Part of our Mushroom Coffee guide library.
Short answer: Yes. Caffeine is a drug: it is a stimulant that acts on the central nervous system by blocking adenosine, a brain chemical that builds up sleep pressure. In the U.S. it is legal and is not a controlled substance. The FDA regulates it as a drug in over-the-counter alertness aids, at 100 to 200 mg per dose, and as a food ingredient in coffee, tea and soda.
Most of us never think of the morning coffee as a drug, yet the same molecule is sold in pharmacies as an alertness aid, added to pain relievers and given by prescription in hospitals. Here is how U.S. regulators classify caffeine, what it does in your body, whether it is addictive, and how a cup of coffee compares with a caffeine pill.
What you'll learn
- Why caffeine counts as a drug, and what kind of drug it is
- How the FDA, DEA and anti-doping rules treat caffeine
- Whether caffeine is addictive, and what withdrawal looks like
- How much caffeine is in coffee, tea and soda compared with caffeine pills
Caffeine's status at a glance
| Where caffeine shows up | How it is regulated | Caffeine | Source |
|---|---|---|---|
| Over-the-counter alertness aids | OTC stimulant drug | 100–200 mg per dose, not more often than every 3–4 hours (adults and children 12+) | 21 CFR Part 340 |
| NoDoz Alertness Aid | OTC drug ("alertness aid") | 200 mg per caplet | DailyMed |
| Excedrin Extra Strength | OTC drug ("pain reliever aid") | 65 mg per caplet | DailyMed |
| Caffeine citrate injection | Prescription drug (apnea of prematurity) | Dosed by a clinician | DailyMed |
| Cola-type soft drinks | Food ingredient, generally recognized as safe | Up to 0.02% | 21 CFR 182.1180 |
| Coffee and tea | Food (naturally occurring) | About 95 mg per 8 fl oz brewed coffee | USDA |
| DEA controlled substances list | Not listed | — | DEA |
| World Anti-Doping Agency, 2026 | Monitoring Program, not prohibited | — | WADA |
Regulations and labels were checked on October 25, 2026. Brand names are used only to show what is on a real label.
Is caffeine a drug?
Yes. Caffeine is a psychoactive drug, meaning it changes how your brain works, and federal rules treat it as one when it is sold for its effects. FDA regulations define a stimulant as "a drug which helps restore mental alertness or wakefulness during fatigue or drowsiness," and caffeine is the active ingredient approved for that use (21 CFR Part 340). It is also described as the most commonly used drug in the world (Meredith et al., 2013), and a national survey found that 85% of Americans have at least one caffeinated drink a day (Mitchell et al., 2014).
The same caffeine is a natural part of coffee, tea and cacao; it occurs in more than 60 plants (MedlinePlus). The FDA notes there is no difference in how your body handles caffeine that occurs naturally and caffeine that is added to a product (FDA).
What kind of drug is caffeine?
Caffeine is a central nervous system stimulant. MedlinePlus explains that it stimulates your central nervous system, which can make you feel more awake and give you a boost of energy (MedlinePlus). It works by blocking adenosine receptors (McLellan et al., 2016). Adenosine is a natural sleep-regulating substance that helps make you sleepy, so blocking it delays that feeling (Reichert et al., 2022).
In a review of the research, low to moderate doses of about 40 to 300 mg improved alertness, vigilance, attention and reaction time (McLellan et al., 2016). At about 95 mg per 8-ounce cup of brewed coffee (USDA), that is roughly half a cup to three cups.
Is caffeine a controlled substance?
No. Caffeine does not appear on the Drug Enforcement Administration's list of controlled substances (DEA), so it is legal to buy and has no prescription requirement in drinks or alertness aids. Instead, the FDA regulates it by product: as a drug in over-the-counter stimulants (21 CFR Part 340) and as a food ingredient in cola-type beverages, where it is generally recognized as safe up to 0.02% (21 CFR 182.1180).
Pure powdered caffeine is the exception that worries regulators. One teaspoon can contain as much caffeine as 28 cups of coffee (FDA), and the FDA warns that toxic effects such as seizures can occur with rapid intake of around 1,200 mg (FDA).
Is caffeine banned in sports?
No. For 2026, the World Anti-Doping Agency lists caffeine in its Monitoring Program, which tracks use in competition, and states that these substances are not considered prohibited (WADA).
Is caffeine addictive?
Regular use can lead to dependence. MedlinePlus lists dependency, needing more caffeine to get the same results, among the effects of too much caffeine (MedlinePlus), and stopping suddenly can cause withdrawal with headaches, drowsiness, irritability, nausea and trouble concentrating.
A review of 66 studies found withdrawal symptoms typically start 12 to 24 hours after the last dose, peak at 20 to 51 hours and last 2 to 9 days, and can occur after stopping as little as 100 mg a day (Juliano and Griffiths, 2004). The FDA notes caffeine withdrawal is not considered dangerous, though it can be unpleasant (FDA). Psychiatry's diagnostic manual lists caffeine use disorder only as a condition for further study, not an established diagnosis (Meredith et al., 2013).
If you want to cut back, taper over a week or two instead of stopping at once. See caffeine withdrawal: how long it lasts and how to ease it.
How does a cup of coffee compare with a caffeine pill?
One NoDoz caplet has 200 mg of caffeine (DailyMed), about as much as two 8-ounce cups of brewed coffee at about 95 mg each (USDA). An Excedrin Extra Strength caplet adds 65 mg (DailyMed), similar to a shot of espresso at about 63 mg (USDA). Drinks vary widely, as the FDA's typical ranges for a 12-ounce serving show.
| Product | Serving | Caffeine | Source |
|---|---|---|---|
| NoDoz Alertness Aid | 1 caplet | 200 mg | DailyMed |
| Brewed coffee | 12 fl oz | 113–247 mg | FDA |
| Energy drink | 12 fl oz | 41–246 mg | FDA |
| Black tea | 12 fl oz | About 71 mg | FDA |
| Excedrin Extra Strength | 1 caplet | 65 mg | DailyMed |
| Caffeinated soft drink | 12 fl oz | 23–83 mg | FDA |
| Green tea | 12 fl oz | About 37 mg | FDA |
| NeuroCoffee (mushroom coffee) | 2 tbsp | 30 mg | Product Facts |
For brand-by-brand numbers, see how much caffeine is in coffee, caffeine in soda and caffeine in energy drinks.
How much caffeine is safe in a day?
For most healthy adults, the FDA cites 400 mg a day (FDA), roughly four 8-ounce cups of brewed coffee by our estimate. People vary in how sensitive they are, and pills, energy drinks and coffee all count toward the same total. See how much caffeine is too much.
How to use caffeine well during the workday
- Use the smallest dose that works. Benefits for alertness and attention show up from about 40 mg (McLellan et al., 2016), so you may not need a large coffee.
- Stop early. A meta-analysis suggests finishing a typical coffee, about 107 mg of caffeine, at least 8.8 hours before bed (Gardiner et al., 2023).
- Read labels on pills and pain relievers. Their caffeine adds to what you drink.
- Consider a lower-caffeine cup in the afternoon. A mushroom coffee or tea gives a smaller dose; see coffee alternatives.
Common myths (quick reality check)
Myth: Caffeine is not a drug because it comes from plants. Reality: Caffeine is a stimulant drug whether it comes from coffee beans or a pill, and the FDA says your body handles natural and added caffeine the same way.
Myth: Caffeine is a controlled substance. Reality: It is not on the DEA's controlled substances list. The FDA regulates it as an OTC drug and as a food ingredient instead.
Myth: Caffeine withdrawal is dangerous. Reality: The FDA says it is not considered dangerous, though headaches and fatigue can make the first few days unpleasant.
Frequently asked questions (FAQ)
Is caffeine a drug?
Yes. Caffeine is a stimulant drug that blocks adenosine in the brain. It is legal, is not a controlled substance, and is regulated by the FDA as an OTC drug and as a food ingredient.
What kind of drug is caffeine?
A central nervous system stimulant. It blocks adenosine receptors, which delays sleepiness and can improve alertness and reaction time.
Is caffeine a stimulant?
Yes. FDA rules make caffeine the active ingredient in OTC stimulant products, which help restore alertness or wakefulness during fatigue or drowsiness.
Is caffeine a controlled substance?
No. Caffeine is not on the DEA's list of controlled substances, so it needs no prescription in drinks or alertness aids.
Is caffeine addictive?
Regular use can lead to dependence, and stopping suddenly can cause withdrawal symptoms such as headache and fatigue that usually last 2 to 9 days.
How much caffeine is in a caffeine pill?
A NoDoz caplet has 200 mg, and OTC alertness aids are labeled for 100 to 200 mg per dose, not more often than every 3 to 4 hours.
Is caffeine banned in sports?
No. The World Anti-Doping Agency lists caffeine in its 2026 Monitoring Program and does not consider it a prohibited substance.
How much caffeine is safe per day?
For most healthy adults, the FDA cites 400 mg a day, roughly four 8-ounce cups of brewed coffee.
Related guides
- How much caffeine is too much?
- Caffeine withdrawal
- How long does caffeine stay in your system?
- How much caffeine is in a cup of coffee?
- Coffee alternatives
Disclaimer and when to seek help
This article is for general education and is not medical advice. These statements have not been evaluated by the Food and Drug Administration. Our products are not intended to diagnose, treat, cure, or prevent any disease. Brand names are trademarks of their respective owners, and OurJrney is not affiliated with them. Label and regulatory information was checked on October 25, 2026, and may change. Use caffeine-containing medicines only as directed on the label. Talk to your health care provider about caffeine if you are pregnant, trying to become pregnant or breastfeeding, have a heart condition, anxiety or high blood pressure, or take medication.
References
- Electronic Code of Federal Regulations. 21 CFR Part 340, Stimulant drug products for over-the-counter human use and 21 CFR 182.1180, Caffeine.
- U.S. Food and Drug Administration. "Spilling the Beans: How Much Caffeine Is Too Much?" Content current as of August 28, 2024; and Pure and Highly Concentrated Caffeine.
- MedlinePlus, National Library of Medicine. Caffeine.
- DailyMed, National Library of Medicine. Labels for NoDoz Alertness Aid, Excedrin Extra Strength and Caffeine Citrate Injection.
- Drug Enforcement Administration, Diversion Control Division. Controlled Substances, Alphabetical Order.
- World Anti-Doping Agency. 2026 Prohibited List.
- McLellan TM, Caldwell JA, Lieberman HR. "A review of caffeine's effects on cognitive, physical and occupational performance." Neuroscience & Biobehavioral Reviews, 2016;71:294-312. doi:10.1016/j.neubiorev.2016.09.001
- Mitchell DC, Knight CA, Hockenberry J, Teplansky R, Hartman TJ. "Beverage caffeine intakes in the U.S." Food and Chemical Toxicology, 2014;63:136-142. doi:10.1016/j.fct.2013.10.042
- Juliano LM, Griffiths RR. "A critical review of caffeine withdrawal." Psychopharmacology, 2004;176(1):1-29. doi:10.1007/s00213-004-2000-x
- Meredith SE, Juliano LM, Hughes JR, Griffiths RR. "Caffeine use disorder: A comprehensive review and research agenda." Journal of Caffeine Research, 2013;3(3):114-130. doi:10.1089/jcr.2013.0016
- Gardiner C, Weakley J, Burke LM, et al. "The effect of caffeine on subsequent sleep: A systematic review and meta-analysis." Sleep Medicine Reviews, 2023;69:101764. doi:10.1016/j.smrv.2023.101764
- Reichert CF, Deboer T, Landolt HP. "Adenosine, caffeine, and sleep-wake regulation: state of the science and perspectives." Journal of Sleep Research, 2022;31(4):e13597. doi:10.1111/jsr.13597
- U.S. Department of Agriculture. FoodData Central: brewed coffee (FDC 171890) and espresso (FDC 171891).
