The best thing to get for a runny nose depends on what’s causing it. Antihistamines work best for allergy-related runny noses, while decongestants target the congestion that comes with colds and other infections. A saline rinse is one of the cheapest and most broadly effective options regardless of the cause. Most people benefit from a combination of approaches rather than a single product.
Figure Out the Cause First
A runny nose from allergies and one from a cold feel different, and they respond to different treatments. Allergies almost always come with itchy, watery eyes and frequent sneezing but rarely cause a sore throat, cough, or fever. A cold typically brings a sore throat, sometimes a low fever, and general fatigue. Colds last 3 to 10 days (though a lingering cough can stick around longer), while allergy symptoms persist as long as you’re exposed to the trigger.
This distinction matters at the pharmacy. Grabbing a decongestant for an allergy problem or an antihistamine for a viral cold means you’re treating the wrong mechanism, and you’ll wonder why nothing is helping.
Antihistamines for Allergy-Related Runny Noses
If your runny nose comes with itchy eyes, sneezing fits, and no fever or sore throat, an antihistamine is your best bet. These medications reduce the allergic response itself and dry up excess mucus. You’ll find two types on the shelf:
- Older (first-generation) antihistamines like diphenhydramine (Benadryl) and chlorpheniramine tend to dry out nasal passages more aggressively, but they cause significant drowsiness. They’re a reasonable choice at bedtime if your runny nose is keeping you up.
- Newer (second-generation) antihistamines like loratadine (Claritin), cetirizine (Zyrtec), and fexofenadine (Allegra) are less sedating and last longer, making them better for daytime use.
Decongestants for Colds and Infections
When a cold or sinus infection is behind your runny nose, decongestants can help. They work by narrowing blood vessels in the nasal lining, which reduces swelling and slows mucus production. Oral decongestants containing pseudoephedrine (sold behind the pharmacy counter) or phenylephrine are the most common options.
One important warning: these medications stimulate your nervous system in a way similar to caffeine. They can cause restlessness, insomnia, and agitation, so avoid taking them close to bedtime. People with high blood pressure should be especially cautious.
Nasal decongestant sprays (like oxymetazoline) offer fast, targeted relief, but you should not use them for more than three days. After about three days, these sprays can trigger a rebound effect where your congestion actually gets worse, a condition called rhinitis medicamentosa. Stick to the limit on the package.
Saline Rinse: The Low-Cost Option That Works
Nasal irrigation with salt water is one of the simplest and most effective treatments for a runny nose, whether it’s caused by allergies, a cold, the flu, or a sinus infection. It thins mucus, flushes out allergens and irritants, and reduces swelling in the nasal passages. Studies show that both children and adults with allergies who use nasal irrigation see symptom improvement lasting up to three months.
You can buy a premade saline kit or a neti pot at most pharmacies. To make your own solution, mix one to two cups of distilled or boiled water (cooled to lukewarm) with a quarter to half teaspoon of non-iodized salt. Do not use tap water, as it can contain organisms that are harmful when introduced into nasal passages.
To use it: lean over a sink, turn your head so one ear faces down, and breathe through your mouth. Place the spout in your upper nostril and let the solution flow through and out the lower nostril. Blow your nose afterward to clear any remaining liquid. You can safely do this once or twice a day while symptoms last.
Home Remedies Worth Trying
A humidifier adds moisture to dry indoor air, which can soothe irritated nasal passages and help thin mucus. Warm-mist and cool-mist humidifiers are equally effective since the vapor reaches your airways at the same temperature regardless of how it started. If you have young children, always use a cool-mist model to avoid burn risks from hot water or steam.
Staying well hydrated helps keep mucus thin and easier to clear. Warm liquids like tea, broth, or warm water with honey can be especially soothing. Elevating your head with an extra pillow at night helps mucus drain rather than pooling and worsening congestion.
Zinc May Shorten a Cold
If your runny nose is part of a cold, zinc lozenges or tablets taken early in the illness may help you recover faster. A meta-analysis of randomized trials found that people who took sublingual or intranasal zinc resolved their symptoms roughly two days sooner than those who took a placebo. The benefit appears strongest when you start within the first 24 hours of symptoms. Zinc is widely available as lozenges at pharmacies and grocery stores.
What to Know for Children
Most over-the-counter cold and cough medications are labeled “do not use in children under 4 years of age.” The FDA goes further, warning against these products in children younger than 2 because of the risk of serious, potentially life-threatening side effects. For young children, saline drops, a bulb syringe to gently suction mucus, and a cool-mist humidifier are the safest approaches.
Signs Something More Serious Is Happening
Most runny noses resolve on their own within a week or so, but certain symptoms point to something that needs medical attention. Contact a healthcare provider if your symptoms last more than 10 days, if you develop a high fever, if the discharge turns yellow-green (which can signal a bacterial infection), if you have significant facial pain, or if the discharge is bloody. A runny nose that starts after a head injury also warrants immediate evaluation.
For infants younger than 2 months, any fever alongside a runny nose is a reason to call the pediatrician. The same applies if congestion is making it difficult for a baby to nurse or breathe.