Most coughs from colds and upper respiratory infections resolve on their own within one to three weeks, but that does not make the wait any more bearable. Several remedies can genuinely shorten the misery or at least dull the urge to cough while your body heals. Some have surprisingly strong evidence behind them, while others ride largely on the placebo effect, which in cough research is no small thing. Here are nine approaches worth trying, along with what the science actually says about each.
1. Honey
If you try only one remedy, make it this one. Honey is the best-studied natural cough treatment, and the evidence is unusually clear for something you already have in your kitchen. A Cochrane review of trials in children found that honey reduced cough frequency better than no treatment and performed about as well as dextromethorphan, the active ingredient in most over-the-counter cough syrups.1Cochrane Database of Systematic Reviews. Honey for acute cough in children A separate meta-analysis in adults and children confirmed that honey reduced both cough frequency and severity compared with usual care.2PubMed. Effectiveness of honey for symptomatic relief in upper respiratory tract infections: a systematic review and meta-analysis
Honey works partly as a demulcent, meaning it coats and soothes irritated tissue in the throat. It may also have mild antimicrobial properties, though for a typical cold-related cough the soothing action is likely the main benefit. A spoonful before bed, or stirred into warm water or tea, is the simplest delivery method. The Cochrane evidence suggests the benefit is strongest during the first three days of use; beyond that, honey did not outperform placebo for cough severity or sleep disruption.1Cochrane Database of Systematic Reviews. Honey for acute cough in children So think of it as an early-stage intervention rather than a long-term fix.
One critical safety note: never give honey to a child under one year old. Honey is the only well-documented food source of Clostridium botulinum spores, which can cause infantile botulism in babies whose gut flora is not yet mature enough to neutralize them.3PubMed Central. The hazards of honey: infantile botulism4PubMed Central. Infant Botulism: In Search of Clostridium botulinum Spores
2. Menthol
Menthol is the cooling compound in peppermint, and it shows up in cough drops, vapor rubs, and chest balms for good reason. Research in guinea pigs demonstrated that menthol suppresses cough triggered in the lower airways through a reflex that originates in the nose, mediated by cold-sensitive receptors called TRPM8.5PubMed Central. The role of trigeminal nasal TRPM8-expressing afferent neurons in the antitussive effects of menthol In human studies, menthol and sweet taste both raised the threshold at which a cough reflex is triggered, meaning it takes a stronger irritant to make you cough.6PubMed Central. Sweet Taste and Menthol Increase Cough Reflex Thresholds
The practical takeaway: menthol lozenges work partly by delivering the compound to your nose and throat simultaneously. Vapor rubs applied to the chest accomplish something similar, since you inhale menthol vapors as body heat releases them. The effect is temporary, but it can ease nighttime coughing enough to help you fall asleep. If lozenges bother your stomach or you simply dislike them, rubbing a menthol-based balm on your chest and neck before bed gives a comparable result.
3. Over-the-Counter Cough Suppressants
Dextromethorphan (often abbreviated DXM or DM on product labels) is the most common cough suppressant in pharmacy aisles. The evidence on it is more mixed than manufacturers might like you to believe. On one hand, a review of acoustic cough-monitoring studies found that a 30-mg dose significantly reduced objective cough counts compared with placebo, with the effect peaking about two hours after dosing and lasting as long as 24 hours.7Cough. Comprehensive evidence-based review on European antitussives On the other hand, at least one clinical trial found very little support for a meaningful effect from the same 30-mg dose in patients with cough from an acute upper respiratory infection.8Journal of Pharmacy and Pharmacology. Antitussive Efficacy of Dextromethorphan in Cough Associated with Acute Upper Respiratory Tract Infection
The likely explanation for this discrepancy is that some of the positive results came from syrup formulations, which combine the pharmacological effect of the drug with the demulcent action of the syrup itself. A capsule strips away the soothing syrup layer, and when researchers did that, the effect shrank. So if you reach for a DM product, the syrup form may genuinely outperform tablets or capsules, not because the drug is better in liquid form, but because the syrup is doing its own separate job coating your throat.
4. Guaifenesin
Where dextromethorphan tries to suppress the urge to cough, guaifenesin takes the opposite approach: it thins and loosens mucus so your coughs become more productive and you clear your airways faster.9PubMed Central. Role of guaifenesin in the management of chronic bronchitis and upper respiratory tract infections This is the active ingredient in products marketed as expectorants.
Guaifenesin makes the most sense when your cough is wet and phlegmy rather than dry and tickly. If your body is already trying to move mucus out, helping it along can reduce the total number of coughing bouts. The evidence for guaifenesin’s effectiveness in acute cough is modest, and clinical guidelines note that there is inadequate proof that expectorants meaningfully shorten the course of a typical acute cough.10PubMed Central. The diagnosis and treatment of acute cough in adults Still, many people find subjective relief, and the side-effect profile is mild. Drink plenty of water alongside it, since the mechanism depends on keeping mucus hydrated.
5. Thyme-Ivy Herbal Extract
This one surprises people, but the data is hard to dismiss. A combination of thyme herb and ivy leaf extract has been tested in randomized trials for acute bronchitis with productive cough. In one trial, people taking the herbal combination saw coughing fits drop by about 69% from baseline, compared with roughly 48% in the placebo group, and reached the 50% improvement mark two full days earlier.11PubMed. Efficacy and tolerability of a fluid extract combination of thyme herb and ivy leaves and matched placebo in adults suffering from acute bronchitis with productive cough A larger observational study of over 700 patients found that about 87% reported a meaningful improvement in cough severity after an average treatment period of one week.12PubMed. Effectiveness and tolerability of the thyme/ivy herbal fluid extract BNO 1200 for the treatment of acute cough: an observational pharmacy-based study
These products are widely available in European pharmacies and increasingly found online elsewhere. They are typically sold as syrups or liquid extracts. If you decide to try one, look for a product that specifies thyme and ivy leaf as the active ingredients and check that it comes from a regulated manufacturer, since quality control in the supplement market can be inconsistent.
6. Salt Water Gargle
Gargling warm salt water is one of the oldest home remedies for throat irritation. The logic is straightforward: the salt draws moisture out of swollen tissue, temporarily reducing inflammation and the tickle that triggers coughing. Research on salt water’s antiviral properties has been less convincing. One laboratory study found that even high concentrations of sodium chloride had no direct ability to kill SARS-CoV-2, though earlier work suggested that salt solutions could enhance the antiviral defenses of epithelial cells against some other viruses.13Scientific Reports. The effectiveness of various gargle formulations and salt water against SARS-CoV-2
In practical terms, salt water gargling is best understood as a comfort measure rather than a treatment that speeds recovery. If your cough is driven by a raw, scratchy throat, the temporary relief can buy you an hour or two of reduced coughing. Dissolve roughly half a teaspoon of salt in a cup of warm water, gargle for 15 to 30 seconds, and spit. Repeat a few times a day as needed. The cost is zero and the risk is essentially nonexistent.
7. Elevating Your Head at Night
Coughing often worsens when you lie flat. Gravity pulls mucus from the sinuses down the back of the throat, and stomach acid is more likely to creep upward when you are horizontal. Sleeping with your head elevated, either by adding an extra pillow or propping the head of your bed up a few inches, can reduce both problems. European Respiratory Journal guidelines note that elevating the head during sleep is one of the lifestyle measures recommended for cough related to acid reflux, alongside dietary changes and weight management.14European Respiratory Journal. The diagnosis and management of chronic cough
Even when reflux is not the culprit, keeping your airway slightly angled helps mucus drain downward into the stomach rather than pooling in the back of your throat while you sleep. This is especially helpful for the nagging dry cough that appears only at bedtime. A wedge pillow designed for this purpose works better than stacking regular pillows, which tend to kink the neck without truly elevating the upper body.
8. Reducing Airborne Irritants
Dust, pet dander, smoke, and other airborne particles keep cough receptors in a state of heightened alert. If you are coughing from a cold, layering environmental irritants on top of already inflamed airways makes everything worse. A randomized trial of portable air cleaners in people with chronic lung disease found that those given active HEPA filters reported significantly greater improvement in respiratory symptoms and used rescue inhalers less frequently compared with a sham-filter control group.15American Journal of Respiratory and Critical Care Medicine. Randomized Clinical Trial of Air Cleaners to Improve Indoor Air Quality and Chronic Obstructive Pulmonary Disease Health: Results of the CLEAN AIR Study
You do not need a clinical-grade air filter to benefit. Opening windows when outdoor air quality is good, keeping pets out of the bedroom while you are sick, and avoiding scented candles or strong cleaning products can meaningfully reduce the irritant load on your airways. If you smoke or live with a smoker, this is also the single most impactful environmental change you can make for a lingering cough.
9. Marshmallow Root
Marshmallow root (from the plant Althaea officinalis, not the confection) has been used for centuries as a throat soother. The root contains polysaccharides that form a mucus-like coating over irritated tissue, physically shielding the nerve endings that trigger coughing.16PubMed. Aqueous extracts and polysaccharides from Marshmallow roots (Althea officinalis L.): cellular internalisation and stimulation of cell physiology of human epithelial cells in vitro This bioadhesive action is similar to what honey does, but marshmallow root has the advantage of being available in lozenges, teas, and syrups for people who want an alternative to honey or cannot take it.
The clinical evidence for marshmallow root specifically is thinner than for honey or the thyme-ivy combination, and much of the support comes from in vitro cell studies and traditional use rather than large-scale trials. Still, the mechanism is plausible and the safety profile is very good. If you have a dry, scratchy cough and want a non-medicated option, marshmallow root tea or lozenges are reasonable choices.
Why Coughs Linger After a Cold
Understanding why you are still coughing can help you choose the right remedy. When a virus infects the respiratory tract, it damages the lining of the airways. Even after the infection clears and symptoms like fever and congestion resolve, some people are left with a persistent cough that can hang around for weeks. This postinfectious cough is thought to result from ongoing inflammation, excess mucus production, and temporarily heightened sensitivity of cough receptors.17PubMed. Postinfectious cough: ACCP evidence-based clinical practice guidelines18PubMed. Progress in the pathogenesis of post-infectious persistent cough
When cough receptors are hypersensitive, stimuli that would not normally trigger a cough, such as cold air, light perfume, or even talking, can set one off. This is why your cough might persist long after you feel otherwise healthy. It also explains why demulcent remedies like honey and marshmallow root can be useful: they do not fight infection, but they calm the irritated surface that is sending false alarm signals.
Post-Nasal Drip and Hidden Triggers
If your cough is chronic or keeps coming back, the cause may not be a cold at all. Post-nasal drip, where excess mucus from the sinuses drains down the back of the throat, is one of the most common reasons for a persistent cough. In one study, over 70% of patients with chronic post-nasal drip responded positively to a first-generation antihistamine-decongestant combination.19PubMed Central. Clinical Aspects of Chronic Idiopathic Postnasal Drip: An Entity Not to Be Overlooked That response rate is notable because it suggests many people suffering from an unexplained cough have a treatable nasal component they never considered.
Acid reflux is another hidden driver. Stomach acid reaching the upper airway can trigger coughing without the classic heartburn symptoms, making it easy to miss. CHEST guidelines found that lifestyle modifications like diet changes and weight loss improved reflux-related cough, but proton pump inhibitors alone did not show benefit in isolation.20Chest. Chronic Cough Due to Gastroesophageal Reflux in Adults: CHEST Guideline and Expert Panel Report If your cough worsens after meals or when lying down and does not respond to the remedies above, reflux is worth investigating with your doctor.
Cough Medicine and Children
The rules for children are stricter than for adults. The FDA has repeatedly warned against giving over-the-counter cough and cold products to children under two, and many pediatricians extend that caution to children under six. These products generate billions of dollars in annual sales despite a lack of strong evidence for their effectiveness in young children, and they carry real risks of side effects including sedation, rapid heart rate, and, in overdose, seizures.21PubMed Central. Use of antitussive medications in acute cough in young children22PubMed Central. The Latest Update on Over-the-Counter Cough and Cold Product Use in Children
For children over one year old, honey remains the best-supported option. A half teaspoon for toddlers or a full teaspoon for older children, given before bed, matches or outperforms dextromethorphan in trials.23PubMed. Honey for acute cough in children Cool-mist humidifiers, saline nose drops, and keeping fluids up round out the safe pediatric toolkit. For infants under one year, where honey is off-limits, saline drops and gentle nasal suctioning are the primary options. If a very young child is coughing hard enough to affect feeding or breathing, that warrants a call to the pediatrician rather than a trip to the pharmacy.
The Placebo Effect Is Enormous in Cough
Here is something researchers know but rarely gets mentioned in remedy listicles: the placebo effect in cough studies is strikingly large. In acute cough trials, a placebo alone can reduce coughing by up to 85%.24ERJ Open Research. Decoding the impact of the placebo response in clinical trials for chronic cough That means even in the control arms of studies, where people received a sugar pill or an inert syrup, most of them got dramatically better.
This does not mean cough remedies are useless. It means the act of taking something, believing it will help, and engaging in a soothing ritual (sipping warm liquid, sucking a lozenge) may itself trigger neurological changes that raise your cough threshold. The honey and dextromethorphan results are measured against this already-powerful baseline, so the fact that they still beat placebo, even modestly, is meaningful. But it also means that any warm, sweet liquid you find comforting is likely doing more than you think, even if it contains no active ingredient.
When to See a Doctor
Most acute coughs from colds or bronchitis do not need medical investigation. Clinical guidelines state that when the diagnosis is uncomplicated acute bronchitis, no lab tests, sputum analysis, chest X-rays, or antibiotics should be given.10PubMed Central. The diagnosis and treatment of acute cough in adults Antibiotics will not help a viral cough and carry their own risks.
You should seek medical attention if your cough lasts longer than three weeks, produces blood-tinged mucus, is accompanied by a high or persistent fever, or makes it difficult to breathe. Unintentional weight loss alongside a chronic cough is another red flag. A cough that worsens despite trying the remedies above, or one that started without any apparent cold, may point to asthma, reflux, a medication side effect (ACE inhibitors are a notorious culprit), or something that needs a chest image. In those situations, the fastest way to get rid of the cough is to identify and treat the underlying cause rather than layering on more home remedies.
Probiotics and Respiratory Infections
An emerging area of research links gut bacteria to respiratory health. A systematic review covering studies from 2010 to 2020 found that the incidence of respiratory symptoms including sore throat and cough was roughly 42% lower in groups taking probiotics compared with controls.25PubMed Central. The effect of probiotics on respiratory tract infection with special emphasis on COVID-19: Systemic review 2010–20 The duration of symptoms also tended to be shorter in the probiotic groups.
Before you rush to buy supplements, some caveats. Most of these studies used specific probiotic strains at specific doses over weeks or months. This is prevention territory, not a remedy you start after you are already coughing. And the research is still maturing; the effect sizes vary across studies and the optimal strains have not been definitively identified. That said, if you find yourself catching every bug that comes around and want to reduce the frequency and severity of future respiratory infections, daily probiotic intake is a low-risk strategy that the early evidence supports. It just will not help the cough you have right now.