Prime Energy has more caffeine than Dunkin Refresher (medium) on both counts: 200mg per 12 oz can against 99mg per 24 oz medium, and about 17mg per fluid ounce against 4. The serving sizes differ, so the table below shows both ways of counting.
These are different categories of drink, which changes how the caffeine arrives. Energy drinks and sodas list an exact number because caffeine is a measured additive; brewed drinks vary with the beans and the brew, so their figures are compiled averages. The numbers here are the standard published values for each.
Prime Energy vs Dunkin Refresher (medium): the numbers
| Prime Energy | Dunkin Refresher (medium) | |
|---|---|---|
| Caffeine per serving | 200mg per 12 oz can | 99mg per 24 oz medium |
| Caffeine per fl oz | 16.7mg | 4.1mg |
| Servings to reach 400mg (FDA context) | 2.0 | 4.0 |
Sources: Prime Energy's figure is verified in our Prime Energy caffeine guide against Caffeine Informer (source); Dunkin Refresher (medium)'s figure is verified in our Dunkin Refresher (medium) guide against Tasting Table / Dunkin figures (source).
The concentration gap is the striking part: Prime Energy packs roughly 4 times the caffeine per ounce. Sipping speed matters at that density; a 12 oz can finished in minutes hits differently than the same milligrams spread over a slow cup.
Which one should you pick?
Pick Dunkin Refresher (medium) when you want the lighter dose or a slower ramp, and Prime Energy when you actually need the bigger hit and know your tolerance. If you are stacking either with other caffeinated drinks through the day, run the math against the 400mg reference rather than guessing.
For context, the FDA cites 400mg of caffeine a day as an amount generally not associated with negative effects in healthy adults. Tolerance and health vary, so treat these numbers as information, not advice.
Related reading
- Prime Energy: the full caffeine guide
- Dunkin Refresher (medium): the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
FAQ
Does Prime Energy or Dunkin Refresher (medium) have more caffeine? Prime Energy: 200mg per 12 oz can versus 99mg per 24 oz medium for Dunkin Refresher (medium).
Which is stronger per ounce? Prime Energy, at about 16.7mg per fluid ounce versus 4.1mg for Dunkin Refresher (medium).
Comparing caffeine? The caffeine comparison tool puts hundreds of drinks side by side, and the caffeine curfew calculator can check your cutoff time for tonight.