Choose by what is in the whole container: Red Bull lists 80 mg caffeine in a 250 ml Original can, while Monster Energy UK lists 160 mg caffeine and 0 g sugar in a 500 ml Zero Sugar can. Lucozade Energy is a sparkling, glucose-containing range, but check the label of the particular drink rather than assuming it has the same caffeine content as Lucozade Alert. If you become sleepy while driving, stop safely and rest instead of relying on a drink to keep going.
A chilled sparkling drink may be something to have at a planned stop. Check caffeine per can, but keep the stop itself in the plan: UK road-safety guidance from THINK! advises drivers who feel sleepy to stop safely and rest.
A zero-sugar label answers one question, not the caffeine question. Monster Energy UK lists 0 g sugar and 160 mg caffeine per 500 ml Zero Sugar can; compare both figures with the exact alternative you are considering.
Red Bull lists 80 mg caffeine per 250 ml Original can, compared with Monster Energy UK’s 160 mg per 500 ml Original Green or Zero Sugar can. Include any coffee, tea or other caffeinated drinks when planning what to take on the journey.
Start with the drink’s range and full-can size, then compare its caffeine and sugar figures. A familiar brand name alone will not tell you whether you have picked its standard, zero-sugar or differently formulated range.
| Priority | What to check | Your needs |
|---|---|---|
| Caffeine per can | Read the milligrams for the full container, not just per 100 ml. Red Bull lists 80 mg per 250 ml Original can; Monster Energy UK lists 160 mg per 500 ml Original Green or Zero Sugar can. | I would rather know what one complete can adds to the coffee, tea or other caffeinated drinks I may have that day. |
| Sugar and formulation | Compare grams of sugar for the exact can. Monster Energy UK lists 55 g per 500 ml Original Green can and 0 g per 500 ml Zero Sugar can; both list 160 mg caffeine. | If I choose zero sugar, I still want to check the caffeine. If I choose a sugared drink, I want to know its sugar amount for the portion I will actually drink. |
| Range and size | Check whether the can is 250 ml or 500 ml and read its full range name. Lucozade describes Energy as sparkling and glucose-containing, but separately identifies Alert as high-caffeine; Lucozade lists 160 mg caffeine per 500 ml Alert can. | A smaller can may suit the portion I want, or I may prefer a particular flavour. I do not want to mistake one Lucozade range for another. |
| Driving breaks | Make a safe place to stop part of the journey plan. THINK! advises stopping safely when sleepy and resting for 10 to 15 minutes after a caffeinated drink as a short-term measure. | If I become drowsy, I need to stop and rest rather than open a can and continue driving. |
| Who will drink it | Read the warning on each variant before sharing a multipack. Relentless says its White Citrus drink is not recommended for children, people sensitive to caffeine, pregnant women or women who are nursing. | A shared pack needs to suit the people who might take a can, not just the person buying it. |
Container size changes the amount you consume at once. Red Bull lists 80 mg caffeine in its 250 ml Original can, while Monster Energy UK lists 160 mg in each of its 500 ml Original Green and Zero Sugar examples.
Compare caffeine in milligrams per complete can, then account for other caffeinated drinks during the day.
Can size and sugar formulation are different choices: Monster Energy UK lists 0 g sugar for its 500 ml Zero Sugar drink, while Red Bull Original is a sugar-containing 250 ml drink.
Read the sugar figure on the exact can alongside its caffeine figure, particularly when comparing different sizes or variants.
A caffeinated drink does not replace sleep. THINK! road-safety guidance places it within a stop and short rest, not continued driving through drowsiness.
Stop somewhere safe if you feel sleepy and rest before considering whether to continue your journey.
Warnings can matter to others travelling with you. Relentless states that White Citrus is not recommended for children, caffeine-sensitive people, pregnant women or women who are nursing.
Check the label of each drink you plan to share rather than applying one variant’s wording to every product in the pack.
Range names matter as much as brands when you compare cans. These references describe particular products or ranges, not every drink made or stocked under each name.
Red Bull Original provides a defined 250 ml can for comparison with larger formats.
Monster Energy UK specifies both Original Green and Zero Sugar in 500 ml cans.
White Citrus is one named flavour to check individually when comparing energy drinks.
Lucozade Energy and Lucozade Alert are distinct ranges: Lucozade describes Energy as sparkling and glucose-containing, and Alert as high-caffeine.
Tesco has an energy-drinks grocery category where shoppers can check listed can and pack formats.
These Joybuy options include compact cans and larger flavoured or zero-sugar energy drinks in multipacks. Compare each exact variant’s label before choosing what to take to a road-trip stop.
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This 12-can pack offers a zero-sugar option for planned stops. Check the caffeine amount on the Green Zero Sugar can and include other caffeinated drinks in your day’s total; zero sugar does not mean caffeine-free.
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This fruit-flavoured 12-pack is a larger-can option for trip preparation. Check caffeine per 500 ml can and the current sugar information before deciding whether the portion suits your plans.
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This four-can lemonade-flavoured pack offers a different flavour from the Original and Zero Sugar variants. Compare caffeine and sugar on the Aussie Style Lemonade label rather than borrowing figures from another Monster drink.
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These 250 ml cans offer a smaller individual portion than the 500 ml packs above. Red Bull lists 80 mg caffeine for its 250 ml Original drink; check the current can for its sugar figure when comparing it with a zero-sugar choice.
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This four-pack combines the Zero variant with a compact 250 ml can. If you are comparing it with Red Bull Original, read the Zero can’s own sugar and caffeine information rather than assuming the formulations match.
No. UK road-safety guidance from THINK! advises stopping in a safe place when sleepy, then having a caffeinated drink and resting for 10 to 15 minutes as a short-term measure. A drink is not a substitute for sleep or for stopping.
Count caffeine from the entire can alongside other sources, including coffee and tea. In its 2015 assessment, the European Food Safety Authority stated that daily intakes from all sources up to 400 mg do not raise safety concerns for adults; that figure is not a target to consume.
Check each product’s warning before sharing it. For example, Relentless says White Citrus is not recommended for children, people sensitive to caffeine, pregnant women or women who are nursing. Do not assume every traveller or every drink has the same suitability.
No. Lucozade describes Energy as a sparkling, glucose-containing range and separately describes Alert as high-caffeine. Lucozade states that a 500 ml Alert can contains 160 mg caffeine; check the label of the particular Energy drink rather than applying Alert’s figure to it.
The Department of Health and Social Care and Department for Education announced in July 2026 a planned restriction on sales of high-caffeine energy drinks to under-16s in England from April 2027, subject to Parliamentary approval. Check the current position before buying for someone under 16; that announcement does not establish the rules elsewhere in the UK.