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Dark roast coffee usually matches medium roasts—about 80–120 mg per 8-oz cup; grind, ratio, and brew time drive the caffeine.

One 12-ounce can of Coca-Cola has about 34 mg of caffeine; Diet Coke is closer to 46 mg per 12 oz.

One candy-coated espresso bean averages ~12 mg caffeine; 10 beans ~120 mg, and 28 beans (1 oz) about 336 mg based on USDA data.

Most regular drinkers feel withdrawal once daily intake drops by 100–200 mg, with headaches and fatigue peaking within 24–48 hours.

No defined caffeine amount causes heart failure; large single doses or chronic overuse raise risk—most adults stay under about 400 mg daily.

Eye twitching often flares once caffeine intake reaches roughly 200–300 mg, though sensitivity varies and total daily dose and timing matter.

For most healthy adults, daily caffeine up to 400 mg is generally tolerated; sensitivity varies by size, meds, and sleep habits.

Recommended daily caffeine intake is ~400 mg for healthy adults, ~200 mg in pregnancy or breastfeeding, and about 100 mg for teens.

For healthy adults, daily caffeine intake is about 400 mg; during pregnancy, limit caffeine to ~200 mg.

Most adults on Wellbutrin do best with 0–200 mg caffeine per day, in small early servings, after personal guidance from a clinician.