Decongestants shrink swollen tissue inside the nose to relieve a stuffy nose. They can help during allergy season, but they don’t treat other allergy symptoms, and some forms come with limits. This guide compares pseudoephedrine, phenylephrine and decongestant nasal sprays, explains the FDA’s phenylephrine proposal and the 3-day nasal spray rule, and lists who should check with a doctor first.
It draws on the FDA, MedlinePlus and the American College of Allergy, Asthma and Immunology (ACAAI). It is general information, not medical advice.
Key takeaways
- Decongestants relieve stuffiness only, not sneezing, itching or a runny nose (ACAAI).
- The FDA has proposed removing oral phenylephrine because it isn’t effective. Products are still sold until a final order (FDA).
- Pseudoephedrine is sold behind the counter with photo ID and monthly limits (FDA).
- Limit decongestant nasal sprays such as oxymetazoline to 3 days (MedlinePlus).
- The FDA doesn’t recommend OTC cough and cold medicines for children under 2 (FDA).
How decongestants work
Decongestants relieve the stuffiness and pressure caused by swollen nasal tissue. They don’t contain antihistamines, so they don’t relieve sneezing, itching or a runny nose (ACAAI). They come as pills and liquids, and as nasal sprays that work within minutes (ACAAI). Oral decongestants are often combined with antihistamines or other medicines in one product (ACAAI).
Types of decongestants
| Ingredient | Form | What to know |
|---|---|---|
| Oxymetazoline (Afrin and others) | Nasal spray | Works fast. Use no more than twice in 24 hours and for no more than 3 days |
| Phenylephrine | Pills and liquids; also nasal sprays | The FDA has proposed removing oral phenylephrine because it found it isn’t effective. The proposal doesn’t affect nasal sprays |
| Pseudoephedrine (Sudafed and others) | Pills and liquids | Sold behind the pharmacy counter with photo ID and monthly limits |
The FDA phenylephrine update
In November 2024 the FDA proposed removing oral phenylephrine as an over-the-counter nasal decongestant after concluding it is not effective. It is not a safety finding: the FDA found very few serious side effects when it is taken as directed. Products can still be sold until the FDA issues a final order, and you may keep using them (FDA). Look for phenylephrine in the active ingredients on the Drug Facts label, and ask a pharmacist about alternatives such as oral pseudoephedrine, decongestant nasal sprays, nasal steroids or nasal antihistamines (FDA).
Buying pseudoephedrine
You don’t need a prescription, but federal law keeps pseudoephedrine behind the counter or in a locked cabinet. You must show photo ID and sign a logbook, and there are daily and monthly purchase limits. Some states add their own rules (FDA). Sudafed PE contains phenylephrine, not pseudoephedrine (FDA).
The 3-day nasal spray rule
Don’t use decongestant nasal sprays for more than a few days unless your doctor says to. Longer use can cause rebound swelling, called rhinitis medicamentosa, which makes congestion worse (ACAAI). For oxymetazoline, MedlinePlus lists every 10 to 12 hours, no more than twice in 24 hours, for no more than 3 days (MedlinePlus). Saline sprays can be used as often as needed (ACAAI). See our nasal spray guide.
Decongestants and children
- Don’t use oxymetazoline spray in children under 6 unless a doctor advises it (MedlinePlus).
- Oral pseudoephedrine isn’t for children under 4. Use caution in children 4 to 11, and don’t give extended-release forms to children under 12 (MedlinePlus).
- Saline drops, a cool mist humidifier and bulb suction can ease a child’s stuffy nose without medicine (FDA).
- The FDA doesn’t recommend over-the-counter cough and cold medicines for children under 2, and makers label them “Do not use in children under 4” (FDA).
Who should check with a doctor first
Ask your doctor or pharmacist before using a decongestant if any of these apply (ACAAI) (MedlinePlus):
- Diabetes
- Enlarged prostate or trouble urinating
- Glaucoma
- Heart disease or high blood pressure
- Pregnancy
- Thyroid disease
- You take a monoamine oxidase (MAO) inhibitor, or took one in the last 2 weeks
- You take medicine for emotional or behavioral problems
Side effects
Oral decongestants can cause trouble sleeping, especially if taken in the afternoon or evening, and may cause urinary problems in men with an enlarged prostate (ACAAI). Caffeine can make pseudoephedrine side effects worse (MedlinePlus). Stop and call your doctor if symptoms don’t improve within 7 days or come with a fever (MedlinePlus).
Better options for allergy congestion
Nasal steroid sprays are the single most effective medicine class for allergic rhinitis and reduce congestion as well as sneezing, itching and a runny nose (ACAAI). See corticosteroid nasal sprays, antihistamines and immunotherapy for longer-term relief.
What actually helps
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HEPA air purifier & filters
A portable HEPA purifier sized to the room can lower airborne particles such as pollen and dust; it only works if you replace filters on schedule. (EPA: Guide to Air Cleaners in the Home)
See the Levoit Core 300 on AmazonSaline nasal rinse kit
Rinsing with saline can clear pollen from the nose; use distilled, sterile or boiled-then-cooled water, never plain tap water. (FDA: Is rinsing your sinuses with neti pots safe?)
See the NeilMed Sinus Rinse kit on AmazonDust-mite pillow & mattress covers
Allergists recommend zippered, allergen-proof encasings for pillows, mattresses and box springs, plus hot-water washing of bedding. (ACAAI: Dust Allergy)
See Hospitology zippered pillow encasements on AmazonFrequently asked questions
Is phenylephrine banned?
No, not yet. The FDA has only proposed removing oral phenylephrine. Products can still be sold until a final order (FDA).
Do I need a prescription for Sudafed?
No. Pseudoephedrine products are sold without a prescription, but from behind the counter with photo ID and purchase limits (FDA).
How long can I use a decongestant nasal spray?
No more than 3 days for oxymetazoline (MedlinePlus). Longer use can cause rebound congestion (ACAAI).
Do decongestants help sneezing and itching?
No. They only treat congestion (ACAAI). Antihistamines or nasal steroids help the other symptoms.
Related reading
Local pollen and allergist guides
Pollen seasons and triggers change by city. See what is in the air near me and where to find an allergist.
City pollen guides
Sources
- ACAAI: Hay Fever (Allergic Rhinitis)
- FDA: Key Information About OTC Oral Phenylephrine
- FDA: Legal Requirements for the Sale and Purchase of Drug Products Containing Pseudoephedrine
- FDA: Should You Give Kids Medicine for Coughs and Colds?
- MedlinePlus: Oxymetazoline Nasal Spray
- MedlinePlus: Pseudoephedrine
Originally written by Madiha Ather Hashmi (2020). Updated November 2026 with current sources.
This page is for general information only and is not medical advice. Talk with your doctor or pharmacist about your symptoms and before starting, stopping or combining any medicine.