Dr Pepper and Pepsi: Complete Caffeine Guide

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

• Dr Pepper (355 ml) = 42 mg caffeine (11.8 mg/100 ml).
• Pepsi (355 ml) = 38 mg caffeine (10.7 mg/100 ml).
• Diet Coke (355 ml) in the dataset is 46 mg, higher than Pepsi and Dr Pepper.
• One 240 ml cup of drip coffee has 96 mg, about 2–3× the caffeine of a cola can.

Caffeine content in Dr Pepper and Pepsi (exact numbers)

The dataset lists Dr Pepper at 42 mg per 355 ml can (11.8 mg/100 ml) and Pepsi at 38 mg per 355 ml can (10.7 mg/100 ml). These are single-serving values used on product nutrition tables and by beverage manufacturers and data aggregators such as USDA FoodData Central.

Quick comparison table: common colas and citrus sodas

Drink (serving)	Volume	Caffeine (mg)	mg per 100 ml
Dr Pepper	355 ml	42 mg	11.8 mg/100 ml
Pepsi	355 ml	38 mg	10.7 mg/100 ml
Diet Coke	355 ml	46 mg	13 mg/100 ml
Coca‑Cola (355 ml)	355 ml	34 mg	9.6 mg/100 ml
Mountain Dew	355 ml	54 mg	15.2 mg/100 ml
Barq's Root Beer	355 ml	22 mg	6.2 mg/100 ml
Sunkist Orange	355 ml	41 mg	11.5 mg/100 ml

How Dr Pepper and Pepsi compare to coffee and energy drinks

Colas are low-to-moderate sources of caffeine compared with coffee and energy drinks. For reference, a 240 ml cup of drip coffee in the dataset has 96 mg, and a 250 ml Red Bull has 80 mg. That means one can of Dr Pepper (42 mg) provides roughly 44% of the caffeine in a small cup of coffee and about half a Red Bull.

Drink	Serving	Caffeine (mg)
Drip coffee	240 ml	96 mg
Cold brew	240 ml	200 mg
Red Bull	250 ml	80 mg
Dr Pepper	355 ml	42 mg
Pepsi	355 ml	38 mg

What affects caffeine level in cola-style drinks

Caffeine in colas is controlled during manufacturing, but a few factors matter:

• Formulation: companies choose a target mg/100 ml; diet and regular versions can differ (see Diet Coke vs Coke Zero).
• Serving size: larger bottles or fountain pours increase total mg linearly with volume.
• Regional recipes: some countries use slightly different formulations or labelling standards; USDA FoodData Central and manufacturer nutrition labels are authoritative for US products.

About Diet Dr Pepper

Diet Dr Pepper is not listed in the provided dataset. Comparable diet colas in the dataset range from 34–46 mg per 355 ml (Coke Zero 34 mg, Diet Coke 46 mg), so Diet Dr Pepper is likely within that band; treat any number as an estimate unless you consult the product label.

Health and safety context

For healthy adults, the U.S. FDA cites a common guidance of up to 400 mg/day of caffeine as a reasonable limit; for pregnancy many authorities (including EFSA and U.S. clinical guidance summarized by Mayo Clinic) suggest limiting to around 200 mg/day. The American Academy of Pediatrics discourages caffeine-containing beverages for adolescents. These are general limits—individual sensitivity varies.

One 355 ml can of Dr Pepper (42 mg) is a small fraction of those limits: 42 mg is about 10% of a 400 mg daily ceiling and about 21% of a 200 mg pregnancy guideline. If you drink multiple caffeinated products (coffee, energy drinks, pills), add the exact mg amounts; product labels and databases such as USDA FoodData Central are reliable sources.

Timing and how much caffeine remains (metabolism)

Caffeine follows approximate first-order elimination; population-average half-life is about 5.7 hours. That means caffeine roughly halves every 5.7 hours. Below is a worked example starting from a single can dose for Dr Pepper (42 mg) and Pepsi (38 mg) using standard decay fractions: ~69% at 3 h, ~48% at 6 h, ~33% at 9 h, ~23% at 12 h.

Time after drinking	% remaining (avg)	Dr Pepper (42 mg)	Pepsi (38 mg)
0 h	100%	42 mg	38 mg
3 h	~69%	~29 mg	~26 mg
6 h	~48%	~20 mg	~18 mg
9 h	~33%	~14 mg	~13 mg
12 h	~23%	~10 mg	~9 mg

Individual half-life varies with age, liver function, pregnancy, smoking, and some medications; consult Mayo Clinic or a clinician about personal factors. If you need precise tracking for daily totals, use a tool such as CoffeeLog to log servings and see cumulative mg across drinks and time.

Practical takeaways and labeling tips

• Check the can or bottle label or manufacturer site for region-specific numbers; the dataset values above reflect common U.S. servings.
• Don’t assume diet versions are caffeine-free; some diet colas (Diet Coke) have more caffeine than their regular counterparts in the dataset.
• If sleep or anxiety is a concern, avoid caffeine within 6–12 hours of bedtime because a meaningful fraction remains (see decay table).

Medical caution: this page is informational, not medical advice. For pregnancy-specific or medical-dose questions, consult a healthcare professional. For authoritative reference numbers, see FDA guidance, USDA FoodData Central, EFSA and publications from the American Academy of Pediatrics.