The best thing to take for a cough depends on the type of cough you have. A dry, tickling cough calls for a cough suppressant like dextromethorphan, while a wet cough with mucus responds better to an expectorant like guaifenesin. Knowing which one you’re dealing with is the first step to picking the right remedy.
Dry Cough vs. Wet Cough: Why It Matters
A dry cough produces no mucus. It often feels like a persistent tickle in the back of your throat and can be triggered by a cold’s aftermath, allergies, or irritants like dust or smoke. A wet (productive) cough brings up phlegm and typically signals that your body is trying to clear mucus from your airways, often during a chest cold or bronchitis.
These two types of cough need opposite approaches. Suppressing a wet cough can trap mucus in your lungs, potentially making things worse. Thinning mucus when you have a dry cough with nothing to clear won’t help either. Matching the remedy to the cough type is the single most important decision you can make at the pharmacy.
For a Dry Cough: Suppressants
Dextromethorphan is the most widely available over-the-counter cough suppressant. It works in the brain, turning down the signal that triggers the cough reflex. You’ll find it in products labeled “DM.” For adults and children 12 and older, a standard dose is 20 mg (two teaspoons of a typical syrup) every four hours, with no more than six doses in 24 hours.
Cough lozenges and thick syrups also help dry coughs through a simpler mechanism: they coat irritated nerve endings in the throat, creating a temporary soothing layer called a demulcent effect. The sugar content common to most cough drops and syrups contributes to this coating action. If your dry cough is mild, a lozenge may be enough on its own.
For a Wet Cough: Expectorants
Guaifenesin is the standard expectorant in over-the-counter products. It thins the mucus sitting in your chest, making it easier to cough up and clear out. This won’t stop your cough immediately, but it shortens how long you feel congested and reduces the heaviness in your chest. Drinking extra water alongside guaifenesin helps it work more effectively.
Many combination products pair guaifenesin with dextromethorphan. These can be useful if you have a mixed picture, like congestion during the day and a dry, hacking cough keeping you up at night. But if your cough is clearly productive, stick with the expectorant alone so your body can do its job of clearing mucus.
Honey: A Surprisingly Effective Option
Honey performs about as well as dextromethorphan for reducing cough frequency, based on a large Cochrane review of clinical trials. On a seven-point scale, honey reduced cough frequency by roughly 1.6 points more than a placebo and showed no meaningful difference from dextromethorphan. It also outperformed diphenhydramine, a common antihistamine found in some nighttime cough formulas.
A spoonful of honey before bed, or stirred into warm water or tea, coats the throat and appears to calm the cough reflex. The evidence is strongest in children, but adults report similar relief. One firm rule: never give honey to a child under one year old due to the risk of infant botulism.
Other Home Remedies That Help
Keeping your indoor humidity between 30% and 50% can ease coughing, especially at night. Dry air irritates already-inflamed airways, and a cool-mist humidifier in the bedroom addresses this directly. Clean the humidifier regularly to prevent mold growth, which would make a cough worse.
Warm liquids like broth, tea, or plain warm water soothe the throat and help thin mucus. Elevating your head with an extra pillow at night can reduce the postnasal drip that triggers coughing when you lie flat. A saltwater gargle (half a teaspoon of salt in a cup of warm water) temporarily reduces throat irritation for dry, scratchy coughs.
African geranium extract (sold under brand names like Umcka) has clinical evidence supporting its use for acute bronchitis. Meta-analyses show a significant decrease in bronchitis symptoms with its use, and it’s available as a liquid or chewable tablet at most pharmacies and health food stores.
What to Avoid Giving Children
The FDA does not recommend over-the-counter cough and cold medicines for children under 2, citing the risk of serious, potentially life-threatening side effects. Manufacturers go further, voluntarily labeling these products with “do not use in children under 4 years of age.” For young children, honey (for those over age 1), fluids, humidity, and nasal saline drops are the safest options.
When a Cough Needs More Than Home Treatment
A cough lasting eight weeks or longer in adults, or four weeks in children, is classified as chronic and warrants investigation. Coughs that persist this long can be driven by asthma, acid reflux, postnasal drip, or medication side effects, all of which need different treatment than a standard cold remedy.
Certain symptoms alongside a cough signal something more urgent: coughing up blood, significant shortness of breath, wheezing that wasn’t there before, or a cough that consistently disrupts your sleep or ability to work. These point toward conditions that over-the-counter products won’t address, and waiting them out with lozenges and honey won’t help.