Cold and Flu Tablets – UK Guide to Ingredients and Safety

When a cold or flu hits, reaching for a tablet is often the first instinct. But with dozens of products on shelves at Boots, ASDA, Tesco, and pharmacies across the UK, knowing which one to choose—and how to take it safely—is not always straightforward. Many contain paracetamol, which carries a strict daily limit, while others add decongestants, caffeine, or sedating antihistamines. The difference between a day and a night tablet matters more than most people realise, especially when planning sleep or work. This guide examines the common ingredients, recommended dosages, alcohol interactions, and availability of the most popular cold and flu tablets in the UK, using official patient information and medical sources from the NHS cold and flu page and the electronic Medicines Compendium.

Most cold and flu tablets sold in the UK are multi-symptom remedies. They aim to tackle fever, headache, body aches, nasal congestion, and sometimes cough or sore throat in a single dose. However, the combination of active ingredients means that users must be careful not to double up on paracetamol from other medications. The same warning applies to alcohol, which can significantly increase the risk of liver damage when taken alongside paracetamol-based products. According to patient information leaflets from the UK’s electronic Medicines Compendium (emc), products like Max Strength Cold & Flu Relief Day & Night Capsules explicitly state that patients should not drink alcohol while taking the medication.

What cold and flu tablets are available at major UK retailers?

Across the UK, the three largest retailers for over-the-counter cold and flu tablets are Boots, ASDA, and Tesco. Each stocks a mix of branded products like Beechams, Lemsip, and Benylin, as well as their own generic equivalents. Prices typically range from £3 to £6 per pack, making them widely affordable. Availability is consistent across all three, though own-brand formulations may vary slightly in packaging and price.

Key insights at a glance

• Most cold and flu tablets contain paracetamol for pain and fever relief, with added decongestants and in night versions, sedating antihistamines.
• Day tablets do not contain sedating ingredients; night tablets include antihistamines like promethazine or diphenhydramine to promote sleep.
• Alcohol must be avoided while taking paracetamol-based cold and flu tablets due to the risk of liver damage.
• Dosage for adults generally follows the paracetamol limit of a maximum of 4 grams per day, regardless of the brand.
• Own-brand tablets from Boots, ASDA, and Tesco offer identical active ingredients to branded versions at a lower price.
• Ibuprofen-based tablets may be more suitable for those with inflammatory symptoms but are not recommended for everyone.

Cold and Flu Tablets: Key Facts at a Glance

What are the key ingredients in cold and flu tablets and how do day and night versions differ?

The difference between day and night cold and flu tablets centres on whether the formulation includes a sedating antihistamine. Day versions typically combine paracetamol with a decongestant like phenylephrine and sometimes caffeine to maintain alertness. Night versions replace or supplement the caffeine with a sedating antihistamine such as promethazine or diphenhydramine to help users sleep despite their symptoms.

For example, the widely available Max Strength Cold & Flu Relief Day & Night Capsules (often found at Boots, ASDA, and Tesco) contain in their day capsules: 500 mg of paracetamol, 6.1 mg of phenylephrine hydrochloride, and 25 mg of caffeine per capsule. The night capsules contain 500 mg of paracetamol and 6.1 mg of phenylephrine hydrochloride, without the caffeine, to avoid interference with sleep. This pattern is typical across most branded and own-brand products.

Do cold and flu tablets contain paracetamol or ibuprofen?

Most multi-symptom cold and flu tablets in the UK are paracetamol-based. Ibuprofen is also available as a single-ingredient painkiller but less commonly appears in combination cold and flu products. The NHS recommends paracetamol as a first-line treatment for fever and mild pain, while ibuprofen is better suited for inflammatory symptoms. It is important to check the label: some products contain both, but most stick to one.

What is the correct dosage for cold and flu tablets?

Dosage instructions vary slightly between brands, but the core rule is consistent: for paracetamol-containing tablets, adults and children aged 12 and over should not exceed 4 grams (eight 500 mg tablets) in 24 hours. The standard recommendation is two tablets every four to six hours as needed, with a maximum of eight tablets per day for day formulations.

For night formulations, the typical advice is two capsules at bedtime only, not to be repeated within the same 24-hour period. The Max Strength Cold & Flu Relief Day & Night Capsules patient leaflet, for instance, specifies: “Do not take anything else containing paracetamol” and warns that overdosing can lead to metabolic acidosis requiring urgent treatment.

It is also important to consider that some products, such as Beechams All-In-One hot lemon sachets, contain 1000 mg of paracetamol per sachet, meaning the maximum daily dose is four sachets rather than the eight tablets of a 500 mg product. Users must read each product’s instructions carefully.

Can I take cold and flu tablets with alcohol?

All major sources—including the NHS alcohol advice page, medicines.org.uk, and the U.S. National Institute on Alcohol Abuse and Alcoholism (NIAAA)—advise against consuming alcohol while taking cold and flu tablets, particularly those containing paracetamol. The risk is liver damage, as both alcohol and paracetamol are processed by the liver. The combination can be harmful even at moderate doses of paracetamol (2-4 grams per day) when alcohol is present.

Beyond liver concerns, mixing alcohol with cold and flu tablets can amplify side effects. Decongestants like phenylephrine may cause dizziness and blood pressure changes. Caffeine in day-tablets can mask the sedative effects of alcohol, leading to overconsumption. Sedating antihistamines in night tablets can cause severe drowsiness, dizziness, and impaired coordination when combined with alcohol. The NIAAA explicitly warns that cough syrups and laxatives may themselves contain up to 10% alcohol.

What are Beechams cold and flu tablets and how do they compare?

Beechams is one of the most recognisable brands in the UK cold and flu market, owned by GSK. Their product range includes hot lemon sachets, tablets, and capsules. The Beechams All-In-One formula, available both as a hot drink and in tablet form, contains 1000 mg of paracetamol, 6.1 mg of phenylephrine, and guaifenesin as an expectorant. The Flu Plus range comes in day and night capsules identical in composition to the generic Max Strength product described earlier.

Beechams Nightcap is a night-only product that contains paracetamol and promethazine, a sedating antihistamine. This formulation is intended for use at bedtime to relieve symptoms while aiding sleep. Compared to own-brand products at Boots or Tesco, Beechams commands a slightly higher price, though the active ingredients are identical. The choice often comes down to brand preference or speciality formulations like hot drinks versus tablets.

Timeline of cold and flu symptom relief and tablet action

1. 0-30 minutes: Onset of relief for pain and fever from paracetamol or ibuprofen.
2. 1-2 hours: Peak effect of decongestants and antihistamines, including nasal decongestion and reduced sneezing.
3. 4-6 hours: Re-dose interval for most products (depending on the specific active ingredient and formulation).
4. 24-48 hours: Expected duration of treatment for acute symptoms; most colds resolve within this window with symptom management.
5. 7 days: Maximum recommended use without medical advice; persistent symptoms should be evaluated by a healthcare professional.

What is certain and what remains uncertain about cold and flu tablets?

Why understanding cold and flu tablet ingredients matters

Cold and flu tablets are designed as multi-symptom remedies, but the convenience of a single product can also mean taking ingredients you do not necessarily need. For instance, a tablet that combines paracetamol with a decongestant and caffeine may be unnecessary if your only symptom is a fever. Similarly, someone with high blood pressure should be cautious about decongestants that can raise blood pressure temporarily. For further details on managing cold and flu symptoms, you can explore information on the Frankie Goes To Hollywood singer illness.

Paracetamol-based tablets are generally safer for those with stomach issues, while ibuprofen can be better for inflammation. The addition of decongestants like phenylephrine, however, may be ineffective for some people when taken orally. Day/night systems help manage drowsiness by eliminating caffeine and adding a sedating antihistamine at night. Alcohol consumption is a common concern for users; this guide aims to address that gap by providing clear warnings based on official medical guidance.

What do official sources say about cold and flu tablets?

“Paracetamol is one of the most common ingredients in cold and flu tablets, but it’s crucial not to exceed the maximum dose.”
— NHS UK (nhs.uk/medicines/paracetamol-for-adults)

“Do not drink alcohol while taking paracetamol. It can increase the risk of liver damage.”
— NHS UK

“Night-time cold and flu products often contain an antihistamine such as diphenhydramine which can cause drowsiness.”
— Patient.info

Summary: what should you do next when choosing cold and flu tablets?

Choosing the right cold and flu tablet depends on matching the ingredients to your symptoms. If you have a fever and mild pain, a paracetamol-based product is appropriate. If you suffer from body aches and inflammation, consider ibuprofen. Always check whether the product includes a decongestant, caffeine, or a sedating antihistamine and whether you need those. Avoid alcohol entirely during treatment. If symptoms persist beyond seven days, consult a doctor. If you are looking for a late night pharmacy near me for urgent needs, many larger Boots and Tesco stores operate with extended hours. For further information on throat discomfort, see our guide on swollen glands in neck.

Frequently asked questions about cold and flu tablets