Vyvanse and Caffeine: What the FDA Label and Studies Say
Roon Team
Vyvanse and Caffeine: What the FDA Label and Studies Say
Vyvanse and caffeine are both central nervous system stimulants. The FDA-approved label for Vyvanse (lisdexamfetamine) does not list caffeine as an interaction, and no clinical trial has established a caffeine amount that is appropriate to combine with it. The effects these two stimulants share, including faster heart rate, higher blood pressure, insomnia, anxiety, and feeling jittery, can stack. How much caffeine fits alongside your prescription is a question for your prescriber or pharmacist.
Key Takeaways
- The word "caffeine" does not appear anywhere in the Vyvanse prescribing label or its Medication Guide.
- One manufacturer-run pharmacokinetic study (n=30) found that lisdexamfetamine did not change caffeine blood levels, but it did not measure heart rate, sleep, or anxiety outcomes of the combination.
- Several overlapping side effects (insomnia, anxiety, jitteriness, increased heart rate, increased blood pressure) appear on both the Vyvanse label and the FDA's caffeine page.
- Ask your prescriber or pharmacist before changing your caffeine habits while on Vyvanse. No article can substitute for that conversation.
What Is Vyvanse, and How Long Does It Act?
Vyvanse (lisdexamfetamine dimesylate) is a Schedule II controlled substance approved for ADHD in adults and pediatric patients aged 6 and older, and for moderate to severe binge eating disorder in adults. It carries a boxed warning for high potential for abuse and misuse.
Lisdexamfetamine is a prodrug converted to dextroamphetamine and L-lysine primarily in the blood by red blood cells. Per the label's pharmacokinetics section, dextroamphetamine reaches peak plasma concentration (Tmax) at about 3.8 hours in fasted healthy adults, with an elimination half-life of approximately 10 to 11.3 hours in healthy adults and 8.6 to 9.5 hours in pediatric patients aged 6 to 12 (Vyvanse label, Section 12.3). An adult workplace-environment study in the label measured effects at 2, 4, 8, 10, 12, and 14 hours post-dose.
The label states that Vyvanse is taken in the morning, with or without food, and that afternoon doses are avoided because of the potential for insomnia. Food prolongs dextroamphetamine's Tmax by about 1 hour without changing total exposure. The label also reports that neither food nor orange juice affected dextroamphetamine AUC or Cmax after a single 70 mg capsule.
Does the Vyvanse Label Mention Caffeine?
No. A full-text search of the current Vyvanse prescribing label (SPL effective date April 2026, Takeda Pharmaceuticals) returns zero matches for the word "caffeine."
Section 7 of the label lists the following drug interactions:
- MAO inhibitors: contraindicated, including within 14 days of use
- Serotonergic drugs: risk of serotonin syndrome
- CYP2D6 inhibitors: may increase exposure to dextroamphetamine
- Urinary alkalinizing agents: raise amphetamine blood levels (label says these "should be avoided")
- Urinary acidifying agents: lower amphetamine blood levels and efficacy
- Tricyclic antidepressants: possible enhanced activity of tricyclic antidepressants
Caffeine is absent from this list. That absence is not proof of safety. Drug labels list interactions that have been studied, reported, or are pharmacologically predicted. An interaction that has never been formally studied may simply be missing rather than ruled out.
Can You Drink Coffee on Vyvanse? What One Study Measured
The closest thing to a controlled answer comes from a 2015 manufacturer-run study. Ermer et al. gave 30 healthy volunteers the Cooperstown cocktail (200 mg caffeine as a CYP1A2 probe, plus dextromethorphan, omeprazole, and midazolam) alone or with a single oral dose of lisdexamfetamine 70 mg, in an open-label, randomized, two-period crossover design (Ermer et al., Drugs R&D, 2015).
The results for caffeine:
| Measure | Without Lisdexamfetamine | With Lisdexamfetamine |
|---|---|---|
| Caffeine Cmax (ng/mL) | 5,370 | 5,246 |
| Caffeine AUC (ng·h/mL) | 56,207 | 56,688 |
The differences were within the standard bioequivalence range. The authors concluded that lisdexamfetamine did not alter CYP1A2 activity. No serious or severe adverse events occurred.
The limits matter. It enrolled healthy volunteers, not patients with ADHD or cardiovascular risk factors. It used a single dose, measured drug levels in blood, and did not track heart rate, blood pressure, sleep, or anxiety as outcomes of the pair. It also did not test the reverse: whether caffeine changes Vyvanse levels. If you want to understand how coffee and Vyvanse interact in your body, at your dose, with your history, this study does not answer that. Your prescriber can.
Where the Effects Overlap
People ask about vyvanse and caffeine not because of pharmacokinetics but because of how they feel: jittery, heart racing, unable to sleep. Both substances list overlapping adverse effects.
The table below shows selected adverse-effect rates from the Vyvanse adult ADHD trial alongside what the FDA's consumer caffeine page and the research literature document for caffeine. These are not additive. Do not combine the columns to predict a joint effect.
| Effect | Vyvanse (adult ADHD trial, n=358) | Placebo (n=62) | Documented for caffeine |
|---|---|---|---|
| Insomnia | 27% | 8% | Listed by the FDA as a sign of too much caffeine |
| Anxiety | 6% | 0% | Listed by the FDA as a sign of too much caffeine |
| Feeling jittery | 4% | 0% | Listed by the FDA ("jitters") |
| Increased heart rate | 2% | 0% | Listed by the FDA; mean increase ~3 to 6 bpm on Vyvanse label |
| Increased blood pressure | 3% | 0% | In hypertensive individuals, 200 to 300 mg caffeine raised systolic BP by a mean 8.1 mm Hg acutely (Mesas et al., Am J Clin Nutr, 2011); Vyvanse label reports a mean increase of about 2 to 4 mm Hg |
| Decreased appetite | 27% | 2% | Caffeine may reduce appetite in some people |
| Dry mouth | 26% | 3% | Caffeine is a mild diuretic |
Drugs.com classifies the caffeine-lisdexamfetamine interaction as "moderate," citing additive stimulant and cardiovascular effects. That is Drugs.com's editorial classification, not the FDA's.
Coffee and Vyvanse vs. Energy Drinks and Vyvanse: Why the Dose Is Hard to See
Part of what makes this question difficult is that "one drink" is not a stable unit of caffeine. The FDA's consumer caffeine page gives approximate ranges per 8 fluid ounces:
| Beverage (per 8 fl oz) | Caffeine range |
|---|---|
| Regular brewed coffee | ~80 to 100 mg |
| Energy drink | 40 to 250 mg |
| Black tea | 30 to 50 mg |
| Caffeinated soft drink (per 12 fl oz) | 30 to 40 mg |
Serving sizes vary widely, and many coffees and energy drinks come in containers well above 8 ounces. When someone tells a prescriber "I have one coffee in the morning," that could mean very different amounts depending on the cup size and brew method. Being specific helps. For a deeper look at the range, see how much caffeine is in a cup of coffee.
The FDA's general guidance that 400 mg per day is "not generally associated with negative effects" applies to healthy adults who are not taking other stimulants. It is not a figure for people on Vyvanse.
Does Vitamin C or Coffee Acidity Change How Vyvanse Works?
This question circulates widely online. The Vyvanse label does address urinary pH: acidifying agents such as ascorbic acid (vitamin C) can lower amphetamine blood levels, and alkalinizing agents such as sodium bicarbonate can raise them.
But the label also specifically reports that orange juice did not change dextroamphetamine exposure (AUC or Cmax) from the capsule in healthy adults. The label says nothing about coffee's effect on Vyvanse absorption. Claiming that coffee's acidity blocks Vyvanse is not supported by the label. Caffeine's own half-life varies from person to person for reasons that go beyond pH.
Who Should Be Most Careful
The Vyvanse label contains specific warnings about cardiovascular risk. It states that CNS stimulants cause mean increases of about 2 to 4 mm Hg in blood pressure and about 3 to 6 bpm in heart rate, with some patients experiencing larger increases. The label says to avoid Vyvanse in patients with known structural cardiac abnormalities, cardiomyopathy, serious cardiac arrhythmia, coronary artery disease, or other serious cardiac conditions.
The Medication Guide tells patients to disclose heart problems, high blood pressure, mental health history, circulation problems, kidney problems, tics, pregnancy, or breastfeeding before starting Vyvanse. The FDA's caffeine page likewise notes that certain conditions and medications can make people more sensitive to caffeine.
Children and adolescents on Vyvanse may warrant extra attention. In the label's pediatric trials, insomnia occurred in 22% of children aged 6 to 12 (n=218) and 13% of adolescents aged 13 to 17 (n=233).
If you experience chest pain, fainting, or shortness of breath, that is a medical emergency. Call 911.
What to Ask Your Prescriber or Pharmacist
No article can tell you whether your caffeine intake is compatible with your Vyvanse dose, your blood pressure, and your other medications. Your prescriber or pharmacist can. Here are questions worth bringing to that conversation:
- Is my usual caffeine amount a concern given my dose and my blood pressure readings?
- Should I track my pulse or blood pressure at home?
- Does it matter whether my caffeine comes from coffee, an energy drink, or a supplement?
- What symptoms would mean I should call you?
- Do any of my other medicines or supplements change this picture?
- How should I describe my caffeine intake so it is useful to you?
Bring specifics. Rather than "I drink coffee," estimate in milligrams using the FDA ranges above or the caffeine content on product labels. The more precise you are, the better the guidance. How long caffeine stays in your system is another variable worth raising.
The Label, the Study, and the Conversation That Fills the Gap
The FDA label for Vyvanse does not mention caffeine. The one controlled pharmacokinetic study found that lisdexamfetamine did not change caffeine blood levels, but it did not study what combining the two does to heart rate, blood pressure, or sleep. Several side effects of both substances overlap. The research does not give you a number, a cup count, or a timing rule. What it gives you is a reason to have a specific, informed conversation with the person who prescribed your medication.
If you use any caffeine product, including Roon, the same prescriber conversation applies.
Frequently Asked Questions
Can you drink coffee on Vyvanse?
The Vyvanse label does not prohibit coffee or mention caffeine. One pharmacokinetic study (n=30) found that lisdexamfetamine did not alter caffeine blood levels (Ermer et al., 2015). But the study did not measure the combined cardiovascular or sleep effects. Whether coffee fits with your prescription is a question for your prescriber, because the answer depends on your dose, your medical history, and your other medications.
Does caffeine make Vyvanse stronger or weaker?
The Ermer 2015 study measured caffeine levels, not Vyvanse levels, and found no change in caffeine pharmacokinetics. It did not test the reverse direction. There is no published evidence that caffeine makes Vyvanse stronger, weaker, or longer-lasting. Both are CNS stimulants, and their shared side effects (increased heart rate, blood pressure, insomnia) can overlap.
Is there an official caffeine limit with Vyvanse?
No. The Vyvanse label does not set one. The FDA's general guidance of 400 mg per day for healthy adults was not developed for people taking prescription stimulants. Some websites cite limits like 300 mg or "one cup a day" with Vyvanse, but those figures do not trace back to a clinical trial or the FDA. Ask your prescriber for guidance specific to you.
Why do I feel jittery when I drink coffee on Vyvanse?
Both Vyvanse and caffeine are central nervous system stimulants. The Vyvanse adult ADHD trial reported jitteriness in 4% of participants on the drug versus 0% on placebo. Caffeine also causes jitters at sufficient doses. When two stimulants that share this side effect are taken together, the effect may be more pronounced. If jitteriness is interfering with your day, bring it up with your prescriber.
Is decaf caffeine-free?
Not entirely. The FDA states that decaf coffee typically contains 2 to 15 mg of caffeine per 8-ounce cup. That is much less than regular coffee, but it is not zero. If your prescriber has asked you to eliminate caffeine, decaf may still be relevant to the conversation.
Are Adderall and Vyvanse the same for this question?
Related but not identical. Both are amphetamine-based stimulants, and the overlapping side effects with caffeine are similar. Vyvanse is a prodrug that converts to dextroamphetamine over time; Adderall contains a mix of amphetamine salts with a different release profile. The same "ask your prescriber" principle applies. For more on the Adderall side, see caffeine and Adderall.
Written by Roon Team
