Medically reviewed by Austin Ulrich, PharmD
Key Takeaways
- Antihistamines typically work within 1 to 3 hours, while nasal corticosteroids may take several days of consistent use to reach full effectiveness.
- For the best results during allergy season, many medications should be started about two weeks before your symptoms usually begin.
- Understanding the difference between over-the-counter and prescription options like montelukast can help you find a more sustainable and cost-effective management plan.
Understanding Allergy Medication Onset
When itchy eyes, sneezing, and congestion strike, the first question many people ask is how quickly they can find relief. The time it takes for allergy medication to work depends entirely on the type of medication and how it is administered. Some are designed for “rescue” relief, while others are “maintenance” medications meant to prevent symptoms from starting in the first place.
This guide explores the typical onset times for common allergy treatments and how you can manage your costs while seeking relief.
Antihistamines: Fexofenadine, Cetirizine, and Loratadine
Oral antihistamines are the most common first line of defense for seasonal allergies. They work by blocking histamine, the chemical your immune system releases during an allergic reaction. Common options include fexofenadine (Allegra), cetirizine (Zyrtec), and loratadine (Claritin). These medications are all available over the counter (OTC).
Why it matters: These medications are relatively fast-acting. Most people begin to feel relief within 1 to 3 hours. Because they are available OTC and in generic forms, they are an accessible way to manage daily symptoms.
Nasal Corticosteroids: Fluticasone and Budesonide
Nasal corticosteroid sprays like fluticasone (Flonase) and budesonide (Rhinocort) treat the root of the problem with allergy symptoms like a runny nose by reducing inflammation in the nasal passages. They are considered one of the most effective treatments for chronic (long-term) congestion. Nasal corticosteroid sprays are available OTC without a prescription.
Why it matters: Unlike antihistamines, nasal sprays are not “instant.” While you might feel a slight improvement in 6 to 12 hours, it often takes 3 to 7 days of daily use to reach the maximum effect. Healthcare professionals may recommend starting these sprays before allergy season begins to prevent allergy symptoms from becoming severe when allergy season starts.
Leukotriene Modifiers: Montelukast (Singulair)
Montelukast is a prescription medication that works differently from antihistamines. It blocks leukotrienes, which are chemicals the body releases when you breathe in an allergen (like pollen). It is FDA-approved for both seasonal allergies and asthma.
Why it matters: Montelukast is a long-term management medication. It usually takes about 1 to 2 days of consistent use to start working, and it is intended to be taken daily while prescribed. Because it requires a prescription, it is often used for people who do not find enough relief from standard OTC options or who have concurrent asthma symptoms.
| Medication Name | Estimated Average Retail Price | Estimated Super+ RX Member Price |
| Montelukast (Generic) | ~$25.00 – $45.00 | ~$4.00 – $20.00 |
| Singulair (Brand) | ~$350.00 – $550.00 | ~$230.00 – $290.00 |
How to Save on Allergy Medications
Allergy symptoms can last for months, making the cost of daily medication a significant concern for those without comprehensive insurance coverage.
- Compare Generic vs. Brand: Most allergy medications have generic versions that are identical in efficacy but cost much less.
- Shop Around: Prices for montelukast or OTC allergy medications can vary between pharmacies in the same town.
- Use a Discount Coupon: Save up to 85% on your prescription costs. Compare pricing and get verified discounts at over 74,000 trusted pharmacies by visiting Super.com/rx.
When to Take Your Medication for Best Results
Timing is everything when it comes to allergy relief. If you wait until you are already sneezing and congested, the medication has to work harder to “catch up” to the inflammatory response.
What to take for fast relief?
If you need immediate relief, oral antihistamines or antihistamine eye drops (for eye symptoms) are generally the fastest options, usually working within a few hours. Decongestants like Sudafed (pseudoephedrine) can also provide quick relief for a blocked nose, though they should only be used for a few days at a time.
When is the best time of day to take them?
Many healthcare professionals suggest taking allergy medicine at night. Pollen counts are often highest in the early morning, so having the medication already in your system when you wake up can prevent morning flare-ups. Additionally, if your medication causes slight drowsiness, taking it before bed avoids midday fatigue.
When should I stop taking seasonal allergy medications?
You should typically continue your medication until the allergen that triggers you is no longer in the air. For example, if you are allergic to ragweed, you should continue treatment until the first hard frost of the year. Stopping too early can lead to a “rebound” of symptoms as the inflammation returns.
Frequently Asked Questions
Why isn’t my allergy medicine working immediately?
Most maintenance medications, especially corticosteroid nasal sprays and montelukast, require a “build-up” period in your system. If you have been taking a nasal spray for only one day, you likely haven’t reached the full therapeutic benefit yet.
Can I take montelukast and an antihistamine together?
In many cases, a healthcare professional may prescribe both because they target different chemical pathways in the allergic response. However, you should never combine medications without confirming the plan with a healthcare professional first.
Is it safe to take allergy medication every day?
For many people with chronic or seasonal allergies, daily use is necessary to manage symptoms. Modern second-generation antihistamines (like Allegra, Zyrtec, and Claritin) and nasal sprays are generally designed for daily use during the duration of your allergy season.
How do I find the best price for montelukast?
Since montelukast is a prescription-only medication, prices are not always transparent. You can visit Super.com/rx to compare real-time prices at local pharmacies and find a coupon that could save you over $100 compared to the retail price.
Does the Super+ RX coupon work for over-the-counter meds?
The coupon is primarily for prescription medications. However, if a healthcare professional writes a prescription for an OTC medication (like Flonase or cetirizine), the pharmacist may be able to process the discount coupon at the pharmacy counter.
Save on your prescriptions: Compare pricing and get verified discounts at over 74,000 trusted pharmacies. Visit Super.com/rx to find a digital discount coupon and save up to 85% on your medication costs today.
References
Akhouri S, House SA. Allergic Rhinitis. StatPearls. July 16, 2023. Accessed April 15, 2026. https://www.ncbi.nlm.nih.gov/books/NBK538186/
Daley-Yates PT, Larenas-Linnemann D, Bhargave C, Verma M. Intranasal Corticosteroids: Topical Potency, Systemic Activity and Therapeutic Index. J Asthma Allergy. 2021;14:1093-1104. doi:10.2147/JAA.S321332
Farzam K, Sabir S, O’Rourke MC. Antihistamines. StatPearls. December 13, 2025. Accessed April 15, 2026. https://www.ncbi.nlm.nih.gov/books/NBK538188/
Wermuth HR, Badri T, Takov V. Montelukast. StatPearls. March 22, 2023. Accessed April 15, 2026. https://www.ncbi.nlm.nih.gov/books/NBK459301/
Disclaimer:
Generative AI was used in the development of this content. All information in this article has been reviewed by our highly-trained clinicians. We do not provide medical advice. Please, consult a physician.
