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Doctor insights on: How Long Does An Allergy Pill Stay In Your Body

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How long does an allergy pill stay in your body?

How long does an allergy pill stay in your body?

Depends: Multiple factors influence the duration of a medication in the body. Firstly, some medications are "short-acting" while others are "long-acting". Then, different bodies process medications faster than others. Finally, conditions which can affect removal (e.g. Kidney diseases) can cause a delay in elimination of the medication and therefore lingering effects. Typically 4-6h, 12h or 24h. ...Read more

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Dr. John Chiu
2,568 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 long does symptoms last from allergy pill?

How long does symptoms last from allergy pill?

Varies: If you are asking about side effects from allergy medicine (?Drowsiness), it can vary according to the medicine you took, the dose and how your body handles it. Since many allergy medicines are taken once a day, it could take a day or so for the effects to wear off. ...Read more

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How long before allergy pills leave your system?

How long before allergy pills leave your system?

It Depends: It depends on which medicine you have taken. Some are gone in 12 hours while there are a few that can actually last for up to a week. ...Read more

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How long should it take for an allergy pill to work?

How long should it take for an allergy pill to work?

1/2 to 1 hour: Some antihistamines require metabolism in the liver to be converted into the most effective form to block histamine. These antihistamines take at least 1 hour to become effective. However, some antihistamines like allegra, xyzal (levocetirizine) and Clarinex are already in the active form and begin to work as soon as they are absorbed which take about 30 minutes. ...Read more

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I took a allergy pill zyrtek but it doesn't seem to be working. How long can do I have to wait to take some bendryl?

I took a allergy pill zyrtek but it doesn't seem to be working. How long can do I have to wait to take some bendryl?

Symptoms: You did not describe any symptoms or what you are experiencing and what you expect. It is best on health tap to be specific and direct. ...Read more

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I took an allergy pill and i think i am having a allergic reaction and i was wondering how long it will last. The reason why i think that is i got the?

I took an allergy pill and i think i am having a allergic reaction and i was wondering how long it will last. The reason why i think that is i got the?

Please re-submit: Hard to know if the reaction is to the allergy pill or something else and the remainder of the question is cut-off. Thanks for using HealthTap! ...Read more

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How long does it take a 25mg Benadryl (diphenhydramine) pill to start working on allergy?

How long does it take a 25mg Benadryl (diphenhydramine) pill to start working on allergy?

Should: Start working within the hour. But it is a low dose and sedating. You might try an Allegra or Claritin (loratadine) ( store brand ok) that is once a day and once in your system you won't be on a roller coaster of it working or not as long as you take it regularly. ...Read more

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My husband has been braking out every morning with these red itchy spots on his body, he takes an allergy pill and they goaway the next tday thr back?

My husband has been braking out every morning with these red itchy spots on his body, he takes an allergy pill and they goaway the next tday thr back?

Detergent?: Possibly a detergent you are using to wash your sheets/pillowcases, etc. Could be the sheets themselves or a fiber used in the sheets. Do you have pets (vcats/dogs) that may climb on the bed when you're not there? All are possibhilities. You may want to have your husband checked by an allergist after you remove these possibilities as causes. ...Read more

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How long should you wait to drink alcohol after taking allergy pills?

How long should you wait to drink alcohol after taking allergy pills?

Never: Most over-the counter allergy pills can cause some amount of sedation. Even "non-sedating antihistamines " such as Claritin (loratadine) or Allegra make some people drowsy. Since both alcohol and antihistamines can impair mental funtioning and reactions times, it is never advisable to mix these medications. ...Read more

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How long after taking 1 Equate Allergy Relief pill can I drink a beer?

How long after taking 1 Equate Allergy Relief pill can I drink a beer?

Whenever: there are no contraindications to alcohol in using Zyrtec (cetirizine) (certrizine) which is a non-sedating antihistamine. Especially if you are truly talking about ONE beer. I always worry, thought, about people who need to know when they can drink something after drug X, or surgery Y. When people are that focussed on drinking, I think it may be an indicator of an underlying problem. Think about it. ...Read more

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Please tell me how long do I take medicine for a sinus infection and can I take it along with 24 hour allergy pill?

Please tell me how long do I take medicine for a sinus infection and can I take it along with 24 hour allergy pill?

If you have actual: Sinus infection then you would usually be prescribed antibiotics and would take the complete course of medication. ...Read more

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Penicillin allergy, after 8 pills: got hives, especially fastidious on the gluteus (3 days). I started Benadryl (diphenhydramine) yesterday. How long will hives last?

Penicillin allergy, after 8 pills: got hives, especially fastidious on the gluteus (3 days). I started Benadryl (diphenhydramine) yesterday. How long will hives last?

Hard to say: Take the Benadryl (diphenhydramine) regularly as your dr. Prescribed...It could take several days to go away....But as long as there is no significant swelling(unlikely to occur now..I presume you stopped the penicillin) there should be nothing to worry about.... ...Read more

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If i was.Allergic to a pill how long after taking it would i know i took norco (hydrocodone and acetaminophen) but i've took vicidion and lortab before what's the chance of allergy?

If i was.Allergic to a pill how long after taking it would i know i took norco (hydrocodone and acetaminophen) but i've took vicidion and lortab before what's the chance of allergy?

Minutes to hours: If you are allergic to a drug, the reaction usually occurs within minutes and 2 hours. However if the reaction is a rash , it may take several days. Norco (hydrocodone and acetaminophen) is not a highly allergenic drug although you may get side effects from the opiate it contains. ...Read more

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Itchy(under arms) 3weeks, how long does arithromycin reaction take to go away? Tried allergy pills, creams(hydrocortisone, zinc oxide creams).What now?

Itchy(under arms) 3weeks, how long does arithromycin reaction take to go away? Tried allergy pills, creams(hydrocortisone, zinc oxide creams).What now?

Question unclear: Erythromycin or azithromycin? Either one should be out of system by 3 weeks. Itching may be due to deodorant/antiperspirant irritation after shaving. Try change in deodorant/antiperspirant (one without aluminum). If still not resolved, see dermatologist. ...Read more

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How long will claratin last in the body to help with allergies?

How long will claratin last in the body to help with allergies?

24 hours or less: Claritin, and its generic form - Loratadine - generally lasts about 17 hours. Thus, taking it in the morning (which is safe to do as it is non-drowsy) should get you through the majority of the day. If it does not, talk to your doctor about adding a topical nasal steroid spray. ...Read more

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If i tough out my allergies to my dog for long enough will my body eventually get used to it (like with allergy shots)?

If i tough out my allergies to my dog for long enough will my body eventually get used to it (like with allergy shots)?

Allergy shots: Do help. But. , first get evaluated and discuss this with your allergist to find out if you are truly allergic to dogs. You could have other issues and be sensitive to other stuff, too. ...Read more

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Up to how long can a body reactic to a food allergy? Immediately upon contact or can there be a reaction as the food contiues to digest?

Up to how long can a body reactic to a food allergy? Immediately upon contact or can there be a reaction as the food contiues to digest?

Varies: Type-i, ige-mediate, food-induced reactions can occur within seconds of an exposure. Type-iv or cell-mediated food reactions, although usually less clinically severe , can persist for over 24 hours. ...Read more

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How long does Benadryl (diphenhydramine) allergy stay in the body?

How long does Benadryl (diphenhydramine) allergy stay in the body?

A long time: The half life is 8 hours. Assuming that after 4 half lives it is eassentially gone it would take upwards of 32 hours to be eliminated. ...Read more

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Sir i am 21 and have dyspnea from 1 month and 20 days and doctor say i have allergy sir can you tell me how long allergy can live in my body?

Sir i am 21 and have dyspnea from 1 month and 20 days and doctor say i have allergy sir can you tell me how long  allergy can live in my body?

Allergy?: Allergy alone doesn't fully explain your symptoms. Perhaps your doctor is saying you have asthma (which is often triggered by allergy). This is important because asthma (and allergy) are both very treatable conditions. Chest xray and breathing tests (spirometry) can make this diagnosis and rule out other causes like pneumonia. ...Read more