic problem you have and what medications you have tried thus far without having any success. ...Read more

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What is considered the most effective allergy medicine to take?

What is considered the most effective allergy medicine to take?

Depends: The most frequently used and most available without a prescription are antihistamines. The new generation ones (zyrtec, claritin, allegra, xyzal, (levocetirizine) clarinex) are safe and effective. The most effective treatments for allergic rhinitis are nasal steroid sprays. The strongest allergy medication would likely be considered oral steroids like prednisone, but the significant side effects limit is use. ...Read more

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Are there any allergy medicine that works against pet allergies?

Are there any allergy medicine that works against pet allergies?

Although: Antihistamines help - if you have frequent contact with pets that you appear to be allergic to - please see an allergist. ...Read more

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Should I take my allergy medicine before I go out and pull weeds?

Should I take my allergy medicine before I go out and pull weeds?

Yes: If a person takes an antihistamine such as allegra, claritin, zyrtec, etc, at least 1 hours before exposure, this can decrease the intensity of the allergy symptoms. The more effective nasal sprays work best when taken regularly. ...Read more

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What is considered the most effective allergy medicine that works?

What is considered the most effective allergy medicine that works?

Many: The most effective allergy treatment for allergic rhinitis is the prescription nasal steroid sprays (qnasl, flonase, nasonex, (mometasone) etc) over the counter antihistamines can be very effective including claritin, zyrtec, and allegra. Some people will respond better to one over the other (for unclear reasons). The best long term therapy for significant environmental allergies is allergy injections. ...Read more

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What is good allergy medicine that works against pet allergies, what do you recommend?

What is good allergy medicine that works against pet allergies, what do you recommend?

Allergy shots/remove: All allergy medications will help with pet allergy, but not eliminate them. It also depends on what pet. Cat allergen is so potent that no medication is going to be truly effective. With dogs, removal from the bedroom, washing hands before going to bed and having "bedroom only clothes" may help significantly. Long term solution is desensitization (allergy shots) by a board-certified allergist. ...Read more

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What is the best long term chronic allergy medicine to use if I am allergic to my dog?

What is the best long term chronic allergy medicine to use if I am allergic to my dog?

OTC antihistamines: The best treatment is to be dog free. However, otc antihistamines and prescription nasal sprays can be helpful. ...Read more

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What would be a highly effective long term allergy medicine to use if I am allergic to my dog?

What would be a highly effective long term allergy medicine to use if I am allergic to my dog?

Dog allergy: The treatment of pet dander allergy includes: 1. Avoidance--keep dog out of bedroom and preferably out of house; wash dog at least weekly, use hepa air cleaners in house.
2. Medication: daily use of an antihistamine (zyrtec, claritin, allegra, clarinex, xyzal) may decrease some symptoms. Topical nasal steroids are most effective (qnasl, flonase, etc).
3. Allergy injections: best longterm option. ...Read more

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I love cats and really want to adopt one but I'm allergic. Is there a good allergy medicine I can take so I can get one?

I love cats and really want to adopt one but I'm allergic. Is there a good allergy medicine I can take so I can get one?

Allergy shots: Allergy medications will not take you a long way if you want to live with a cat. I suggest you see an allergist, get tested then get allergy shots for cats before you get one. ...Read more

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What allergy medicine can I take while nursing?

What allergy medicine can I take while nursing?

Loritadine/fexofenad: The long acting loritadine (claritin) and fexofenadine (Allegra) are both well tolerated during beast feeding and have minimal effect on milk production. Their molecular nature makes crossover inn BM minimal. ...Read more

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Might I take allergy medicine (allegra) while I'm sick?

Might I take allergy medicine (allegra) while I'm sick?

Probably: I depends on what type of illness it is. Most of the time antihistamines such as Allegra (fexofenadine) are safe. Best to ask your doctor if it is appropriate in your situation. ...Read more

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Can I take canesten oral while taking reaction allergy medicine?

Can I take canesten oral while taking reaction allergy medicine?

No: Not if you are taking allergy medicine for canesten oral ingredients, nor take it if you are taking astemezole, or have terfenadine laying around since it has been off market for couple of years now (also known as seldane). ...Read more

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Please tell me, could I take nyquil and allergy medicine together?

Please tell me, could I take nyquil and allergy medicine together?

Antihistamine: Nyquil has Diphenhydramine in it, I believe, which is Benadryl (diphenhydramine) which is an allergy medicine and causes somnolence. The dose is not high enough and long acting to preclude the use of the daytime, non-drowsy allergy medicine to help you during the day. ...Read more

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Are there any long term effects from taking OTC allergy medicine on a regular basis?

Are there any long term effects from taking OTC allergy medicine on a regular basis?

No but why: Rather than commit to taking medications regularly, see an allergist to identify why you need to take medications long term. Avoidance measures can be useful if the trigger is known. Nasal steroid sprays are more effective than antihistamines and allergy injections can control symptoms long term even after the injections are discontinued and allow less medication use. ...Read more

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Is there a side-effect in taking anti-allergy medicine for a long time, like 6 months?

Is there a side-effect in taking anti-allergy medicine for a long time, like 6 months?

Generally not: Many people take allergy mede for yrs and yrs. It only treats te symptoms and does nothing to address underlying causes of allergies. Nutrition is important. Supporting immune system is important. Allergy shots or sublingual drop therapy would be a better long term solution. ...Read more

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Can you take allergy medicine with hydrocodone?

Can you take allergy medicine with hydrocodone?

Maybe: I agree with dr. Juster; use caution when mixing narcotics with allergy meds. But, you need to know that hydrocodone is a natural stimulant leading to mast cells releasing histamine and causing itch. Not a true allergy, rather a side effect from the drug. Anti-itch medications can help but they can also worsen drowsiness. Maybe switching to something else would be best. ...Read more

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Is alavert allergy medicine okay to take with alcohol?

Is alavert allergy medicine okay to take with alcohol?

Alavert: Alavert is a antihistamine known also as loratadine. I do not advocate the consumption of alcholol with medication yet no reported serious interactions. ...Read more

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When should I take allergy medicine allegra (fexofenadine)?

When should I take allergy medicine allegra (fexofenadine)?

Without food: Fexofenadine (allegra) comes in 2 doses for adults, 60 mg. And 180 mg. The 60 mg dose is taken twice a day, every 12 hr. The 180 mg dose is taken once a day, usually in the morning and it is more effective than 60 mg, 2x/day. Fexofenadine should always be taken 1 hr. Before food because food, especially fatty food, interferes with fexofenadine absorption. ...Read more

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Can I take allergy medicine while breastfeeding? Thanks in advance.

Can I take allergy medicine while breastfeeding? Thanks in advance.

Yes: It is best to check with your child's doctor and your doctor as to what is most appropriate for your situation. ...Read more

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Is it safe to take allergy medicine while breastfeeding?

Is it safe to take allergy medicine while breastfeeding?

Not recommended: These medications are not recommended while breastfeeding as they can significantly decrease your breast milk supply. I would suggest nasal rinses and avoidance of allergens whenever possible. ...Read more

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Would I really need to wait 12 hours to take Claritin (loratadine) 12 hour allergy medicine?

Would I really need to wait 12 hours to take Claritin (loratadine) 12 hour allergy medicine?

Yes: Unless it has a decongestant, it is generally considered safe to take even up to 10 mg of Claritin (loratadine) 4 x a day if needed even though this is 4x the dose approved. But we do use as much as 4x the dose for those who have hives. ...Read more

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Could you really need to wait 12 hours to take Claritin (loratadine) 12 hour allergy medicine?

Could you really need to wait 12 hours to take Claritin (loratadine) 12 hour allergy medicine?

Not really: The Claritin (loratadine) reditab 5 mg will last about 12 hours, but there is no harm to taking one sooner or just go for the 10 mg reditab for 24 hour relief. ...Read more