The common cold has no cure. Most people get over one in about a week, with or without anything from the pharmacy. But “no cure” does not mean “nothing works.” A few things genuinely shorten the illness or make you more comfortable; a great deal of what sells best does nothing at all; and a handful of popular habits carry real risk.
I have spent seventeen years behind a hospital pharmacy counter, and this page is the conversation I end up having every autumn, written down in one place. One note before we start: I can’t diagnose you, and nothing here replaces seeing a clinician. What it can do is make sure you know what you’re buying before you reach the checkout.
The short answer
Nothing on the shelf stops a cold in its tracks. Zinc lozenges started as soon as symptoms begin may shorten the illness by about two days, though the evidence behind that is low-certainty — if you use the right dose and the right form. Honey eases a night cough in children over one. Saline rinses clear a blocked nose without drugs. Rest and fluids do more good than most supplements. And vitamin C, echinacea and antibiotics — the three things I’m asked for most — do not deliver what people expect of them.
Cold season at a glance
| ✅ Supported by evidence | ⚠️ Weak or no meaningful evidence | 🚫 Avoid |
|---|---|---|
| Zinc lozenges — started as soon as symptoms begin, 75–80 mg elemental zinc a day, dissolved slowly in the mouth (adult evidence) | Routine vitamin C to prevent colds (no effect); vitamin C started after symptoms begin (little to none) | Zinc nasal sprays (risk of permanent loss of smell) |
| Honey for night cough in children over 1 | Echinacea (weak evidence; possible rash in children) | Taking prescription antibiotics on your own |
| Saline nasal rinses — adults and children | Antibiotics for a cold (no effect on viruses) | Aspirin in children (Reye’s syndrome) |
| Rest and fluids | “Immune booster” blends | Honey under 1 year of age (botulism risk) |
| Symptom relief — acetaminophen or ibuprofen (children dosed by body weight) |
Evidence behind the table: zinc — Cochrane review (Nault et al., 2024); vitamin C — Cochrane (Hemilä & Chalker, 2013); echinacea — Cochrane (Karsch-Völk et al., 2014) and NCCIH; antibiotics — Cochrane (Kenealy & Arroll, 2013); honey — Cochrane (Oduwole et al., 2018). Full citations at the end of this page.
What holds up
Zinc — the strongest of the bunch, with conditions attached
The trials that showed a benefit gave zinc as soon as symptoms began, at 75–80 mg of elemental zinc per day, as a lozenge that dissolves slowly in the mouth. Miss any one of those three conditions and the effect usually slips away. Swallowed tablets don’t do it. Nasal sprays should be avoided — they carry a risk of permanently losing your sense of smell. Expect nausea or a metallic taste in some people; that is the trade-off. Even then, the Cochrane review rates this as low-certainty evidence — the benefit is modest and not guaranteed. Children need different doses and formulations, so ask a clinician or pharmacist before starting.
Honey — cheap, old, and actually supported
Trials in children show honey eases night cough better than a placebo, and in some studies better than a common cough syrup. One warning that matters: never give honey to a baby under twelve months — the botulism risk is real. For children over one and for adults, a small spoon at bedtime is a reasonable thing to try.
Saline nasal rinses — the underrated one
Saline clears congestion in both adults and children without any drug at all. It’s inexpensive, it can be used as often as you need, and it doesn’t interact with anything. Use a proper rinse bottle or squeeze bottle, and keep the water clean — use distilled, sterile, or previously boiled water.
Rest and fluids — not a throwaway line
For an infection your body will clear on its own, time and sleep are the closest thing to a treatment you have. Your immune system is doing the work. Staying up late hunting for a stronger product works against you.
Symptom relief, done properly
Fever, headache and body aches respond to acetaminophen or ibuprofen. The mistake I see most often is double-dosing: many combination cold products already contain acetaminophen, and people add a separate tablet on top without reading the label. Dosing for children is by body weight, not age alone — read the package or ask a pharmacist or doctor before you give it. For a blocked nose, start with saline; if you use a decongestant spray, keep it to three days at most. When in doubt, ask.
What doesn’t hold up
Vitamin C — the most misunderstood item on the shelf
Taken routinely by ordinary people, it does not prevent colds. Started after symptoms appear, it does essentially nothing. The only thin thread of evidence is that people who take it every single day long-term may shorten a cold by about 8 percent — a difference too small to be worth the habit. Eat the oranges. Skip the fantasy.
If you’re weighing zinc against vitamin C, I’ve compared them here: Zinc vs Vitamin C for Colds: What Pharmacists Actually Recommend.
Echinacea — possibly a little, but weakly
The 2014 Cochrane review put it this way: some preparations may do slightly better than placebo, but the clinical evidence is weak, and for prevention the trend was positive but not statistically significant. The U.S. NCCIH reaches a similar place — preparations vary too much to promise a reliable effect. And vary they do: what’s in the bottle depends on the species, the plant part, and the extraction. If you’re allergic to the daisy family, avoid it. In children it may increase the risk of rash, and it isn’t something to start for a child on your own. The NCCIH says echinacea is likely safe for most adults for short periods of time; long-term continuous use hasn’t been well studied. I wrote a full breakdown here: Does Echinacea Work for Colds?
Antibiotics — the most common and the most dangerous mistake
A cold is viral. Antibiotics only work on bacteria. Yellow or green phlegm is not proof of a bacterial infection — that color comes from your own immune cells, and viral colds produce it too. Using antibiotics when they aren’t needed costs you three ways: it feeds resistance, it damages your gut bacteria, and it exposes you to allergy and side-effect risk. The worst part is that when you genuinely need these drugs later, they may no longer work. I’ve broken down when antibiotics really are warranted — and why a doctor sometimes writes a prescription under pressure — in Can You Take Antibiotics for a Cold?
When you need to see a doctor instead
Rarely, a cold opens the door to a secondary bacterial infection. These are the signs to stop self-treating and get assessed:
- Symptoms that keep getting worse after more than ten days
- A clear improvement, then a sudden new fever and a worse cough (a biphasic course — a classic clue to a secondary bacterial infection)
- Persistent high fever, ear pain, or shortness of breath
If any of these apply, you need a clinician’s assessment — not a leftover antibiotic from last winter. Antibiotics also have a legitimate role in confirmed strep throat or purulent tonsillitis, but viral and bacterial sore throats look nearly identical from the outside. Telling them apart takes a test, and that call belongs to your doctor.
The pharmacist’s cold-season shelf
Worth keeping at home: zinc lozenges, saline rinse, honey (for anyone over one year old), and a basic pain and fever reliever.
You can skip: vitamin C effervescent tablets (fine if you enjoy them, just don’t expect results), “immune booster” blends, and echinacea unless you specifically want to try a labeled preparation.
Never: take antibiotics on your own, use zinc nasal spray, or give a child an adult dose.
A closing thought from the counter
Every season I watch people spend real money on the loudest product on the shelf and walk past the cheap one that has the evidence. Cold season isn’t a test of how much you can buy. It’s a test of knowing when to treat the symptoms, when to wait, and when to see someone. If you’re unsure which of those applies to you right now, that is exactly what a pharmacist is for.
This page is reviewed and updated each cold season.
Disclaimer: This is general health education, not personalized medical advice. It cannot diagnose illness and does not replace an in-person consultation. If you have a persistent fever, worsening symptoms, or an existing chronic condition, please see a healthcare provider. Antibiotic use should always be decided by a clinician after assessment. If you’re pregnant or breastfeeding, check with your clinician before taking anything new.
Sources
- Nault D, Machingo TA, Shipper AG, et al. Zinc for prevention and treatment of the common cold. Cochrane Database of Systematic Reviews, 2024, Issue 5: CD014914.
- Hemilä H, Chalker E. Vitamin C for preventing and treating the common cold. Cochrane Database of Systematic Reviews, 2013, Issue 1: CD000980.
- Karsch-Völk M, Barrett B, Kiefer D, et al. Echinacea for preventing and treating the common cold. Cochrane Database of Systematic Reviews, 2014, Issue 2: CD000530.
- Kenealy T, Arroll B. Antibiotics for the common cold and acute purulent rhinitis. Cochrane Database of Systematic Reviews, 2013, Issue 6: CD000247.
- Oduwole O, Udoh EE, Oyo-Ita A, Meremikwu MM. Honey for acute cough in children. Cochrane Database of Systematic Reviews, 2018, Issue 4: CD007094.
- National Center for Complementary and Integrative Health (NCCIH), NIH. Echinacea: Usefulness and Safety; and The Common Cold and Complementary Health Approaches.
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