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Doctor insights on: What Is The Average Time Needed For An Antihistamine To Begin To Work

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What is the average time needed for an antihistamine to begin to work?

What is the average time needed for an antihistamine to begin to work?

45-90 minutes: Antihistamines taken by mouth begin to work in about an hour but may take longer if you've just eaten. Antihistamine nasal sprays (astepro, patanase) begin to work in 30 minutes. An antihistamine injection, usually diphenhydramine, sometimes given for a severe allergic reaction or anaphylaxis begins to work in a few minutes. ...Read more

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Dr. Paul Carter
644 doctors shared insights

Antihistamine (Definition)

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


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When is the best time to take an antihistamines for an allergy? Why?

When is the best time to take an antihistamines for an allergy? Why?

It depends: It depends on the antihistamine and when you are exposed to the cause for your allergies. Antihistamine pills generally take at least 30 minutes to two hours to take effect and peak hours later. Pollen levels are highest in the morning, but if you are exposed to other allergens such as animal dander or dust, those levels would affect you at night. Take it a few hours before your worst time. ...Read more

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What is the best time to take an antihistamine?

What is the best time to take an antihistamine?

Any time: You can take antihistamines any time of the day.Take them same time of day everyday. ...Read more

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Why is it necessary to dilate the eyes to get an accurate prescription for a child?

Why is it necessary to dilate the eyes to get an accurate prescription for a child?

Control: Children have very strong eye muscles for reading. When attempting to prescribe glasses, the examiner must control this muscle. To do so, we use dilating drops called cycloplegics to inactivate these muscles temporarily. The result is a more accurate examination. ...Read more

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Ggenerally, how long can one expect ultherapy to last before needing a retreatment? There will be an additional charge to the initial visit fee?

Ggenerally, how long can one expect ultherapy to last before needing a retreatment? There will be an additional charge to the initial visit fee?

Depends on provider!: Each practitioner and clinic/medispa that provide ultherapy has their own price policy and each patient will have unique results. Changes in tissue are lasting, but this too is variable with each patient. Ask your provider! ...Read more

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For how long does one need to be off a certain food in order to determine if one is intolerant to it?

For how long does one need to be off a certain food in order to determine if one is intolerant to it?

About 3 weeks: Standard practice is to eliminate possible food allergens for 3 weeks to give the immune system time to calm down. You may be able to notice improvements in a shorter time but going a full 3 weeks will give a better response if you try to reintroduce the food. ...Read more

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What is the best probiotic for crohn disease ? And how many is required a day for it to work?

What is the best probiotic for crohn disease ? And how many is required a day for it to work?

No one knows!: This is a good question that it impossible to answer at this time; not nearly enough research has been done. Some studies have found benefits of lactobacilli ; bifidobacteria but there are many different strains ; no one has compared different brands. Research suggests sacchromyces boulardii does not help unless you are on antibiotics. See http://www.Bastyrcenter.Org/content/view/1268/ ; comment:. ...Read more

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It is recommended that if you want to have a baby, it is better to have two and the preferable age difference is 20 -30 months. Is there the series of methods to create a happy and successful life for our only child?

It is recommended that if you want to have a baby, it is better to have two and the preferable age difference is 20 -30 months. Is there the series of methods to create a happy and successful life for our only child?

Under a dozen: I am sure many old children might argue that they turned out pretty good so it isnt the same for everyone. Having 5 children of my own i see how they had to learn to life together, help each other, be patient with the ones who required that and learned to serve in a family. That was pretty great too. Each person has to decide that issue for themselves. You can wait and see if you still want anothe. ...Read more

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When is the best time to make a baby? and how long would it take for the egg and sperm cell to mature?

When is the best time to make a baby?
and how long would it take for the egg and sperm cell to mature?

After settling down: After the wedding, find a nice happy home to settle down in. Make it a good place to feel safe and secure, to live a low-stress life. Figure out the menstrual cycle and when ovulation is. Then, don't think too much about babies or pregnancies. Just start to have sex twice a day from 4 days before the estimated ovulation day through the day after. Those should be the best days. ...Read more

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Is it possible for you to take loratadine and phenylephrine at the same time?

Yes: The two medications do not conflict with each other and may be used at the same time. ...Read more

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Is it possible to aquire an order for blood tests like the elisa that allow me to go to facilitys of my choosing, and is it possible to get an order like that which does not expire after using?

Is it possible to aquire an order for blood tests like the elisa that allow me to go to facilitys  of my choosing, and is it possible to get an order like that which does not expire after using?

It depends.: Are you asking if we can give you this order? Then the answer is no, not here on this forum. However, you don't need an order to be tested for HIV. Go to your local health department and you can be checked for it at minimal to no cost. IF you are worried you have HIV, then get checked for other sexually transmitted diseases and for hepatitis B and possibly C as well, while you are at it. ...Read more

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What is the best time of the day to take a baby aspirin for heart therapy purposes?

What is the best time of the day to take a baby aspirin for heart therapy purposes?

Any time.: Aspirin's antiplatelet effect lasts for approximately 8 days; therefore, it does not matter what time of day one takes a daily dose. ...Read more

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What is the most appropriate herb to use for a man to build up sperm count?

What is the most appropriate herb to use for a man to build up sperm count?

None: Stay healthy, eat right, exercise, stay lean, don't take medications or drugs, stay away from tobacco and alcohol, avoid radiation or heavy metal toxins, have good genetics. Sperm count can vary a lot depending upon who is doing the counting. By the way, there are no herbs that will increase sperm count, but many that can lower it. Avoid them and save your money and your sperm. ...Read more

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What would be the safest benzo for situational anxiety or stress from work to help sleep and what would the dosage normally start out at ?

What would be the safest benzo for situational anxiety or stress from work to help sleep and what would the dosage normally start out at
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Not at first: I wouldn't recommend a benzo before exploring what the problem is, and why sleep is disturbed. Supportive or other talk therapy might be started, with melatonin or perhaps an herbal relaxant to help sleep to begin with. If using a benzo, Lorazepam is safe if used as prescribed -- perhaps .5mg twice daily, and titrated as needed. If sleep is the primary need, it wouldn't be my 1st choice. ...Read more