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Doctor insights on: Allegra D Not Digesting

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How long does Allegra-D stay in your system?

How long does Allegra-D stay in your system?

12 or 24 hours: Allegra-d 12 hours, stays for 12 hours, as well the 24 hours preparation, stays for 24 hours, it's a combo medicine, ...Read more

Dr. Dariush Saghafi
359 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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Allegra-d nauseates me and makes me jittery, is there anything else that works as well?

Allegra-d nauseates me and makes me jittery, is there anything else that works as well?

Yes- what symptom?: Allegra d is a combo of fexofenadine and pseudoephedrine. The 12-hour preparation has 120 mg of sudafed in it, a lot of decongestant, if you are sensitive. This causes the jitters, and may cause the nausea. If your main symptom is congestion, the answer could be no. If itching, sneezing, etc, try plain fexofenadine. Nasal prescription sprays also work and have less side effects because local only. ...Read more

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Allegra-d nauseates me and makes me jittery, is there anything else that works just as well?

Allegra-d nauseates me and makes me jittery, is there anything else that works just as well?

AllegraD, jittery: Allegra (fexofenadine) d is a combination of non drowsy antihistamine and pseudo Ephedrine (sudafed). For many people decongestant portion causes jitteriness. Since it is a fixed combination with a slow releasing high dose of pseudoehedrine you have no control over the higher dose. You may try allegra, (fexofenadine) and add sudafed
(30 mgm) separately and tolerate it better. May not cause nausea. ...Read more

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Allegra-d side effects?

Allegra-d side effects?

Insomnia, jitters: Allegra d contains 2 drugs. Fexofenadine usually has few side effects, but can be drying to the nasal membranes and mouth, and can have side effects, so check further if you have some. The d portion, on the other hand, is sudafed, and it commonly causes jitters, insomnia, fast heart rate, nausea and headache. It can raise the blood pressure and cause arrhythmias. ...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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I accidently took 2 24hr Allegra d how long will it stay in ur body? I been having side effects for over a week.

1-3 days at most: If you are having side effects after one week since taking this dose then there must be another explanation for your symptoms. Try asking another question entering these persistent symptoms or you could see your regular doctor for an explanation. ...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

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Can I take Claritin (loratadine) d after taking allegra d?

No: Both have pseudoepinedrine in them and too much could cause your blood pressure to increase, your heart to race and would make you jittery. ...Read more

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Is it ok to take 24 Hr Allegra D in the day and a 5 mg Xyzal at night?

Duplication: I suggest using either product but not both: you are double dosing your antihistamines: Allegra-D and Xyzal. Do not mix these medications. ...Read more

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I accidentally took 2 Allegra-D; 1@ 10pm and 1 @ 6:30am today. Should I worry? Just feeling a little woozy, but otherwise ok.

I accidentally took 2 Allegra-D; 1@ 10pm and 1 @ 6:30am today.  Should I worry? Just feeling a little woozy, but otherwise ok.

Not to worry: The dose and timing of Allegra-D is not concerning. Be careful with the decongestant part as this can cause issues with high blood pressure and elevated heart rate, especially if you already suffer from underlying cardiovascular conditions. ...Read more

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I've been taking Allegra D daily for years & it helps a lot with my allergies. Is long term Pseudophedrine use bad? What about developing a tolerance?

Allegra D: Fortunately this product has been around for many years. It is ALWAYS best to stop a medication if you can. Try Breakfast in Bed. Hot tea, etc BEFORE you get out of bed might prevent allergy symptoms.
Personally I prefer nasal type sprays because their effect is limited to nose only, not to entire body. ...Read more

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Can you take Claritin d and Allegra d together?

No: Because the additive doses of the d in both compounds may be too much for your heart or emotion. ...Read more

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Can you take Allegra D and Tylenol PM together?

Can you take Allegra D and Tylenol PM together?

Yes you can, however: If you are taking the tylenol pm to help you sleep, it might not work in case you are taking the allegra-d 24 hours, but if taking the allegra-d 12 hours in the morning then the tylenol pm would work at night.

Good that you asked, always exercise caution with multiple medications ...Read more

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Are allegra d and Benadryl (diphenhydramine) the same?

Antihistamine differ: They are not. Both are over the counter antihistamines. The similarity ends there. Allegra d contains Pseudoephedrine as a decongestant and fexofenadine as an antihistamine. Fexofenadine is non-drowsy. Benadryl is also an antihistamine called diphenhydramine. It is also the active ingredient in most otc sleeping pills and can be very sedating. ...Read more

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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