Most over-the-counter cold remedies that work for ordinary stuffy noses also help with COVID congestion, because the underlying problem is similar: inflamed, swollen nasal tissues and excess mucus. Pseudoephedrine, saline rinses, intranasal corticosteroid sprays, and guaifenesin are the strongest options backed by evidence. The trickier part is knowing which products actually contain effective ingredients, since one of the most common decongestant ingredients sold in the United States has recently been found not to work at all.
Why COVID Makes You So Congested
SARS-CoV-2 triggers a powerful inflammatory response in the respiratory tract. The virus infects cells lining the nose and airways, and the immune system responds by flooding the area with inflammatory signaling molecules. This cascade can lead to overproduction of mucus that blocks the nasal passages and sometimes the lower airways as well.1PubMed Central. Cytokine Storm and Mucus Hypersecretion in COVID-19: Review of Mechanisms The result feels a lot like a bad cold: stuffiness, postnasal drip, sinus pressure, and difficulty breathing through the nose. For most people with mild or moderate COVID, congestion peaks in the first few days of illness and gradually clears over one to two weeks.
Pseudoephedrine Is the Oral Decongestant That Actually Works
If you want a pill that reliably opens your nose, pseudoephedrine is the one with real evidence behind it. It works by narrowing the blood vessels in your nasal lining, which reduces swelling and lets air through. Multiple randomized trials have shown it beats placebo for congestion relief. In one study, adults given pseudoephedrine showed measurably lower nasal airway resistance within a few hours, and the benefit held up after several days of dosing.2American Journal of Rhinology. Efficacy and Safety of Single and Multiple Doses of Pseudoephedrine in the Treatment of Nasal Congestion associated with Common Cold Another trial confirmed that pseudoephedrine significantly reduced congestion severity over an eight-hour window compared to placebo.3PubMed Central. A Multicenter, Randomized, Placebo-Controlled Study of Pseudoephedrine for the Temporary Relief of Nasal Congestion in Children With the Common Cold When combined with an anticholinergic agent (the kind of ingredient found in some multi-symptom cold formulas), objective measures of congestion improved even further.4PubMed. Therapeutic effects of an anticholinergic-sympathomimetic combination in induced rhinovirus colds
The catch is that pseudoephedrine is kept behind the pharmacy counter in the U.S. You don’t need a prescription, but you do have to ask a pharmacist and show identification. Many people grab whatever is on the open shelf instead, and that is where the trouble starts.
Phenylephrine Does Not Work as an Oral Decongestant
For years, the most common decongestant ingredient sitting on store shelves was oral phenylephrine. It’s in familiar brand names and multi-symptom cold formulas. But the FDA has determined that it simply doesn’t relieve nasal congestion when taken by mouth. A systematic review found no statistically significant improvement in congestion scores or objective airflow measurements compared to placebo.5Journal of Pharmaceutical Research International. The Efficacy of Oral Phenylephrine as a Decongestant: A Systematic Review The FDA has proposed removing oral phenylephrine from over-the-counter cold medications entirely, after concluding that available data “fail to demonstrate that oral phenylephrine is effective.”6JAMA. FDA Seeks to Remove Oral Phenylephrine From Decongestants
This matters for your shopping trip. If you pick up a daytime cold formula from the shelf and it lists phenylephrine as the decongestant, the congestion relief you feel is likely just a placebo effect. Check the active ingredients label. You want pseudoephedrine, which means going to the pharmacy counter. Phenylephrine still works when sprayed directly into the nose, but the oral versions that come in pills and liquid caps are essentially useless for unstuffing your nose.
Nasal Spray Decongestants and the Rebound Trap
Topical decongestant sprays containing oxymetazoline or xylometazoline provide fast, dramatic relief. They shrink swollen nasal tissue within minutes, and the effect lasts several hours. For the first few days of miserable COVID congestion, they can be a lifesaver, especially at bedtime when stuffiness makes sleep nearly impossible.
The problem is what happens if you keep using them. After roughly three to five days of regular use, a condition called rhinitis medicamentosa can set in: your nasal lining swells back up worse than before whenever the spray wears off, and you feel like you need another dose just to breathe normally.7PubMed. Rhinitis medicamentosa: a review of causes and treatment This rebound congestion creates a cycle where people gradually spray more frequently and in larger amounts, sometimes for weeks or months, without realizing they’ve become dependent on the product.8European Annals of Otorhinolaryngology, Head and Neck Diseases. Rebound congestion and rhinitis medicamentosa: Nasal decongestants in clinical practice. Critical review of the literature by a medical panel
The practical advice here is simple: use nasal decongestant sprays for no more than three consecutive days. If your COVID congestion lasts longer than that (and it often does), switch to other remedies for the remaining stretch.
Saline Rinses Do More Than You’d Expect
Rinsing your nasal passages with salt water sounds too basic to matter, but it has genuine science behind it. A neti pot, squeeze bottle, or pressurized saline canister physically flushes mucus and inflammatory debris out of the nose. There is no drug to wear off, no rebound risk, and you can use it as many times a day as you want.
A randomized trial specifically tested seawater nasal washes in people with COVID and other upper respiratory infections. The active group showed earlier viral load reduction, especially in younger subjects, and a lower percentage of household contacts became infected among those with the Delta variant.9PubMed Central. Seawater nasal wash to reduce symptom duration and viral load in COVID-19 and upper respiratory tract infections: a randomized controlled multicenter trial That trial wasn’t primarily measuring congestion symptom scores, but the mechanical principle is well established: washing out thick mucus makes it easier to breathe. Saline rinses pair well with any of the pharmacological options. Do the rinse first to clear mucus, then apply a medicated spray if you’re using one.
Use distilled, sterile, or previously boiled water. Tap water straight from the faucet carries a very small but real risk of introducing harmful organisms into your sinuses.
Intranasal Corticosteroid Sprays
Steroid nasal sprays like fluticasone (Flonase) and triamcinolone (Nasacort) work differently from decongestant sprays. They reduce inflammation in the nasal lining rather than constricting blood vessels, and they take a day or two to reach full effect. The upside is that they’re safe for extended use, with no rebound congestion risk, and they tackle the root cause of the swelling rather than just masking it.
These sprays are available over the counter and widely used for allergies, but they have shown particular value during COVID. Lab research found that fluticasone reduced SARS-CoV-2 infection in respiratory cells and suppressed the virus-induced increase in tissue permeability.10PubMed. Fluticasone propionate suppresses the SARS-CoV-2 induced increase in respiratory epithelial permeability in vitro That’s a laboratory finding, not a guarantee of clinical benefit, but it’s encouraging. More directly relevant, a systematic review of clinical data found that corticosteroid nasal sprays (fluticasone and triamcinolone acetonide in particular) helped people with COVID-related smell loss recover about 23 days earlier than those using other treatments.11PLOS ONE. Effect of any form of steroids in comparison with that of other medications on the duration of olfactory dysfunction in patients with COVID-19 Since congestion and smell loss often go hand in hand, an intranasal steroid spray can address both problems at once.
If your congestion is going to last more than a few days, an intranasal steroid is probably the single best spray option, either alone or alternated with short courses of a decongestant spray during the worst nights.
Guaifenesin for Thick, Stubborn Mucus
Guaifenesin is the only expectorant legally marketed over the counter in the U.S., and its job is to thin mucus so it drains and clears more easily.12PubMed Central. Role of guaifenesin in the management of chronic bronchitis and upper respiratory tract infections It does not shrink swollen tissue the way a decongestant does, so it won’t produce that instant “my nose just opened up” feeling. Instead, it helps when the main problem is thick, sticky mucus that won’t move. COVID’s tendency to trigger heavy mucus production makes guaifenesin a sensible addition to your treatment plan.
A randomized trial of extended-release guaifenesin combined with pseudoephedrine found significant improvement over placebo for thickened mucus, nasal congestion, sinus pressure, and postnasal drip.13PubMed Central. Extended-Release Guaifenesin/Pseudoephedrine Hydrochloride for Symptom Relief in Support of a Wait-and-See Approach for the Treatment of Acute Upper Respiratory Tract Infections Another trial found the most prominent symptom difference at day four of treatment.14PubMed Central. Patient-reported outcomes to assess the efficacy of extended-release guaifenesin for the treatment of acute respiratory tract infection symptoms Guaifenesin works best when you stay well hydrated; water is what it needs to thin the mucus effectively. Look for it as a standalone product if you want to avoid stacking unnecessary ingredients.
What About Antihistamines?
Antihistamines like diphenhydramine (Benadryl), cetirizine (Zyrtec), and loratadine (Claritin) are staples of cold and allergy medicine cabinets. Histamine does play a role in the inflammatory response to COVID, and researchers have explored the theoretical basis for using antihistamines during infection. However, clinical trial data specifically showing that antihistamines improve COVID nasal congestion is thin. First-generation antihistamines (the drowsy kind) can dry out nasal secretions through their anticholinergic side effects, which some people find helpful for a runny nose. But that drying effect does little for the tissue swelling that causes the stuffy, blocked feeling. Second-generation, non-drowsy antihistamines are even less likely to help with congestion unless allergies are contributing to your symptoms on top of the virus.
If you have known allergies and catch COVID during allergy season, continuing your usual antihistamine makes sense. Otherwise, antihistamines aren’t the most productive choice specifically for the blocked-nose feeling of COVID.
Antiviral Medications and How Quickly Symptoms Resolve
Paxlovid (nirmatrelvir/ritonavir) is the most widely prescribed antiviral for mild-to-moderate COVID. Its primary purpose is preventing progression to severe disease, not providing symptom relief per se. But because it fights the virus directly, symptoms including congestion tend to resolve faster when viral replication is cut short. In one mixed-methods study of outpatients treated with Paxlovid, nasal congestion scores dropped steadily over the first four days and fell below clinically meaningful levels by day four, in line with the timeline of antigen clearance.15Research in Clinical Pharmacy. Mixed-Methods Study of Nirmatrelvir/Ritonavir Treatment for Mild COVID-19 in an Outpatient Setting in China
One thing to be aware of with Paxlovid is its long list of drug interactions. The ritonavir component slows the breakdown of many common medications by inhibiting a liver enzyme responsible for metabolizing roughly 60% of available drugs.16PubMed Central. Interactions listed in the Paxlovid fact sheet, classified according to risks, pharmacological groups, and consequences If you’re on other medications and your doctor prescribes Paxlovid, the pharmacist will check for interactions. Some common drugs (certain statins, blood thinners, heart medications, and sedatives) may need to be paused or adjusted for the five-day treatment course.
Blood Pressure Concerns and Other Special Populations
A widespread belief is that people with high blood pressure should never touch decongestants. The reality is more nuanced. A Cochrane review pooling data from multiple trials found that oral decongestants may have little to no effect on systolic or diastolic blood pressure or heart rate, though the evidence was rated low to very low certainty.17Cochrane Database of Systematic Reviews. Effect of adrenergic agonist oral decongestants on blood pressure A separate trial found that a single standard dose of pseudoephedrine did not significantly change blood pressure in hypertensive patients already taking beta-blockers.18PubMed. No cardiovascular effects of single-dose pseudoephedrine in patients with essential hypertension treated with beta-blockers
That said, the Cochrane review’s “very low certainty” label means we can’t be fully confident in those reassuring numbers. If your blood pressure is poorly controlled or you have significant heart disease, it’s still reasonable to talk to your doctor before using pseudoephedrine. Saline rinses, intranasal corticosteroid sprays, and guaifenesin are all blood-pressure-neutral alternatives that avoid the question entirely.
For young children, over-the-counter oral decongestants are generally not recommended under age four, and many pediatricians advise against them under age six. Saline drops and gentle suction are the mainstays for infants and toddlers. For older children, a study found that applying a mentholated rub (containing camphor, menthol, and eucalyptus oil) to the chest and neck improved parent-rated congestion and sleep quality compared to petrolatum or no treatment, though some mild skin irritation was reported.19Journal of Herbal Medicine. Appropriate use of essential oils and their components in the management of upper respiratory tract symptoms in patients with COVID-19 Mentholated rubs don’t actually open the airway, but they create a cooling sensation that makes people perceive easier breathing.
Steam Inhalation and Other Home Remedies
Breathing in steam from a bowl of hot water or a hot shower is one of the oldest congestion remedies. A randomized trial in primary care found that steam inhalation reduced headache in people with chronic or recurrent sinus symptoms but had no significant effect on other outcomes. The subjective relief many people report probably comes from temporarily moisturizing dry, inflamed nasal tissue and loosening surface mucus, but measurable improvements in congestion are modest at best. It’s harmless, free, and soothing, so there’s no reason to avoid it. Just don’t expect it to replace an actual decongestant.
Staying hydrated, sleeping with your head elevated, and keeping indoor humidity around 40 to 50 percent can all help keep mucus from getting unmanageably thick. These aren’t dramatic interventions, but they set the stage for your medications and rinses to work better.
Vitamin C and Zinc
Supplementing with vitamin C and zinc during respiratory infections has a long, contested history. For COVID congestion specifically, there are no large trials showing they clear a stuffy nose. But a pooled analysis of trials in people with common colds found that a combination of vitamin C and zinc significantly reduced runny nose duration over five days of treatment and produced faster overall symptom relief.20PubMed. A combination of high-dose vitamin C plus zinc for the common cold A broader review concluded that adequate vitamin C and zinc intake can shorten the duration of respiratory infections and reduce symptom severity.21Annals of Nutrition and Metabolism. Immune-Enhancing Role of Vitamin C and Zinc and Effect on Clinical Conditions The effects are modest. Don’t expect zinc lozenges to unclog your nose the way pseudoephedrine will. But given their safety and low cost, they’re a reasonable addition to your overall approach, especially if started early in the illness.
When Congestion Means Something More
Most COVID congestion is a straightforward nuisance that resolves on its own. But lingering or worsening sinus symptoms after the acute infection passes can signal a secondary bacterial sinus infection. The inflammatory changes COVID causes in the sinuses can create conditions where bacteria thrive, and case reports have documented rapidly progressive bacterial sinusitis following severe SARS-CoV-2 infection, including in children.22PubMed. Rapidly Progressive Complicated Acute Bacterial Sinusitis in the Setting of Severe Pediatric SARS-CoV-2 Infection If your congestion gets worse after initially improving, you develop facial pain with fever, or you notice discolored nasal discharge lasting more than ten days, see a doctor. Antibiotics may be needed, and that’s not something you can handle with over-the-counter products.
Congestion Versus Smell Loss
One of COVID’s signature quirks is that it can wipe out your sense of smell even when your nose isn’t particularly blocked. With a typical cold, smell loss is “conductive,” meaning mucus and swelling physically prevent odor molecules from reaching the smell receptors high in the nasal cavity. Clear the congestion, and smell returns. COVID is often different. The virus targets cells in the olfactory epithelium directly, and many patients report sudden smell loss with little or no nasal obstruction at all.23PubMed Central. Self-reported loss of smell without nasal obstruction to identify COVID-19: The multicenter Coranosmia cohort study24PubMed Central. Viral infection and smell loss: The case of COVID-19
This distinction matters for treatment expectations. If your congestion clears up but smell hasn’t returned, decongestants and saline rinses alone won’t fix the problem, because the issue isn’t mechanical blockage. As noted earlier, intranasal corticosteroid sprays (fluticasone and triamcinolone in particular) may help speed olfactory recovery.11PLOS ONE. Effect of any form of steroids in comparison with that of other medications on the duration of olfactory dysfunction in patients with COVID-19 Smell training, which involves repeatedly sniffing a set of strong, familiar scents over weeks to months, is also recommended for persistent cases. If smell hasn’t returned after several weeks, it’s worth consulting an ear, nose, and throat specialist.