Compare Allegra D vs. Zyrtec D

Head-to-head comparisons of medication uses, side effects, ratings, and more.

Allegra D
(Pseudoephedrine / Fexofenadine)

Zyrtec D
(Cetirizine / Pseudoephedrine)

Treats allergy symptoms and congestion. Allegra D (Pseudoephedrine / Fexofenadine) is a combination allergy medicine that's useful if you have congestion and runny nose.Relieves congestion and allergy symptoms. Zyrtec D (Cetirizine / Pseudoephedrine) relieves allergies and congestion without causing daytime sleepiness. It can keep you up at night if you take it too close to bedtime.
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Reviews & ratings
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Reviews for Zyrtec D (Cetirizine / Pseudoephedrine)
75%
+8% vs. Allegra D (Pseudoephedrine / Fexofenadine)
43%
24% vs. Allegra D (Pseudoephedrine / Fexofenadine)
9%
9% vs. Allegra D (Pseudoephedrine / Fexofenadine)
Side effects
Allegra DZyrtec D
  • Back pain 2%
More Allegra D side effects »

We haven’t found good data for Zyrtec D side effects.

FDA side effect reports for Zyrtec D »
How it works
Allegra DZyrtec D
Allegra D (Pseudoephedrine / Fexofenadine) is a combination medicine that relieves allergy symptoms. Fexofenadine (an antihistamine) prevents allergy symptoms like runny nose, sneezing, and itching. Pseudoephedrine (a decongestant) clears your sinuses.Zyrtec D (Cetirizine / Pseudoephedrine) is a combination medicine for allergies. Cetirizine (an antihistamine) prevents allergy symptoms like runny nose, sneezing, and itchy eyes or skin. Pseudoephedrine (a decongestant) clears your sinuses.
Type of medication
Allegra DZyrtec D
DecongestantAntihistamine
2nd generation
Prescription or OTC
Antihistamine
2nd generation
DecongestantPrescription or OTC
Available as
Allegra DZyrtec D
  • Extended release
  • Extended release
Used for (click to learn more)
Allegra DZyrtec D
Risk factors for serious side effects
Allegra DZyrtec D
  • Taking with alcohol
  • Taking other medicines that make you less alert
  • History of high blood pressure
  • History of heart problems
  • Age 65 or older
  • History of seizure
  • Women of childbearing age
Detailed Allegra D (Pseudoephedrine / Fexofenadine) risks & warnings »
  • History of high blood pressure
  • History of heart problems
  • Age 65 or older
  • History of seizure
  • Women of childbearing age
    • Age 65 years or older
    • Taking with alcohol
    • Taking other medicines that make you less alert
    • Current kidney disease
    • Current liver disease
    Detailed Zyrtec D (Cetirizine / Pseudoephedrine) risks & warnings »
    Pregnancy category
    Allegra DZyrtec D
    CFDA pregnancy category (Weigh risks vs. benefits)

    Research studies with animals found harmful effects on unborn babies. It hasn’t been properly studied in humans. The benefits might outweigh the risks even if you’re pregnant. Talk with your doctor.

    See the FDA package insert
    NFDA pregnancy category (Unknown)

    The FDA hasn’t classified this medicine’s effects on unborn babies. Talk with your doctor about this medicine if you’re pregnant or planning on it.

    See the FDA package insert
    Alcohol
    No specific alcohol-related info.No specific alcohol-related info.
    Food
    No specific food-related info.No specific food-related info.
    Kidneys and liver
    • Talk to your doctor if you have high blood pressure or kidney problems before using it.
    • People with kidney or liver disease may need to take a lower dose of Zyrtec D (Cetirizine / Pseudoephedrine) to prevent overdose. Talk with your doctor to be sure you are using the correct dose.
    Sex
    No specific sex-related info.No specific sex-related info.
    Sleep
    • The antihistamine (fexofenadine) can cause dizziness, drowsiness, dry eyes/mouth, and constipation.
    • The decongestant (pseudoephedrine) can make your blood pressure higher and can make it harder to sleep.
    • Avoid taking it close to bedtime to prevent trouble sleeping.
    • The antihistamine (Cetirizine) can cause more drowsiness than similar antihistamines, like Allegra D (which contains Fexofenadine) and Claritin D (which contains Loratadine).
    • You might not sleep as well due to Pseudoephedrine's effects and you can also have strange dreams while taking it.
    • The antihistamine (Cetirizine) in Zyrtec D (Cetirizine / Pseudoephedrine) causes less drowsiness than other medications like Benadryl.
    • It's better to take Zyrtec D (Cetirizine / Pseudoephedrine) early in the morning or when you wake up, otherwise you can have trouble sleeping later.
    • People age 65 and older have a higher risk of troublesome side effects from taking antihistamine medications like Zyrtec D (Cetirizine / Pseudoephedrine). Watch out for changes in vision, severe dry mouth, trouble urinating, or constipation. Also, feelings of drowsiness may leave you "unsteady" on your feet. This can make you more likely to fall causing broken bones or other serious injuries. Talk with your doctor before using Zyrtec D (Cetirizine / Pseudoephedrine) and stop using it if you have side effects.
    Weight
    No specific weight-related info.No specific weight-related info.
    Upsides and benefits
    Allegra DZyrtec D
    • Available without a prescription in the drugstore.
    • It has two medications that work in different ways to help relieve nasal symptoms.
    • The antihistamine (fexofenadine) is useful for relieving itchy eyes, runny nose, or constant sneezing.
    • The decongestant (pseudoephedrine) is very good at relieving congestion.
    • The antihistamine (Cetirizine) in Zyrtec D (Cetirizine / Pseudoephedrine) causes less drowsiness than other medications like Benadryl.
    • The decongestant (Pseudoephedrine) in Zyrtec D (Cetirizine / Pseudoephedrine) is stronger than other decongestants. It can also help relieve congestion-related headaches and ear pressure.
    • The stimulant effects of Pseudoephedrine can give you some extra energy during the day.
    • Doesn't give you rebound congestion (worse congestion symptoms after you stop taking the medicine) like decongestant nose sprays can.
    • It's available without a prescription, unlike other strong allergy medicines.
    Downsides and risks
    Allegra DZyrtec D
    • Has more side effects than Allegra since it has pseudoephedrine in it.
    • The antihistamine (fexofenadine) can cause dizziness, drowsiness, dry eyes/mouth, and constipation.
    • The decongestant (pseudoephedrine) can make your blood pressure higher and can make it harder to sleep.
    • You must show a photo ID to buy this from behind the pharmacy counter. There's a maximum limit on how much you can buy in the pharmacy at a time.
    • You can have more side effects when using combination pills than when using single-ingredient medications.
    • The antihistamine (Cetirizine) can cause more drowsiness than similar antihistamines, like Allegra D (which contains Fexofenadine) and Claritin D (which contains Loratadine).
    • The decongestant (Pseudoephedrine) can make your heart race or give you anxious or restless feelings.
    • You might not sleep as well due to Pseudoephedrine's effects and you can also have strange dreams while taking it.
    • Pseudoephedrine can raise your blood pressure, so don't take it if you have high blood pressure or other heart conditions.
    • Although you don't need a prescription, you do need to show a photo ID to buy this from behind the pharmacy counter.
    Tips from our pharmacists for people taking the medication
    Allegra DZyrtec D
    • It works best if you have nasal congestion and a runny nose.
    • Take on an empty stomach, 1 hour before eating or 2 hours after eating.
    • Shouldn't be used in kids younger than 12 years old.
    • Avoid taking it close to bedtime to prevent trouble sleeping.
    • Can cause dizziness, headache, or a fast heartbeat.
    • Talk to your doctor if you have high blood pressure or kidney problems before using it.
    • If symptoms get worse or you need to use it for more than a few weeks, talk with your doctor.
    • Starts working in 30 minutes.
    • You need to show an ID to buy Zyrtec D (Cetirizine / Pseudoephedrine) in the drugstore because it contains Pseudoephedrine.
    • Don't cut, crush, or chew tablets; swallow them whole.
    • It's better to take Zyrtec D (Cetirizine / Pseudoephedrine) early in the morning or when you wake up, otherwise you can have trouble sleeping later.
    • Can cause an irregular or fast heartbeat, and can raise your blood pressure.
    • If you need to use it for more than a few weeks, talk with your doctor since a different medication might work better for you.
    Learn more
    More about Allegra DSide effectsReviews & ratingsAlternativesFDA package insert
    More about Zyrtec DSide effectsReviews & ratingsAlternativesFDA package insert