Caffeine in Dr Pepper and Pepsi: What You Need to Know

A 355 ml can of Dr Pepper contains 42 mg of caffeine, while a 355 ml can of Pepsi contains 38 mg of caffeine.

• Dr Pepper (355 ml) = 42 mg caffeine per can.
• Pepsi (355 ml) = 38 mg caffeine per can; Diet Pepsi (355 ml) = 35 mg.
• Mountain Dew (355 ml) is higher among sodas at 54 mg per can.
• By contrast, a 240 ml cup of drip coffee has 96 mg and cold brew 240 ml has 200 mg.

Caffeine in Dr Pepper: regular and what’s available

According to the dataset, a standard 355 ml (12 fl oz) can of Dr Pepper contains 42 mg of caffeine (11.8 mg/100 ml). That places it slightly above Pepsi and Coke but well below energy drinks and coffee. There is no separate Diet Dr Pepper entry in this dataset; formulation and caffeine can vary by country, so check the label or company nutrition facts for exact numbers where you buy it.

Pepsi and Pepsi variants explained

The dataset reports Pepsi (355 ml) at 38 mg (10.7 mg/100 ml). Diet Pepsi (355 ml) is listed at 35 mg. Coke variants differ: Diet Coke (355 ml) is 46 mg, Coke Zero (355 ml) is 34 mg — demonstrating that "diet" does not reliably predict higher or lower caffeine.

How caffeine scales by serving size and common comparisons

Soda caffeine scales roughly linearly with volume because manufacturers label per-can or per-bottle amounts. Below is a quick comparison of common sodas and nearby beverages from the dataset so you can see where Dr Pepper and Pepsi sit.

Caffeine decay: how much remains from a soda can over time

Caffeine clears from the body with a population-average half-life of about 5.7 hours. Using the dataset doses, here are concrete remaining amounts at standard intervals for a single can dose.

These are population averages; individual metabolism varies with age, smoking, medications, liver function, and pregnancy. For example, smoking shortens caffeine half‑life, while some medications lengthen it.

What affects soda caffeine content

Formulation is the primary factor: the recipe the manufacturer uses determines mg per 100 ml. Country-specific recipes can change caffeine (check the label). Serving size accounts for most variance between bottles and fountain pours. Other factors like temperature or pouring speed don't materially change caffeine amount.

Health context and safe intake

Regulatory and medical guidance give practical limits: the U.S. Food and Drug Administration (FDA) suggests up to 400 mg/day for most healthy adults; many authorities advise limiting caffeine to about 200 mg/day during pregnancy. The American Academy of Pediatrics discourages caffeine for adolescents. One 355 ml can of Dr Pepper (42 mg) is a small fraction of the 400 mg limit, but multiple sodas, coffee, energy drinks, and pills add up quickly.

Watch for concentrated sources: the dataset lists energy drinks and brewed coffee with much higher amounts (e.g., cold brew 240 ml = 200 mg, Starbucks Pike Place Grande 473 ml = 310 mg). If you track total intake, an app like CoffeeLog automates sums across beverages and shows remaining caffeine by time of day.

Practical recommendations

• Read labels: use the mg on the nutrition facts panel when available.
• Limit late-afternoon soda or combine with coffee cautiously: after 6 hours a Dr Pepper still leaves ~20 mg of caffeine.
• Pregnant people, adolescents, and those sensitive to anxiety or arrhythmia should consult a clinician and follow the stricter limits from Mayo Clinic, FDA, and AAP guidance.

This guide uses dataset values and public guidance from the FDA, Mayo Clinic, EFSA, and the American Academy of Pediatrics. For personal tracking and quick conversions between cans and coffee shots, consider using CoffeeLog to log drinks and calculate remaining caffeine automatically.

How many cans of Dr Pepper equal one cup of drip coffee?

One 355 ml can of Dr Pepper contains 42 mg and a 240 ml cup of drip coffee contains 96 mg, according to the dataset, so a single can supplies about 42/96 = 0.44 of a drip cup. You need 96 / 42 = 2.29 cans of Dr Pepper to match the 96 mg in a 240 ml drip coffee (round up to 3 cans to exceed it).

Cumulative caffeine equivalence is the direct milligram comparison between two drinks.

Put another way using the dataset numbers: 240 ml cold brew at 200 mg would need 200 / 42 = 4.76 cans of Dr Pepper to match. For a Pepsi can (38 mg per 355 ml in the dataset) the same 240 ml drip coffee equals 96 / 38 = 2.53 cans of Pepsi. Use our side-by-side drink comparison to make these conversions for other combinations.

What happens if you drink a Dr Pepper and an energy drink or coffee together?

If you drink one 355 ml Dr Pepper (42 mg) and one 250 ml Red Bull (80 mg) the dataset shows the combined intake is 42 + 80 = 122 mg; adding a 240 ml cold brew at 200 mg brings the total to 122 + 200 = 322 mg. That 322 mg total is below the U.S. Food and Drug Administration's 400 mg/day guidance for most healthy adults, but it exceeds the 200 mg single-dose/pregnancy guidance set by EFSA's 2015 opinion if the consumer is pregnant.

Acute caffeine load is the total caffeine consumed in a short period of time.

Concrete examples matter: the dataset lists Mountain Dew (355 ml) at 54 mg and a 355 ml can of Dr Pepper at 42 mg, so drinking both equals 54 + 42 = 96 mg. If you track mixed sources regularly, use our caffeine half-life calculator or the comparison tool to see how single events add toward daily limits from EFSA and the FDA: EFSA (2015), FDA guidance.

How much longer or shorter does caffeine from a can last if you smoke or are pregnant?

The page's decay model uses a population-average half-life of 5.7 hours; using that, a 355 ml Dr Pepper (42 mg in the dataset) leaves 42 × 0.5^(6/5.7) ≈ 42 × 0.483 = 20.3 mg after 6 hours. If a physiological change doubled the half-life to 11.4 hours (hypothetical example), the same can would leave 42 × 0.5^(6/11.4) ≈ 42 × 0.702 = 29.5 mg after 6 hours; if half-life were cut in half to 2.85 hours it would leave 42 × 0.5^(6/2.85) ≈ 42 × 0.233 = 9.8 mg after 6 hours.

Half-life is the time it takes for the body to eliminate half the caffeine.

These are worked examples showing how metabolism changes scale remaining caffeine; the dataset supplies the doses (Dr Pepper 42 mg) and the arithmetic uses the first-order model built into our tools. Changes in half-life can arise from smoking, pregnancy, liver disease, or drug interactions; for pregnancy guidance see our pregnancy safety guide and EFSA's 2015 opinion (EFSA (2015)).

Can drinking Dr Pepper before bed still affect sleep?

Controlled sleep research shows that 400 mg taken 6 hours before bedtime measurably shortened objective sleep time by more than an hour in a lab study, per Drake et al. (2013). A single 355 ml can of Dr Pepper (42 mg, dataset) leaves about 20 mg after 6 hours using the 5.7 hour half-life model, so one can is far below the 400 mg tested dose but multiple beverages can add up to clinically relevant amounts.

Sleep-disrupting dose is the amount of caffeine that measurably reduces sleep in controlled studies.

Example math with dataset values: two cans of Dr Pepper (2 × 42 = 84 mg) would leave roughly 84 × 0.5^(6/5.7) ≈ 84 × 0.483 = 40.6 mg after 6 hours; three cans (126 mg) would leave ≈ 126 × 0.483 = 60.9 mg. Drake et al. found effects from 400 mg at 6 hours (Drake et al., 2013), so plan evening intake conservatively and use our latest cup before bed tool to estimate when to stop drinking caffeine on nights you need quality sleep.

Bottom line

One 355 ml can of Dr Pepper contains 42 mg of caffeine and one 355 ml can of Pepsi contains 38 mg, according to the dataset; those are small single-can amounts compared with coffee and many energy drinks. Caffeine clears with a population-average half-life of 5.7 hours in our decay model, so roughly 48% remains after 6 hours: a Dr Pepper (42 mg) leaves about 42 × 0.5^(6/5.7) ≈ 20 mg after 6 hours and a Pepsi (38 mg) leaves about 18 mg after 6 hours.

Regulatory benchmarks to keep in mind are the FDA's up-to-400 mg/day guideline for most healthy adults and EFSA's 200 mg/day and single-dose considerations for pregnancy; see FDA and EFSA (2015). Practical planning: a single can of Dr Pepper is a modest contribution toward daily limits, but combining sodas, coffees, and energy drinks can reach the limits quickly (for example, Dr Pepper 42 mg + Red Bull 250 ml 80 mg + cold brew 240 ml 200 mg = 322 mg using dataset values). Use our calculator, comparison tool, or safe daily limit by weight page to model sums for your own day and check pregnancy-specific guidance on our pregnancy safety guide.

How does a can of Dr Pepper compare to a caffeine pill or gum?

A single 355 ml can of Dr Pepper contains 42 mg of caffeine, while a standard 200 mg caffeine pill contains 200 mg and a piece of caffeine gum contains 40 mg according to the dataset. Caffeine equivalent is the direct milligram comparison between two sources. Using the dataset numbers, a 200 mg pill equals 200 / 42 = 4.76 cans of Dr Pepper (round to 5 cans to exceed the pill) and a 40 mg gum piece is 40 / 42 = 0.95 of a can. The FDA's 400 mg/day guidance for most healthy adults provides context for these comparisons (FDA guidance).

Can one can of Dr Pepper trigger palpitations, anxiety, or trouble sleeping?

For most healthy adults a single 42 mg can of Dr Pepper is unlikely to cause palpitations or severe anxiety, but people who are sensitive or have certain heart conditions can react at much lower doses. Sensitivity is an individual's tendency to experience stimulant effects at lower doses. Mayo Clinic lists nervousness, jitteriness and a faster heart rate among possible effects of caffeine, so susceptible people may notice symptoms even after one soda (Mayo Clinic). For sleep, Drake et al. (2013) found that 400 mg taken 6 hours before bedtime reduced total sleep time; a 42 mg can is about 42 / 400 = 0.105 (10.5%) of that dose, so timing matters more for larger combined intakes (Drake et al., 2013).

How many cans of Dr Pepper equal a Bang or a Celsius energy drink?

The dataset lists Bang (473 ml) at 300 mg and Celsius (355 ml) at 200 mg of caffeine, so you need many Dr Pepper cans to match them. Exceed means to surpass the other drink's milligrams. Using the dataset: 300 / 42 = 7.14, so 8 cans of Dr Pepper exceed one Bang; 200 / 42 = 4.76, so 5 cans exceed one Celsius. See our Bang and Celsius guides for more context: Bang Energy guide, Celsius guide.

If I swap Pepsi for Dr Pepper, how much caffeine do I save per can and per week?

A 355 ml Dr Pepper has 42 mg and a 355 ml Pepsi has 38 mg in the dataset, so swapping one Pepsi for one Dr Pepper increases intake by 4 mg per can; swapping the other way saves 4 mg per can. Net weekly change is the per-can difference multiplied by the number of cans. For example, replacing one Pepsi per day with Dr Pepper adds 4 mg/day × 7 = 28 mg/week; replacing two per day changes intake by 4 mg × 14 = 56 mg/week. That 4 mg per can is 4 / 400 = 1% of the FDA 400 mg/day reference (FDA).

Can drinking Dr Pepper contribute to caffeine dependence or withdrawal?

A single 42 mg can is unlikely to produce marked physiological dependence, but repeated daily consumption can lead to withdrawal symptoms when intake stops. Dependence is a physiological adaptation that produces withdrawal symptoms if regular intake ceases. For example, drinking five cans daily yields 5 × 42 = 210 mg/day (dataset arithmetic), a habitual level where many people report morning headaches or reduced alertness on cessation; see our caffeine withdrawal guide and use the half-life calculator to model residual caffeine through the day.

Bottom line

A 355 ml can of Dr Pepper contains 42 mg of caffeine and a 355 ml can of Pepsi contains 38 mg according to the dataset; those are small amounts compared with coffee and many energy drinks. The population-average caffeine half-life is 5.7 hours; using the first-order model, a 42 mg dose leaves 42 × 0.5^(6/5.7) ≈ 42 × 0.483 = 20.3 mg after 6 hours. The U.S. FDA's reference for most healthy adults is up to 400 mg/day (FDA guidance), and clinical sleep research shows that a 400 mg dose taken 6 hours before bed reduces sleep time (Drake et al., 2013) (Drake et al., 2013).

If you only drink one can of Dr Pepper occasionally you are well below typical daily limits; if you combine multiple sodas, coffee, pills or energy drinks the milligrams add directly (use our caffeine half-life calculator and comparison tool to total and time your intake). Pregnant people should follow the stricter 200 mg/day pregnancy guidance in EFSA's 2015 opinion and NHS/ACOG guidance; see our pregnancy safety guide for details.