What you should take for a cough depends on the type of cough you have. A dry, tickling cough calls for a suppressant that quiets the cough reflex, while a wet cough with mucus may respond better to an expectorant or a decongestant. Some coughs are best treated with honey, a nasal spray, or simply time. Here’s how to match the right remedy to your situation.
Dry Cough: Suppressants
A dry cough produces no mucus. It often feels like a persistent tickle in your throat or chest, and it tends to be worst at night. The goal with a dry cough is to turn down the cough reflex itself.
The most widely available over-the-counter option is dextromethorphan, listed as “DM” on many cough products. It works in the brain’s cough center, dulling the signal that triggers each cough. The standard adult dose is 10 to 20 mg every four hours or 30 mg every six to eight hours, up to 120 mg in a day. You’ll find it in products like Delsym and Robitussin DM. It won’t cure the underlying illness, but it can take the edge off enough to let you sleep or get through a workday.
If OTC options aren’t cutting it, doctors sometimes prescribe a capsule called benzonatate. Rather than acting in the brain, it numbs the stretch receptors in your airways, reducing the cough reflex at its source. One important safety note: these capsules must be swallowed whole. Chewing or dissolving them in your mouth can numb your throat rapidly, which may cause choking or a severe allergic reaction.
Wet Cough: Expectorants and Decongestants
A wet or “productive” cough brings up phlegm. The instinct is to reach for an expectorant like guaifenesin (found in Mucinex and many store brands), which is supposed to thin mucus so you can cough it out more easily. It’s the most popular OTC expectorant by far.
The evidence behind it, however, is surprisingly thin. A controlled study that measured actual mucus clearance from the lungs found no significant difference between a 1,200 mg dose of extended-release guaifenesin and a placebo in adults with acute respiratory infections. Mucus thickness and cough clearance rates were essentially the same in both groups. That doesn’t mean it can’t help you feel better subjectively, but you shouldn’t expect dramatic results.
When congestion is the root cause of your cough, a decongestant like pseudoephedrine (Sudafed) can be more useful. It shrinks swollen nasal membranes by constricting blood vessels, which dries out the tissues and reduces the postnasal drip that triggers many wet coughs. You’ll usually need to ask for it at the pharmacy counter since it’s kept behind the register in most states.
Cough From Allergies or Postnasal Drip
A cough that lingers for weeks without other cold symptoms is often caused by mucus dripping down the back of your throat. Allergies, sinus issues, and irritants can all trigger this pattern. The cough tends to be worse when lying down and may come with a scratchy throat or frequent throat clearing.
Antihistamines are the first line here. They block histamine, the chemical your body releases during allergic reactions that makes blood vessels leak and your nose run. Older antihistamines like diphenhydramine (Benadryl) or chlorpheniramine tend to work better for cough than newer ones like loratadine (Claritin) because their sedating, drying effects help suppress the drip itself.
A saline nasal rinse can also flush irritants and thin mucus in your nasal passages. If the cough persists, a steroid nasal spray reduces inflammation deeper in the sinuses, cutting mucus production over several days of use. Short-acting nasal decongestant sprays like oxymetazoline (Afrin) work quickly but should only be used for a day or two, since longer use can cause rebound congestion that makes things worse.
Honey: A Surprisingly Effective Option
Honey is not just a folk remedy. In a study of 105 children ages 2 to 18 with upper respiratory infections, a single bedtime dose of buckwheat honey reduced cough frequency and severity significantly better than no treatment, cutting cough severity by 47% compared to 25% with no treatment. Dextromethorphan, tested in the same study, was not statistically better than doing nothing. Honey and dextromethorphan performed about equally when compared head to head.
For adults, a spoonful of honey in warm water or tea before bed coats the throat and may calm irritation enough to improve sleep. It’s a reasonable first choice for a cough that’s mainly bothersome at night, especially if you’d rather avoid medication. One firm rule: never give honey to children under one year old due to the risk of botulism.
Herbal Remedies Worth Knowing About
Ivy leaf extract is one of the better-studied herbal cough treatments. In a clinical trial of patients with acute bronchitis, 55% of those taking ivy leaf extract alone were considered recovered by day seven, compared to 34% taking an ivy and thyme combination. Adverse events were rare and mild across all groups, with only about 2% of patients in the ivy group reporting any side effects. You can find ivy leaf syrups and lozenges in most pharmacies, often marketed for bronchial support.
What to Skip for Children
OTC cough and cold medicines carry real risks for young children. The FDA recommends against giving them to children under 2 because of the potential for serious, life-threatening side effects. Manufacturers have voluntarily extended that warning to children under 4. Homeopathic cough products aren’t a safer alternative for this age group either. The FDA has documented cases of children under 4 experiencing seizures, allergic reactions, difficulty breathing, and dangerous drops in blood sugar or potassium after taking homeopathic cough remedies.
For young children, honey (if they’re over age 1), cool-mist humidifiers, saline nose drops, and fluids remain the safest approaches.
How Long Is Too Long?
Most coughs from colds and upper respiratory infections clear up within three weeks. A cough that lasts eight weeks or longer in adults, or four weeks in children, is classified as chronic and needs medical evaluation. Common culprits behind a chronic cough include asthma, acid reflux, postnasal drip, and medication side effects, particularly from a class of blood pressure drugs called ACE inhibitors.
Seek prompt attention if your cough brings up blood, causes significant shortness of breath, or is accompanied by unexplained weight loss, high fever, or chest pain. These symptoms point to conditions that OTC remedies won’t address.