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Doctor insights on: Allergy Tablets

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What is allergy tablets do?

What is allergy tablets do?

Allergy tablets: Most allergy tablets are medications that fall into the category of antihistamines that block the effect of histamine. This treats symptoms such as sneezing, itching, runny nose, etc. Sometimes antihistamines are combined with decongestants to help with stuffy nose. Studies are evaluating "allergy tablets" that may work similar to allergy shots where the tablet contains the pollen, etc. ...Read more

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Dr. John Chiu
2,491 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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What's the best time of day to take my allergy tablets?

What's the best time of day to take my allergy tablets?

Allergy meds: If your tablet is Allegra and it's non-sedating, you can take it anytime. Ideally, you'd like to take it 30-60 minutes before your allergy exposure, if there's a specific thing you react to. If you take benadryl, (diphenhydramine) best take it at night if it sedates you. If you take sudafed for congestion, avoid taking it at night because it causes insomnia. Prescription sprays, any time you want. Singular --night. ...Read more

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What to do if i took 5 allergy tablets the dosage is 1 will i be okay?

What to do if i took 5 allergy tablets the dosage is 1 will i be okay?

Ok but...: As antihistamines have a high safety margin, you may just end up with dry mouth and perhaps drowsiness if you take 5 times the dose in one gulp. The question is why did you take so many at one time? The answer would be different when a decongestant is also present since such a high dose of decongestant can raise your blood pressure and heart rate significantly and potentially causing a stroke. ...Read more

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Why do some OTC allergy tablets work for some people but not for others? Which OTC allergy med works best in most people?

Why do some OTC allergy tablets work for some people but not for others?  Which OTC allergy med works best in most people?

Good question!: It is not clear why some persons respond more favorably to some antihistamines and not others. There are theories, but still not completely known. In my experience zyrtec (cetirizine) works very well for most people. Also, the approved doses of antihistamines were determined based on the minimal effective dose for the majority of people. Some persons may just need a higher dose! ...Read more

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Is it safe to take allergy tablets and pain killesr together?

Is it safe to take allergy tablets and pain killesr together?

Eat?: Yes you can take them together. I would use a nonsedating allergy medication (claritin, zyrtec) to minimize sedation issues with the combination. ...Read more

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What is allergy tablets do to stop my rash?

What is allergy tablets do to stop my rash?

Depends: There are different types of allergy tablets. Antihistamines (claritin, zyrtec, allegra) block the effects of histamine so they can decrease itching and redness. The tab singulair (montelukast) is a leukotriene receptor blocker which blocks the effects of leukotrienes--this can also decrease itching and redness. Oral steroid tablets are very potent and have side effects-they decrease inflammation. ...Read more

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What do allergy tablets do to stop my rashes?

What do allergy tablets do to stop my rashes?

Decrease inflammatio: Allergy tablets, I am guessing, are referring to antihistamines such as zyrtec (cetirizine), Claritin (loratadine), or Allegra (fexofenadine) act by blocking histamine receptors, which are responsible for the inflammation, swelling, itching, and erythema associated with allergic rashes. ...Read more

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Is it okay to take allergy tablets while pregnant ?

Is it okay to take allergy tablets while pregnant ?

Only Some: All drugs are rated on a pregnancy safety category from A-D and X. Pretty much all drugs that are A or B are ok while pregnant. Zyrtec and Claratin and Xyzal (levocetirizine) are all category B. The others are not and so should be avoided. ...Read more