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Doctor insights on: I Accidently Took 2 Allegra 24 Hour

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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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I took the wrong allegra (fexofenadine) for my symptoms 16 hours ago (allegra (fexofenadine) (fexofenadine) 24 hour). Now I want to take allegra (fexofenadine) d 12 hour. Is it safe to take allegra (fexofenadine) d now?

I took the wrong allegra (fexofenadine) for my symptoms 16 hours ago (allegra (fexofenadine) (fexofenadine) 24 hour). Now I want to take allegra (fexofenadine) d 12 hour. Is it safe to take allegra (fexofenadine) d now?

It is ok: Allegra (fexofenadine) 24 hours is a slow release non drowsy anthistamine. Allegra (fexofenadine) d 12 hours has a decongestant, sudafed or pseudo ephedrine. D stands for decongestant. Allegra (fexofenadine) itself is pretty safe even if the dose is doubled. However, avoid exceeding the dose of decongestant as it can make you hyper and also keep you awake at night.

You may also see an allergist to treat the cause of the problem. ...Read more

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Can I take more than one Allegra (fexofenadine) 180 24 hour tablet per day? For how long can I take this?

Yes: You can for a day or two, depending on why you need it for, if longer you need a doctor to look at you, you might need additional/different medicine, an allergist can help, check aaaai. Org or acaai. Org for an allergist in your area, good luck, ...Read more

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Can I take Claritin (loratadine) 24 hour with allegra 24 hour? I took the Claritin (loratadine) cause that's all I had but my husband bought allegra which I prefer.

Can I take Claritin (loratadine) 24 hour with allegra 24 hour? I took the Claritin (loratadine) cause that's all I had but my husband bought allegra which I prefer.

Not if "D" formula: Often the number 24 refers to the "d" formulas. Claritin (loratadine) d24 and Allegra d 24 each contain 240 mg of pseudoephedrine, equivalent to 8 small red tablets of sudafed. You definitely wouldn't want to take 2 of the decongestant type of these medications in one day. On the other hand, taking one plain Claritin (loratadine) 10 mg and one plain Allegra 180 mg on the same day would be fine. Much more was used in tests. ...Read more

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Can my 11 year old take 24 hour allegra (fexofenadine)?

Can my 11 year old take 24 hour allegra (fexofenadine)?

Maybe: The drug is listed for kids 12 and above. If the kid is above average in size I might, but the manufacturer suggests the 30 mg twice daily at that age. ...Read more

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What if I give my 10 year old 24 hour allegra (fexofenadine)?

12 years: Usually 12 years of age is the age when we switch to adult dosages. If the child is smaller than most, then wait until older. Ten might be ok if you have an adult sized child. ...Read more

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When is the best time of the day to take allegra-d 24-hour?

Am: As you might have trouble sleeping, caution though if you have hypertension or glaucoma, read the warnings, see your doctor if it doesn't work ...Read more

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Can I take allegra (fexofenadine) d 24 hour with nyquil cold flu?

Can I take allegra (fexofenadine) d 24 hour with nyquil cold flu?

Avoid both: There is a small but real risk of respiratory depression (quitting breathing), or cardiac arrthymia due to a delay in the electrical signal that tells the heart to beat. ...Read more

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Can I take Allegra (fexofenadine) 24-hour and Sudafed PE together?

Yes: You can take them together. Allegra (fexofenadine) 24 hour is a nonsedating antihistamine and Sudafed PE is a decongestant. This would be similar to taking allegra (fexofenadine) D. What you do not want to do is take Allegra (fexofenadine) D with sudafed, then you would get too much decongestant. Also you want to avoid decongestants if you have certain conditions like hypertension. Also don't take the sudafed at bedtime. ...Read more

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Can I take 24 hour Allegra, (fexofenadine) everyday for a long time? I feel like without it my allergies get really bad no matter what season it is.

Yes: It has been safe to use daily Allegra (fexofenadine) for long periods of time. However, I would recommend that anybody requiring more than occasional use of otc antihistamines be seen by an Allergist to better define triggers and risk. There are many available treatment options to consider. ...Read more

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I took sudafed 24 hour and allegra 12 this morning now I have dry mouth and throat. Badly how much longer will it last I'm having trouble sleeping?

I took sudafed 24 hour and allegra 12 this morning now I have dry mouth and throat. Badly how much longer will it last I'm having trouble sleeping?

Sudafed: Unfortunately insomnia is a known side effect of the drug, doesn't affect all people who use it. The dose would stay in your system may be for a day, meanwhile avoid all sources of caffeine for now, as it would add up to the problem, wish you well ...Read more

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My husband severe seasonal allergies. He is taking 24 hour allegra (fexofenadine) but it is only effective for 12 hours at best. What should he do in addition.

My husband severe seasonal allergies. He is taking 24 hour allegra (fexofenadine) but it is only effective for 12 hours at best. What should he do in addition.

See your doctor.: It may be that your husband needs more than just an antihistamine to control his symptoms. There are good prescription medications available. Often, they can be tailored specifically to his symptoms. But why suffer? Make an appointment. Desensitization therapy may be a possibility once his specific allergens are identified. Good luck. LGromkoMD ...Read more

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Why will happen if you take a Claritin (loratadine) 24 hour and then 12 hours later take an allegra allergy pill?

Why will happen if you take a Claritin (loratadine) 24 hour and then 12 hours later take an allegra allergy pill?

Not serious: Since it takes several doses of a medication to get therapeutic levels, taking a second allergy medication too soon should not have any bad effects. You may have a few more side effects. ...Read more

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Can I take Advil Sinus Congestion and Pain with Allegra Allergy 24 hour together? I have a cold with nasal congestion.

No benefit: Yes, but there is no added benefit to take the Allegra (fexofenadine) since it doesn't help much when you have a cold. An older antihistamine like Chlorpheneramine may help with runny nose but may cause drowsiness. ...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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I accidently took two 24hr allegra d on may 1 still have some side effects how long will the med will stay in ur system?

Probably 24 hrs: This dose is fine since Allegra has a high margin of safety. I do not expect much side effects at all. The biologic effect will last around a day but there may still be traces of the drug present in your body for a couple more days. ...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