Strepsils are medicated lozenges designed to relieve sore throat pain and fight the bacteria, fungi, and viruses that can cause throat infections. They’re one of the most widely sold over-the-counter throat remedies in the world, available in dozens of countries without a prescription. Each lozenge dissolves slowly in your mouth, delivering two antiseptic ingredients directly to the inflamed tissue in your throat.
Active Ingredients and How They Work
The standard Strepsils lozenge contains two antiseptic compounds: amylmetacresol (0.6 mg) and 2,4-dichlorobenzyl alcohol (1.2 mg). These ingredients have antibacterial, antifungal, and antiviral properties, meaning they target multiple types of organisms that commonly cause sore throats.
What makes the combination effective is that the two ingredients work together synergistically. Their combined antibacterial action is stronger than either ingredient alone, which is why the doses can be kept relatively low. Beyond killing germs, both compounds also block certain ion channels in nerve cells in a way that’s similar to local anaesthetics. This is why a Strepsils lozenge creates a mild numbing sensation in your throat as it dissolves, providing some immediate comfort on top of the antiseptic effect.
How Quickly They Work
A Strepsils lozenge takes roughly 5 to 12 minutes to dissolve fully. You can feel a soothing and coating effect on the throat within about 2 minutes of starting to suck on one. A noticeable reduction in throat soreness typically follows within 15 minutes, while more significant pain relief and a reduction in throat swelling tend to kick in around the 30-minute mark. The effects of a single lozenge can last up to 3 hours.
Strepsils also makes a stronger “Intensive” version containing flurbiprofen (8.75 mg), which is an anti-inflammatory painkiller rather than just an antiseptic. That version begins reducing pain from around 22 minutes and reaches peak effect at about 70 minutes, with relief lasting up to 4 hours. It’s a better choice for more painful, swollen sore throats, though it works differently from the original formula.
Dosage and Who Can Use Them
Adults can take one lozenge every 2 to 3 hours, up to a maximum of 12 lozenges in 24 hours. Children over 6 years old follow the same dosage. Children under 6 should not use Strepsils at all, both because the product hasn’t been approved for that age group and because young children can choke on lozenges.
You should let the lozenge dissolve slowly in your mouth rather than chewing or swallowing it. The whole point is prolonged contact between the active ingredients and your throat tissue, so rushing the process reduces the benefit.
Available Varieties
Strepsils comes in a wide range of flavors and formulations. The original version has a slightly medicinal taste, while options like honey and lemon or strawberry are more palatable. Beyond flavor, the key distinction is between standard, sugar-free, and intensive varieties.
Sugar-free Strepsils use isomalt, maltitol syrup, and saccharin sodium as sweeteners instead of sugar. These are common sugar substitutes found in many sugar-free products. One thing to be aware of: isomalt and maltitol can have a mild laxative effect if you take several lozenges throughout the day. People with a rare hereditary condition called fructose intolerance should avoid the sugar-free versions entirely.
Side Effects and Precautions
Most people tolerate Strepsils without any problems. The most notable risk is an allergic reaction, which can show up as itching, a burning sensation in the mouth, difficulty breathing, swelling of the face, neck, tongue, or throat, or a rash. If any of these happen, stop taking the lozenge immediately. Taking more than the recommended number of lozenges may cause stomach discomfort, but serious overdose effects are uncommon.
Some Strepsils varieties contain sulphites (specifically sulphur dioxide, listed as E220, present in the liquid glucose). Sulphites can rarely trigger severe hypersensitivity reactions including bronchospasm, which is a sudden tightening of the airways. This is most relevant for people who already know they’re sensitive to sulphites, a group that overlaps significantly with people who have asthma.
What Strepsils Don’t Do
Strepsils treat symptoms. They won’t cure a bacterial throat infection like strep throat, which requires antibiotics. They’re best suited for the everyday sore throats that accompany colds and mild upper respiratory infections, where the goal is to manage discomfort while your immune system handles the underlying cause. If your sore throat is severe, lasts more than a few days, comes with a high fever, or makes it very difficult to swallow, that’s a situation that needs medical attention rather than lozenges alone.