A dry cough without mucus responds well to a combination of throat-coating remedies and cough suppressants, depending on how long the cough has lasted and what’s causing it. For short-term relief, honey and menthol lozenges work surprisingly well. For persistent coughs, an over-the-counter cough suppressant or treating the underlying trigger is often the better path.
Honey: A Simple First Option
Honey is one of the most effective things you can reach for, and it doesn’t require a trip to the pharmacy. Multiple clinical trials have found that honey performs at least as well as standard OTC cough suppressants and, in some studies, outperforms them. In one trial of 160 children, a single dose of honey before bed reduced cough severity and frequency more than either of the two common cough-suppressing medications it was tested against. Another trial found an 84% therapeutic success rate for honey, matching the prescription and OTC drugs it was compared to.
A spoonful of honey on its own works, or you can stir it into warm water or milk. Buckwheat honey was used in several of these studies and may have a slight edge, but any variety helps. One important limit: never give honey to a child under 12 months old, because of the risk of infant botulism.
OTC Cough Suppressants
The most widely available OTC cough suppressant is dextromethorphan, labeled “DM” on most cough syrups and capsules. It works by dampening the cough reflex in the brain. A 30 mg dose produces a significant reduction in cough frequency compared to placebo, though it takes about two hours to reach full effect. So don’t expect instant relief.
If your cough is keeping you up at night, older antihistamines like diphenhydramine (the active ingredient in Benadryl) can help. They suppress cough partly through their drying, anticholinergic effects and partly because they make you drowsy, which can be a benefit at bedtime but a drawback during the day. Newer, non-drowsy antihistamines like fexofenadine (Allegra) and cetirizine (Zyrtec) do not effectively suppress cough. Their lack of sedation also means they lack the anticholinergic properties that make older antihistamines useful for cough.
Lozenges and Throat-Coating Remedies
A dry cough often feeds on itself: coughing irritates the throat, which triggers more coughing. Breaking that cycle is half the battle, and lozenges are a practical way to do it. Menthol lozenges act as a mild cough suppressant, while pectin-based lozenges work as a demulcent, coating and protecting irritated tissue. Many drops contain both. Let them dissolve slowly rather than chewing them for the longest relief.
Marshmallow root works on the same principle. The plant produces a thick, sap-like substance called mucilage that physically coats the lining of the throat. You can brew dried marshmallow root as a tea, steeping it for 5 to 10 minutes. For a stronger preparation, mix marshmallow root powder with room-temperature water and let it sit overnight in a covered jar. The result is a thick, slippery liquid that soothes the throat more effectively than hot tea alone.
Keep Your Air Humid
Dry air is one of the most common and overlooked triggers for a dry cough, especially in winter when heating systems pull moisture out of indoor air. A cool-mist humidifier in your bedroom can make a noticeable difference overnight. The Mayo Clinic recommends keeping indoor humidity between 30% and 50%. Going above 50% creates conditions for mold and dust mites, which can make coughing worse.
When the Cough Points to Something Else
A dry cough that lasts more than eight weeks is classified as chronic, and at that point, the cough itself is rarely the problem. It’s almost always a symptom of something else. The three most common culprits are acid reflux, post-nasal drip, and a sensitivity response in the airways (sometimes from a lingering infection, sometimes from asthma).
Acid reflux is a surprisingly common cause of chronic dry cough, even in people who don’t experience obvious heartburn. The reflux irritates the lower esophagus and throat, triggering a persistent cough. Treating the reflux with acid-reducing medications typically resolves the cough in most patients, though it can take several weeks of consistent treatment to see improvement.
Post-nasal drip from allergies or chronic sinusitis drips down the back of the throat and stimulates the cough reflex. For this type, older, first-generation antihistamines are the ones that work. The newer non-drowsy versions have been shown in multiple studies to be ineffective for cough caused by post-nasal drip.
Prescription Options
If OTC options aren’t cutting it, a doctor may prescribe benzonatate, which works differently from dextromethorphan. Instead of acting on the brain, it numbs the stretch receptors in the lungs that trigger the cough reflex. It’s essentially a local anesthetic for the airways. Codeine-containing cough syrups are still prescribed in some cases, but research has found codeine to be largely ineffective for cough caused by viral infections, and it comes with sedation and digestive side effects.
Cough Medicine and Children
The rules are different for kids. The FDA recommends against giving any OTC cough and cold medicines to children under 2 years old because of the risk of serious side effects. Manufacturers have voluntarily extended that warning to children under 4. Homeopathic cough products for young children have no proven benefits either. For children over 1 year old, honey before bed is a safer and well-supported alternative. For children under 1, a cool-mist humidifier and saline nasal drops are the main tools available.
Matching the Remedy to Your Situation
For a dry cough that started with a cold and has lasted less than three weeks, honey, lozenges, and dextromethorphan are your best bets. Use a humidifier at night, sip warm liquids throughout the day, and give your body time to recover.
For a cough lasting three to eight weeks (the “subacute” window), the same remedies still help with symptom relief, but if the cough isn’t improving at all, it’s worth looking into whether reflux, allergies, or a post-infection sensitivity is keeping it going. A cough that persists beyond eight weeks, or one accompanied by fever, unexplained weight loss, or night sweats, warrants a medical evaluation to identify the underlying cause rather than just treating the symptom.