Does Brandy Actually Help With a Cough?

No clinical trial has ever shown that brandy reduces coughing, and several lines of laboratory and human evidence suggest alcohol can actually make a cough worse. The belief that a nip of brandy soothes a tickly throat is centuries old and deeply embedded in folk medicine, but when researchers have looked at what ethanol does to the airways, the picture is not kind to the tradition. What probably does help in a classic brandy-based “hot toddy” is everything except the brandy itself: the hot water, the honey, and possibly the lemon.

What Alcohol Does to the Cough Reflex

The cough reflex is triggered when sensory nerve endings in the airway detect an irritant. One of the key receptors involved is called TRPV1, the same receptor that fires when you eat chili peppers. In guinea pig experiments, inhaled ethanol at concentrations that caused no cough on their own significantly amplified the cough response when TRPV1 receptors were stimulated. The researchers found that ethanol made coughing worse through a specific signaling pathway in the nerve cells, not through some general irritation of the airway lining.¹

This finding has a human parallel. In a study of patients who already had heightened airway sensitivity, pre-inhaling ethanol increased the cough response to capsaicin (a TRPV1 activator) in a dose-dependent fashion. Healthy controls did not show the same effect, which suggests that if your airways are already inflamed from a cold or bronchitis, alcohol exposure could amplify the urge to cough rather than suppress it.²

This is the opposite of what brandy’s reputation promises. If you are coughing because your throat is irritated by a virus, your sensory nerves are already primed. Introducing alcohol into that environment looks more like pouring fuel on a fire than putting it out.

The Airway Smooth Muscle Wrinkle

There is one laboratory finding that could explain why brandy feels soothing in the moment. Ethanol has been shown to relax airway smooth muscle cells in isolated tissue preparations. In cultured rat airway smooth muscle, brief ethanol exposure reversibly prevented the cells from contracting when stimulated, apparently by activating a relaxation pathway inside the cells.³ A separate study found that ethanol could produce roughly 40 percent relaxation in intact airway smooth muscle, though the relaxation was incomplete even at high concentrations.⁴

This sounds promising until you consider the gap between a petri dish and a person sipping brandy. The ethanol concentrations used in these experiments are far higher than what reaches your airway tissue after swallowing a drink. Blood alcohol after a glass of spirits might hit 0.05-0.08 percent; the lab studies used concentrations orders of magnitude above that. The smooth-muscle relaxation effect exists in a real sense, but at the concentrations your lungs actually encounter after a drink, it is unlikely to produce meaningful bronchodilation. Asthma inhalers work because they deliver a drug directly to the airway at therapeutic concentrations. Brandy reaches the airways only indirectly, diluted by the entire circulatory system.

Alcohol, Congestion, and Immune Function

Many coughs are driven by postnasal drip or nasal congestion, and here alcohol works against you. A study measuring nasal patency after drinking found that alcohol significantly increased nasal obstruction within two hours. Total nasal volume shrank, the narrowest part of the nasal passage got even narrower, and airway resistance went up. This happened in both regular drinkers and lighter drinkers.⁵ If congestion is feeding your cough, drinking brandy could make the underlying problem worse.

Alcohol also impairs the body’s ability to fight the infection causing the cough in the first place. It disrupts the mucus-driven clearance system that sweeps bacteria and debris out of the lungs, increases the risk of aspirating microbes from the throat into the lower airways, and suppresses both the fast-acting and slower-acting arms of the immune response.⁶ These effects are most pronounced with heavy or chronic drinking, but even moderate alcohol impairs mucociliary function to some degree. When you are already fighting a respiratory infection, anything that slows your body’s cleanup crew is unhelpful.

The Hot Toddy Trick: It Is Not the Brandy

A traditional hot toddy typically combines spirits, hot water, honey, and lemon. People who feel better after drinking one tend to credit the brandy, but the evidence points strongly toward the other ingredients.

Hot liquids on their own provide measurable relief. A randomized trial comparing a hot fruit-flavored drink to the same drink served at room temperature found that the hot version gave immediate and sustained relief from runny nose, cough, sneezing, sore throat, chilliness, and tiredness. The room-temperature drink also helped with runny nose, cough, and sneezing, but the hot version outperformed it on virtually every symptom.⁷ Separately, research has shown that ingesting hot fluids speeds up the movement of nasal mucus, helping clear congestion faster.⁸

So the warmth alone does real work. It promotes mucus drainage, soothes irritated tissue through local vasodilation, and may calm cough receptors through a combination of thermal and hydration effects. You would get the same benefit from hot water with lemon and honey, no spirits required.

Honey Is the Real Cough Remedy in the Glass

If brandy’s role in folk cough treatment is overstated, honey’s is arguably understated. A systematic review and meta-analysis pooling data from multiple trials found that honey reduced cough frequency and cough severity compared to usual care, with consistent results across studies.⁹

One well-known trial in children compared honey, dextromethorphan (the active ingredient in many over-the-counter cough syrups), and no treatment. Parents rated honey as providing the greatest improvement in cough frequency, cough severity, how bothersome the cough was, and the child’s sleep quality. Honey outperformed no treatment by a statistically significant margin for cough frequency and overall symptom score. Dextromethorphan, meanwhile, was not significantly better than no treatment for any outcome measured.¹⁰

A Cochrane systematic review reached a similar conclusion: honey probably reduces cough frequency better than both placebo and no treatment, and may be comparable to dextromethorphan. The benefit was most pronounced in the first three days. Beyond that, honey did not show a clear advantage over placebo for cough severity or sleep disruption.¹¹

The mechanism likely involves honey coating the throat and reducing irritation of the sensory nerve endings that trigger coughing. Honey is also slightly acidic and has mild antimicrobial properties, which may contribute. Whatever the exact pathway, the evidence is robust enough that multiple medical organizations now suggest honey as a first-line option for cough in children over one year old. (Honey should never be given to babies under twelve months due to the risk of infant botulism.)

The Placebo Effect Is Genuinely Powerful for Cough

One reason brandy “works” in so many personal anecdotes is that cough is unusually responsive to placebo. A review of cough studies found that the placebo effect is directly tied to a person’s belief in the treatment, and that this belief appears to influence the brain’s central control over the cough reflex itself. In other words, if you believe brandy will help your cough, your brain may actually dial down the urge to cough for a while.¹²

This is not a trivial effect. A randomized controlled trial on the common cold found that people who received pills (regardless of what was in them) had shorter and less severe illnesses than people who received no pills at all. Among participants who believed in the treatment and received pills, illnesses were substantially shorter and milder, whether or not the pills contained an active ingredient.¹³

Brandy arrives wrapped in centuries of cultural authority and a warm, comforting ritual. You hold a warm glass, the alcohol creates a burning sensation in the throat that feels like “something is happening,” and then your body enters a mild state of relaxation. All of these cues prime you to believe the remedy is working, and with cough, that belief genuinely reduces the symptom for a period of time. The problem is that the underlying mechanism is expectation, not pharmacology. You could get the same placebo boost from a strong herbal tea that you trusted would help, without the downsides of alcohol.

When Brandy Could Make a Cough Actively Worse

Beyond simply failing to help, there are situations where brandy is likely to worsen the cough it is supposed to treat:

• Inflamed airways: As the capsaicin studies showed, ethanol amplifies the cough response when airway sensory nerves are already sensitized. If you have a viral upper respiratory infection, your airways are by definition inflamed and hyper-reactive.
• Dehydration: Alcohol is a diuretic. Coughs tend to worsen when mucous membranes are dry and irritated. Losing fluid to alcohol metabolism while already running a mild fever is a recipe for thicker, stickier mucus that is harder to clear.
• Medication interactions: Many common cold remedies contain acetaminophen, antihistamines, or dextromethorphan. Combining any of these with alcohol increases the risk of liver damage, excess sedation, or dangerous central nervous system depression. Over-the-counter cough syrups often carry explicit warnings against alcohol use.
• Sleep disruption: While a small amount of alcohol may help you fall asleep initially, it consistently fragments sleep during the second half of the night. Quality sleep is one of the most reliable accelerators of recovery from respiratory infections, so trading it for a short-lived sedative effect is a bad bargain.

The congestion-worsening effect described earlier also matters here. Many nighttime coughs are driven by mucus draining from swollen nasal passages into the back of the throat. If alcohol increases nasal obstruction, it shifts more of that drainage toward the throat, potentially triggering more postnasal drip-related coughing exactly when you are trying to sleep.

What Actually Works for a Cough

Given the evidence, a sensible approach to a cough from a common cold or upper respiratory infection looks nothing like a brandy nightcap. Honey dissolved in hot water or tea provides the most evidence-backed symptomatic relief for adults and children over one year old. The warmth of the liquid does measurable work on its own, promoting mucus clearance and soothing irritated tissue. Staying well-hydrated keeps mucus thin and easier to move. Humidified air, especially at night, helps prevent the drying of airways that triggers coughing fits.

Over-the-counter cough suppressants containing dextromethorphan are widely used, but as the honey trials revealed, their performance in controlled studies is often no better than placebo or honey. Cough drops and throat lozenges stimulate saliva production and coat the throat temporarily, which provides the same kind of short-term relief that brandy is credited with, without the drawbacks. For coughs that persist beyond two or three weeks, or that produce colored mucus, blood, or fever, the answer is medical evaluation, not home remedies of any kind.

Why the Myth Persists

Brandy as cough medicine is one of those folk remedies that survives because the subjective experience is convincing even though the pharmacology is not. You take a sip of warm brandy with honey, and you immediately feel better. The warmth soothes your throat. The honey coats the irritated tissue. The alcohol creates a mild analgesic and sedative sensation. Your belief in the remedy activates the placebo response, which is genuinely powerful for cough. And you probably associate the ritual with being cared for, since someone likely made the drink and handed it to you.

Every one of those components does contribute something. The mistake is in attributing the benefit to the brandy rather than to the heat, the honey, and the psychology. Victorian-era physicians prescribed brandy for everything from heart failure to snakebites, and that medical authority still echoes in popular culture. But the pharmacological evidence on ethanol and cough points consistently in the wrong direction: sensitized cough reflexes, increased nasal congestion, impaired immune clearance, and disrupted sleep. If you enjoy the taste of brandy and want to add a small splash to your honey-and-hot-water before bed, the amount in a single drink probably will not cause measurable harm. But you should know that the brandy is the part of the recipe doing the least useful work, and possibly the only part working against you.