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Decongestant tablets: pseudoephedrine vs phenylephrine

By the Life in Good Form editors. Updated 2026-10-15.

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Quick answerThe two oral decongestants on pharmacy shelves are pseudoephedrine (Sudafed 12 Hour, 120 mg) and phenylephrine (Sudafed PE, 10 mg). In November 2024 the FDA proposed removing oral phenylephrine as a nasal decongestant because its review found it is not effective for that use; it was not a safety finding, and products can still be sold until a final order. Pseudoephedrine remains an option, and the FDA also lists decongestant nasal sprays, nasal steroids and nasal antihistamines. Both oral decongestants carry the same warnings: ask a doctor first if you have heart disease, high blood pressure, thyroid disease, diabetes or an enlarged prostate.
Our picks at a glance

Compare the picks and what to watch out for

Sudafed 12 Hour vs Sudafed PE

DetailSudafed 12 HourSudafed PE
Amount per tabletPseudoephedrine HCl 120 mg, extended releasePhenylephrine HCl 10 mg
Adult dose (12 and over)1 tablet every 12 hours; not more than 2 in 24 hours1 tablet every 4 hours; not more than 6 in 24 hours
Children under 12Do not use this productAsk a doctor
FDA statusRemains an FDA-listed decongestant optionFDA proposed removal of oral phenylephrine as a decongestant (not yet final)

Details are from the Sudafed 12 Hour and Sudafed PE Sinus Congestion DailyMed labels and the FDA's key information page on oral phenylephrine.

What the FDA found about oral phenylephrine

On November 7, 2024, the FDA proposed removing oral phenylephrine as a nasal decongestant active ingredient, the first step toward finalizing its determination that it is not effective for this use. The FDA said oral phenylephrine is widely used and that it found very few cases of serious side effects when taken as the label directs, so this is about effectiveness, not safety.

Products with oral phenylephrine can continue to be marketed until a final order. The action applies only to phenylephrine taken by mouth, not to nasal sprays. Many combination cold and sinus products contain oral phenylephrine, so check the Drug Facts label for the active ingredients.

Other options the FDA lists

For people looking for alternatives, the FDA's key information page lists oral pseudoephedrine, nasal sprays with decongestants, nasal corticosteroids and nasal antihistamines. It also mentions cool mist humidifiers and saline sprays, and nasal suctioning for children.

Who should ask a doctor first

Both labels say do not use an oral decongestant if you are now taking a prescription monoamine oxidase inhibitor (MAOI), for depression, psychiatric or emotional conditions, or Parkinson's disease, or for 2 weeks after stopping one. If you do not know whether your prescription contains an MAOI, ask a doctor or pharmacist.

Ask a doctor before use if you have heart disease, high blood pressure, thyroid disease, diabetes, or trouble urinating due to an enlarged prostate gland. If pregnant or breastfeeding, ask a health professional before use.

Side effects and when to stop

Sleeplessness is one of the stop-use signs on both labels, so if a decongestant keeps you awake, stop and ask a doctor or pharmacist about other options rather than adding a sleep aid.

Buying pseudoephedrine

Pseudoephedrine sales are subject to legal requirements, and the FDA's key information page links to them. In practice that means you may need to ask at the pharmacy counter for pseudoephedrine products, while phenylephrine products are usually on open shelves. Ask the pharmacist which option fits your health conditions and other medicines.

The Sudafed 12 Hour label says each tablet contains calcium 45 mg, to store tablets in a dry place at 20 to 25 C (68 to 77 F), and to protect them from light.

What to look for when you buy

Sudafed 12 Hour (pseudoephedrine 120 mg)

Best for: Adults wanting an oral decongestant the FDA still lists as an option

Its label lists pseudoephedrine HCl 120 mg, 1 tablet every 12 hours.

Watch out: Ask a doctor first with heart disease, high blood pressure, thyroid disease or diabetes.

See options on Amazon

Saline nasal spray

Best for: A drug-free way to moisten nasal passages

The FDA lists saline sprays among options for nasal congestion.

Watch out: Saline does not shrink swollen nasal tissue like a decongestant.

See options on Amazon

Cool mist humidifier

Best for: Congestion at night

The FDA lists cool mist humidifiers among options for congestion.

Watch out: Clean it as the maker directs.

See options on Amazon
When to talk to a doctor: Do not use oral decongestants with MAOIs. Ask a doctor first if you have heart disease, high blood pressure, thyroid disease, diabetes or prostate problems, and see a doctor if symptoms last over 7 days or come with fever.

Questions people ask

Does phenylephrine work as a decongestant?
The FDA proposed removing oral phenylephrine as a decongestant in 2024 after finding it is not effective for that use.
Is Sudafed PE the same as Sudafed?
No. Sudafed PE contains phenylephrine; Sudafed 12 Hour contains pseudoephedrine.
Is oral phenylephrine unsafe?
The FDA said its action is about effectiveness and it found very few serious side effects when used as directed.
How long can I take a decongestant?
Stop and ask a doctor if symptoms do not improve within 7 days or occur with a fever.
Who should not take decongestants?
Ask a doctor first with heart disease, high blood pressure, thyroid disease, diabetes or an enlarged prostate; avoid with MAOIs.
Do decongestant nasal sprays use phenylephrine too?
Some do; the FDA says its proposal applies only to phenylephrine taken by mouth, not to nasal sprays.

Sources

Sources checked 2026-10-15.

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