Compare Allegra D vs. Phenylephrine

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

Allegra D
(Pseudoephedrine / Fexofenadine)

phenylephrine

Treats allergy symptoms and congestion. Allegra D (Pseudoephedrine / Fexofenadine) is a combination allergy medicine that's useful if you have congestion and runny nose.Clears your sinuses. Sudafed Pe (Phenylephrine) is a good medication for relieving stuffy nose. It doesn't work as well as pseudoephedrine (Sudafed), but it has fewer side effects.
Reviews & ratings
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Have you used Allegra D (Pseudoephedrine / Fexofenadine)?
Worth itNot sureNot worth it
Reviews for Phenylephrine
44%
+27% better vs. Allegra D
24%
+47% better vs. Allegra D
10%
+10% better vs. Allegra D
164 reviews
Have you used Sudafed Pe (Phenylephrine)?
Worth itNot sureNot worth it
Side effects
Allegra DPhenylephrine
  • Back Pain 2%
  • Headache 3%
  • Throat Irritation 2%
  • Dizziness 2%
  • Agitation 2%
  • Palpitation 2%
  • Dry Mouth 3%
  • Dyspepsia 3%
  • Adverse effects 4%
More Allegra D side effects »

We haven’t found good data for Phenylephrine side effects.

FDA side effect reports for Phenylephrine »
How it works
Allegra DPhenylephrine
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.Sudafed Pe (Phenylephrine) is a decongestant. It narrows blood vessels and reduces swelling in your nasal passages to make breathing easier.
Type of medication
Allegra DPhenylephrine
Prescription or OTCLower-cost generic availablePrescription or OTCLower-cost generic available
Available as
Allegra DPhenylephrine
  • Extended release
  • Pill
  • Nasal spray
  • Eye drops
  • Suppository
Used for
Allegra DPhenylephrine
Risk factors for serious side effects
Allegra DPhenylephrine
  • Taking with alcohol
  • Taking other medicines that make you less alert
  • History of high blood pressure
  • History of heart problems
  • Age 65 or older
Detailed Allegra D (Pseudoephedrine / Fexofenadine) risks & warnings »
  • History of high blood pressure
  • Taking MAO inhibitors
  • History of heart problems
  • Age 65 years or older
  • Women of childbearing age
Detailed Sudafed Pe (Phenylephrine) risks & warnings »
Pregnancy

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.

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.

Sleep
Allegra DPhenylephrine
  • The antihistamine (fexofenadine) can cause dizziness, drowsiness, dry eyes/mouth, and constipation.
No sleep related info.
Upsides and benefits
Allegra DPhenylephrine
  • 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.
  • Works to clear nasal congestion and helps you breathe better.
  • Helpful in relieving congestion-related headaches.
  • Has fewer side effects than other decongestants like pseudoephedrine.
  • It doesn't raise your blood pressure and heart rate as much, or cause as much trouble falling asleep.
  • Doesn't give you rebound congestion (worse symptoms when you stop taking it) like nasal spray decongestants do.
Downsides and risks
Allegra DPhenylephrine
  • 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.
  • Phenylephrine doesn't last as long as other decongestants like pseudoephedrine (Sudafed).
  • You shouldn't use it if you have high blood pressure.
  • Can make your heart race or make you feel anxious and restless.
  • Shouldn't use it before you want to sleep.
  • Not as effective after using it for 4 days in a row.
Tips from our pharmacists for people taking the medication
Allegra DPhenylephrine
  • 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.
  • Phenylephrine can make you restless, so don't take it too close to bedtime.
  • It's in other cold and flu combination medicines. Read labels closely so you don't accidentally double up and take too much of it in a day.
  • Follow age-specific dosing instructions on how much to take.
  • Let your doctor know if your symptoms don't improve in a few days.
Learn more
More about Allegra DSide effectsReviews & ratingsAlternativesFDA package insert
Have you used Allegra D (Pseudoephedrine / Fexofenadine)?
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More about PhenylephrineSide effectsReviews & ratingsAlternativesFDA package insert
Have you used Sudafed Pe (Phenylephrine)?
Worth itNot sureNot worth it