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Doctor insights on: Allegra Overdose

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What should I do if I accidentally take too much allegra (fexofenadine)?

What should I do if I accidentally take too much allegra (fexofenadine)?

Stop taking it.: The half life of Allegra (fexofenadine) is 14.5 hours in normal individuals. It is metabolized mainly through the liver and GI tract so if you have liver disease it may be metabolized slower. This means that in a normal individual about half of the medication is left after 14.5 hours. ...Read more

Dr. M. Hytham Beck
360 Doctors shared insights

Fexofenadine (Definition)

Fexofenadine is an antihistamine which is used to treat allergies such as hayfever, and hives. It can be taken once or twice a day. It is a second generation antihistamine and does not cause as much drowsiness as other antihistamines such as Diphenhydramine (benaryl) or chlorpheniramine. Always be careful about drowsiness with any antihistamine especially if driving ...Read more


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What if I accidentally take two allegra (fexofenadine) d tablets within 24 hours?

What if I accidentally take two allegra (fexofenadine) d tablets within 24 hours?

Watch: If you took 2 of 180mg tab, please have someone watch for you the following signs: headache, vomiting, dizziness (2%), fever, pain, drowsiness etc, and contact your md immediately. ...Read more

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I typically take an allegra (fexofenadine) 180 in the am and an alavert 10mg at night. Today I accidentally took 1 allegra (fexofenadine) 180 @7am and another at 10pm. Will I be ok?

I typically take an allegra (fexofenadine) 180 in the am and an alavert 10mg at night. Today I accidentally took 1 allegra (fexofenadine) 180 @7am and another at 10pm. Will I be ok?

Yes: Allegra (fexofenadine) is a very safe new generation antihistamine that does not cross the blood-brain barrier, so even more than the recommended dose will not lead to drowsiness or impaired reaction time. However, higher than normal doses of alavert (loratadine) could potentially lead to mild drowsiness. ...Read more

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What happens if I take too much allegra (fexofenadine)?

What happens if I take too much allegra (fexofenadine)?

Nothing: You may either become sedated or it could make you jittery. Overall the otc allergy medications are very safe and you would have to take many to have any significant side effects. ...Read more

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Can you take too much allegra (fexofenadine)? What would the symptoms be?

Can you take too much allegra (fexofenadine)? What would the symptoms be?

Yes: Any medication can cause problems if taken in excess. Though I am not familiar with specific symptoms regarding Allegra (fexofenadine) overdose, most of the time, patients will have vomiting, abdominal pain, or headaches. I would imagine that liver problems might occur with too much Allegra (fexofenadine) as it is a medication that is broken down by the liver. Bottom line: don't do it. ...Read more

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How much allegra (fexofenadine) can I take?

Allegra (fexofenadine): Hello. The normal dose for Allegra (fexofenadine) is 180 mg per day for an adult. Check with your pharmacist for other options if you feel this medication at that dose isn't helpful. There are other otc meds you could try. ...Read more

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Can I take allegra 120 twice a day.

Most likely: But this would make side effects more likely - dry mouth and eyes for example, perhaps sedation / tiredness. Might think of mixing medicines from different classes if bad allergies are the issue. A primary care provider can help in this regard. ...Read more

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Can I take allegra (fexofenadine) with singular?

Can I take allegra (fexofenadine) with singular?

Absolutely: Their mechanisms of action are totally different and even somewhat complementary. ...Read more

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I accidentally took 2 Allegra (fexofenadine) 180mg?

No major problem: If this is a plain antihistamine with no decongestant in it, I would expect no serious problem although some minor drowsiness may occur. As, long as you're experiencing no discomfort simply let the medication dissipate. If you have any further concerns, call your physician. ...Read more

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Can I take allegra (fexofenadine) if im on loratabs?

Can I take allegra (fexofenadine) if im on loratabs?

Loratadine / lorabid: The first is an antihistamine, the second an antibiotic. In either case it should be ok, but would speak to your doctor to clarify so that you are not taking double meds when not necessary, as Allegra (fexofenadine) is also an antihistamine. ...Read more

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How long does it take for allegra's effects to begin?

Pretty Quickly: Allegra (fexofenadine) and most otc antihistamines has its effect within the first 30 -60 minutes. ...Read more

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Can I take allegra (fexofenadine) and claritanl together?

Can I take allegra (fexofenadine) and claritanl together?

Yes, but why: Both Allegra and Claritin (loratadine) are new generation antihistamines used to treat allergies. If symptoms are so severe that both medications are needed, see an allergist for a better treatment plan. However, there is no drug interaction if both are taken together at usual doses. ...Read more

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Can I take anything else on top or allegra (fexofenadine)?

Can I take anything else on top or allegra (fexofenadine)?

Zyrtec (cetirizine): If you mean "on top" of allegra, (fexofenadine) or in addition to Allegra (fexofenadine) to reduce itching I would recommend zyrtec. Allegra (fexofenadine) in the am and zyrtec at night. Zyrtec may cause drowsiness so be careful. ...Read more

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What if I take two allegra (fexofenadine) d, is this safe?

Double dosing: Many over-the counter medications are provided at 1/2 the prescription dose. For example, otc Pepcid (famotidine) is 20mg, whereas the prescribed dose is usually 40 mg. This general principle does not apply to all medications and Allegra-D is a good example. Double dosing the pseudofed in this medication could be dangerous. Always ask the pharmacist about safety before double dosing any otc medications. ...Read more

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What if I accidentally took 4 allegra (fexofenadine) pills?

Probably not much: If they were 30 or 60 mg then probably not much. Not sure about 180 mg. Suggest contacting poison control center in your area. The more important question is why you took four. Not to assume anything but if it were intentional in an attempt to harm yourself then seek someone's help now. ...Read more

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Are there people who should not take allegra (fexofenadine)?

Are there people who should not take allegra (fexofenadine)?

Some: Pku patients: Allegra (fexofenadine) odt contains phenylalanine, other Allegra (fexofenadine) formulations are ok.
Pregnancy: it's category c, so pregnant women should avoid and use category b
kidney failure: since Allegra (fexofenadine) is excreted by kidneys, a lower dose is used
previous adverse reaction to allegra (fexofenadine). ...Read more

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How many days does it take for allegra (fexofenadine) to work?

How many days does it take for allegra (fexofenadine) to work?

Hours: Allegra (fexofenadine) and most oral antihistamines will start to work within an hour or so. It does not take days for these medications to work. ...Read more

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How long does allegra (fexofenadine) medication take to expire?

How long does allegra (fexofenadine) medication take to expire?

Read the label: There is considerable debate about the accuracy of label expiration dates. However, as a general rule, it is best to adhere to what the label states is the expiration date. This is especially true of liquid medication. ...Read more

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How long does it take allegra (fexofenadine) to leave your system?

Antihistamines: The antihistamines Allegra (fexofenadine), Claritin (loratadine), and zyrtec (cetirizine) can last in your body for more than a week. Most allergists want these medications discontined for a week before they perform skin testing. Some persons are 'slow-metabolizers' and these drugs can be in your system much longer. ...Read more

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Can I take more then 1 allegra (fexofenadine) a day? One isn't enough.

Can I take more then 1 allegra (fexofenadine) a day? One isn't enough.

Depends: If it is the Allegra (fexofenadine) 12 hr formula, you take it twice daily and the 24 hr formula once a day, just as it says on the package. If you feel you need more rx, then you should see your primary doctor, an allergist, or an otolaryngologist for more direction on how to treat your allergies. There are many more medication options plus allergy testing and immunotherapy can be offered. ...Read more

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I accidently took two allegra (fexofenadine) today, one this am, one just now. Should I be worried?

Be happy: You did not mention what strength of Allegra (fexofenadine) you took, but I assume you are worried because you took 2 tablets of 180mg each. We use this dose quite often for patients with severe rashes or hives. Also, during the clinical studies prior to the release of allegra, (fexofenadine) doses of up to 540mg were used without ill effects. ...Read more

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Is it ok to take allegra (fexofenadine) d everyday instead of only the 15 days stated on the package?

Ask your Doctor: If you do not have high blood pressure, heart, or prostate issues, then it is probably ok. But, you should discuss this w/your dr to be sure it will be ok for you, as well as see why you are needing it--may find alternate solution. ...Read more

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My question is should I go back to allegra (fexofenadine)-d or take the regular allegra (fexofenadine)?

Allegra (fexofenadine) alone: Allegra d contains a decongestant that is a poor long term option. If you are dealing with chronic nasal congestion I would recommend alternative treatment such as a nasal spray like nasonex, (mometasone) flonase, etc. These are more effective long term options for nasal congestion due to allergies or other triggers. ...Read more

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How long does it take for allegra (fexofenadine) 24hr to start working? Does not include pseudophedrine.

A day or so: Once you start taking allegra, (fexofenadine) it may work within a day for allergic symptoms. If it is not working for you, you may need to try another ant-allergic agent. ...Read more

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I got prescribed mecklizine, what exactly does it do? And can I take it with my daily Allegra (fexofenadine)?

Meclizine: Meclizine is an antihistamine that reduces the effects of natural chemical histamine in the body. Meclizine is used to treat or preventnausea, vomiting, and dizziness caused by motion sickness. It is also used to treat symptoms of vertigo (dizziness or spinning sensation) caused by disease that affects your inner ear. Next time ask your doctor what you are being prescribed before taking it. ...Read more

Dr. Michael Finkelstein
382 Doctors shared insights

Allegra (Definition)

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