Cold and Flu Remedies That Actually Work in 2026: Six Pharmacy Staples Versus the Trials, the Lemsip Ingredient America Is Binning – and the Salt Water Fix That Cut Colds by Two Days
Somewhere in Britain this week, someone with a streaming nose will hand over six quid for a box of Lemsip Max, and only one of the two drugs inside it will do anything. The paracetamol works. But the decongestant, phenylephrine, is a drug the American regulator has formally proposed pulling from every oral cold product in the country because it doesn’t beat a placebo. It’s still in most of the sachets at Boots.
In This Article
- First, the blocked nose: the Lemsip ingredient America is binning
- The cough: honey, a Cochrane shrug and the medicines that quietly disappeared
- Cold and flu remedies that actually work for a sore throat
- Aches, fever and the 39p box the £6 sachet is hiding
- The salt water fix that shortened colds by two days
- First Defence, zinc and the shelf of maybes
- What actually goes in the basket this autumn
That’s the awkward starting point for any honest look at cold and flu remedies that actually work. Late September is when rhinovirus does its annual lap of the nation’s classrooms and open-plan offices, and the cold and flu aisle is about to have its busiest fortnight since March. Some of what’s on it is properly useful. A lot of it is paracetamol in a costume. And the two interventions with the best recent trial data, one of which costs about 2p, aren’t sold in the aisle at all.
First, the blocked nose: the Lemsip ingredient America is binning
Phenylephrine ended up in nearly everything by accident of policy rather than pharmacology. Until 2008 the standard oral decongestant in Britain was pseudoephedrine, which works, but which can also be cooked into methamphetamine, so the government moved it behind the pharmacy counter and capped how much you can buy in one go (720mg, which in practice means a single pack). Manufacturers needed something they could keep on the open shelf and in the supermarket. Phenylephrine was the something. Lemsip, Beechams, the shelf versions of Sudafed and several Benylin products all switched.
The problem is what happens when you swallow it. Phenylephrine gets broken down by the gut wall and liver before it reaches the bloodstream (first-pass metabolism, in the jargon) and very little arrives at the swollen blood vessels in your nose that it’s supposed to be shrinking. Three larger, better-run trials published since 2016 found no difference between phenylephrine tablets and sugar pills for congestion. In September 2023 an FDA advisory committee voted 16-0 that the oral form isn’t effective, and in November 2024 the agency published a proposed order to strip it out of over-the-counter cold medicines altogether. The public comment period closed in May 2025 and a final order has been expected ever since. Whatever the eventual paperwork says, the science has been settled for a while.
The MHRA’s response, when the story crossed the Atlantic, was a statement that there were “no new safety concerns” and people could carry on using the products as directed. Which is true, and beside the point. Nobody said phenylephrine was dangerous. The complaint is that you’re paying for it. Dr Hisham Al-Obaidi, a pharmacy lecturer at the University of Reading who also works as an advanced pharmacist practitioner for the London Ambulance Service, wrote last winter that continuing to sell it risks the public’s trust in over-the-counter medicines generally, because people assume the stuff on the shelf has been shown to work, not merely shown not to hurt.
So what does clear a blocked nose? Two things, and neither is in the sachet.
Pseudoephedrine, the drug phenylephrine replaced, is still sold in Britain. You have to ask the pharmacist for it by name and it comes from behind the counter, usually as 60mg tablets. It reaches the nose intact and the trials show it opens things up. It isn’t for everyone: it raises blood pressure and heart rate, and in early 2024 the MHRA added warnings about two rare but serious brain blood-vessel conditions (PRES and RCVS) and told people with severe or uncontrolled hypertension or severe kidney disease to avoid it. If you’re on blood pressure tablets, leave it.
The other option is a decongestant nasal spray, meaning xylometazoline or oxymetazoline, sold as Otrivine, Vicks Sinex and various own-brands for about four pounds. Sprayed rather than swallowed, the drug lands directly on the nasal lining and the effect arrives within minutes. The catch is well known and real: use it for more than about a week and the lining becomes dependent on it, leaving you more blocked than when you started. Three nights for the worst of it, then stop. And for what it’s worth, phenylephrine itself works fine as a spray. It was only ever the tablet that was the problem.
The cough: honey, a Cochrane shrug and the medicines that quietly disappeared
The cough medicine shelf has changed more in the last three years than in the previous thirty, and almost nobody noticed. In March 2023 the MHRA pulled every product containing pholcodine, the ingredient in a lot of “dry tickly cough” syrups, after studies linked it to a rare but severe allergic reaction to muscle relaxants used in general anaesthesia. Then in early 2024 codeine linctus, the strong stuff your nan swore by, was made prescription-only because of addiction. What’s left on the open shelf is mostly glycerol-and-honey syrups, guaifenesin (an expectorant, sold as “chesty cough” mixtures) and dextromethorphan, a mild suppressant.
And the honest verdict on that remaining shelf is a shrug. The most recent Cochrane review of over-the-counter cough medicines pooled 29 trials and 4,835 people and concluded there’s no good evidence for or against any of them. Not “they’re harmful”, just that nobody has shown they do much. When NICE wrote its guideline on acute cough in 2019 it went through the same evidence and produced a short list of things people “may wish to try” on the strength of limited evidence: honey for anyone over one year old, the herbal remedy pelargonium for over-12s, and guaifenesin. Dextromethorphan, in the one decent trial NICE found, did no better than placebo on cough frequency or severity.
Honey is the interesting one. A 2020 Oxford meta-analysis in BMJ Evidence-Based Medicine gathered 14 randomised trials and found honey beat usual care on both combined symptom scores and cough frequency, with the authors pointing out that it’s cheap, everywhere, and doesn’t feed antibiotic resistance. The trials are small and most were in children, so don’t expect miracles. But a spoonful of honey in hot water did at least as well as anything in a brown bottle costing seven pounds, and a jar from Aldi is about £1.50. Never for babies under one; infant botulism is rare but it’s real.
My position: unless you’ve got a chesty, productive cough and fancy trying guaifenesin, don’t buy cough medicine. Buy honey, drink more than you think you need, and accept that the cough is always the last symptom to leave. NHS guidance is that a post-viral cough can rumble on for three weeks and doesn’t need a doctor unless it’s still there after that, or you’re coughing blood, or breathless, or feverish for days on end.
Cold and flu remedies that actually work for a sore throat
Here the picture is better, because a sore throat is one of the few cold symptoms where a specific over-the-counter drug has decent trial data behind it. Flurbiprofen lozenges (Strefen is the brand, 8.75mg each, a bit under a fiver for 16) are an anti-inflammatory delivered straight to the tissue, and placebo-controlled trials show measurable pain relief within about a quarter of an hour that holds for three or four hours.
They’re the one throat product I’d pay full price for.
Standard Strepsils and their supermarket clones are, functionally, boiled sweets with a weak antiseptic in them. Sucking makes saliva, saliva soothes, and that’s most of the effect; a bag of Werther’s Originals does a similar job for a third of the price. The versions with a local anaesthetic (look for hexylresorcinol, benzocaine or lidocaine on the pack) numb the throat for a while and are a fair buy if swallowing is the main misery. So is the old salt-water gargle, which costs nothing and sits on the NHS’s own sore throat page.
Paracetamol or ibuprofen for the pain, obviously. And if the throat is very bad, with white spots, swollen glands, a high temperature and no cough, you no longer need a GP appointment in England to be assessed for a bacterial infection. Since January 2024 pharmacies under the Pharmacy First scheme can score your symptoms and supply antibiotics where the score justifies it. Most sore throats are viral and won’t get them, which is the right outcome. The scheme exists to catch the minority that are streptococcal.
Aches, fever and the 39p box the £6 sachet is hiding
Now the paracetamol maths, because it’s the bit that ought to annoy you. A sachet of Lemsip Max Cold & Flu contains 1,000mg of paracetamol and 12.2mg of phenylephrine: two ordinary paracetamol tablets and a decongestant we’ve already dealt with. Ten sachets cost between £5 and £6 depending on where you shop, so 50p to 60p a dose. A 16-pack of supermarket own-brand paracetamol costs under 50p, or about 6p for the same 1,000mg. You’re paying the best part of ten times over for lemon flavouring, a paper sachet and a decongestant that doesn’t do anything.
I’ll concede the ritual has value. A hot, sweet, lemony drink when you feel wretched is comforting, and comfort matters when you’re ill. But you can build the same drink for pennies: two paracetamol swallowed with a mug of hot water, honey and a squeeze of lemon. Same drug, same warmth, same steam up the nose. The only thing missing is the branding.
On which painkiller to choose, the biggest British trial was run from Southampton and published in the BMJ in 2013. Just under 900 people who’d turned up at their GP with a respiratory infection were randomised to paracetamol, ibuprofen or both, taken regularly or only when needed, with or without steam inhalation. Ibuprofen was no better than paracetamol for symptoms. Taking tablets on a schedule rather than as needed made no difference. Steam inhalation, the towel-over-the-bowl thing, did nothing measurable, and about 2% of the people who tried it gave themselves a mild scald. Oddest of all, the people told to take ibuprofen were 50% to 70% more likely to come back within a month with new or worsening symptoms, which the lead researcher, Professor Paul Little, thought might be the anti-inflammatory interfering with the immune response. Paracetamol first, then, with ibuprofen as a top-up if you tolerate it, and no need to set an alarm for the next dose.
The one genuine danger in the whole aisle is stacking. Day capsules, night capsules, a hot drink, an “all in one” tablet and a couple of plain paracetamol for luck can push you past the 4g daily limit without anyone noticing, because the paracetamol is hidden behind brand names. If you’ve taken a combination product, that’s your paracetamol for that slot. Don’t top it up.
The salt water fix that shortened colds by two days
Now for the thing the aisle can’t sell you. In September 2024 a team from the University of Edinburgh presented results from a trial called ELVIS-Kids at the European Respiratory Society congress. They’d randomised 407 children under seven; when 301 of them went on to catch a cold, half got standard care and half had parents who’d been shown how to make salt-water nose drops from sea salt and boiled, cooled water, three drops per nostril at least four times a day. The salt-water children were better in six days rather than eight. And fewer people in their households caught the cold afterwards: 41% against 58%.
That echoed a smaller adult pilot from the same Edinburgh group, published in 2019, where hypertonic saline nasal irrigation plus gargling cut the length of a cold by nearly two days, reduced the amount of over-the-counter medicine people bought by about a third, and cut spread within the household by a similar margin. The proposed mechanism is rather elegant. Cells lining the nose use chloride from the salt to make hypochlorous acid, the same antiviral compound found in bleach, in tiny local doses.
Neither trial is enormous and the adult one especially was small. But the intervention costs about 2p, has no real downside provided you use boiled-and-cooled water rather than straight from the tap, and has better recent trial evidence behind it than anything with a brand name on it. The NHS carries instructions for a home-made saline rinse on its sinusitis page; the ELVIS recipe is a bit saltier than the standard one. Either beats a sachet.
First Defence, zinc and the shelf of maybes
Two more products will be pushed at you this autumn. Vicks First Defence, the nasal spray you’re meant to fire at the first tickle, is a microgel designed to trap the virus in the nose before it gets going; the trial evidence is thin and largely manufacturer-funded, and I’ve never met a pharmacist who recommends it unprompted. Zinc lozenges are a more interesting case. A 2024 Cochrane review of eight trials and 972 people found they might shorten a cold by around two days, but rated its own confidence in that finding as low, and the lozenges taste of coins and can make you feel sick. If you want to try them, start within a day of symptoms and stop when you’re better. They’re not a daily supplement.
Vitamin C, echinacea and the rest of the fizzing-orange economy we went through properly a few weeks ago in our audit of immune-boosting supplements, and the verdict hasn’t moved. Don’t bother, unless you run marathons.
What actually goes in the basket this autumn
Own-brand paracetamol, 39p to 49p. Ibuprofen if your stomach and kidneys are fine with it. A xylometazoline spray for the worst two or three nights, or a pack of pseudoephedrine from behind the counter if your blood pressure is normal. A tub of table salt and a jar of honey, both of which you probably already own. Flurbiprofen lozenges if the throat is the main event. That’s a complete cold kit for under £15, and every item in it has more evidence than the £6 sachet.
What none of it does is stop you catching the cold in the first place, and that’s where the real gains are. The flu jab, if you’re eligible, is the single most effective thing in this whole conversation. Washing your hands works, tedious as that is to hear. Sleep matters more than any lozenge: in a 2015 study that deliberately squirted rhinovirus up volunteers’ noses, those sleeping under six hours a night were about four times as likely to develop a cold as those getting seven or more. And from October the NHS advises everyone in Britain to take vitamin D, not because it’ll stop you catching a cold (the trial evidence on that is unimpressive) but because you won’t be making any of your own until March.
When should you stop self-treating? The NHS list is short: symptoms that haven’t improved after three weeks, a temperature that won’t come down, chest pain, coughing blood, or breathlessness. Very young babies, people over 65 and anyone with a long-term heart or lung condition should have a lower threshold, and for most of them Pharmacy First or 111 is the right first call rather than A&E. If you’re feeling rough enough to be losing fluids, our piece on electrolyte powders covers the one situation where they’re worth the money, and being ill is it.
So a question for the week the sniffles arrive. Which cold remedy will you keep buying regardless of what the trials say, and what’s the ritual it’s really standing in for?
