By the NooBlue editorial team. NooBlue sells methylene blue. This page is written for people who already take Adderall, and its advice is to keep the two apart. It is general information, not medical advice.
Quick answer
No. Do not take methylene blue and Adderall together. The Adderall prescribing information lists monoamine oxidase inhibitors (MAOIs), “including MAOIs such as linezolid or intravenous methylene blue,” as a contraindication, because the combination raises the risk of a hypertensive crisis: a sudden, dangerous rise in blood pressure. Methylene blue blocks the enzyme MAO-A, and amphetamine releases the messengers that MAO-A clears, so the pairing can also cause serotonin syndrome.
The label and Drugs.com both use a 14-day gap: amphetamine only after at least 14 days off methylene blue. No study has tested a small oral supplement dose alongside a stimulant, so there is no known safe amount. Talk to your prescriber before you take any methylene blue while you are on Adderall.
A sudden severe headache, chest pain, confusion, a racing heart, fever or stiff muscles after taking both needs emergency care. Call 911.
Methylene blue and Adderall come up together for a simple reason. Many people who take Adderall for focus also read about methylene blue as a brain and energy supplement, and they want to know whether they can add it. The drug label answers that question clearly. This guide explains what the label says, the two ways the combination can go wrong, how long to wait in each direction, and what to do if you have already taken both. For a side-by-side look at how the two compounds work, see our methylene blue vs Adderall comparison.
Can you take methylene blue and Adderall together?
No. Adderall is a prescription stimulant medicine made of mixed amphetamine salts, used for ADHD and narcolepsy. Its prescribing information lists only two contraindications. One is an allergy to amphetamine. The other is taking a monoamine oxidase inhibitor, or having stopped one within the last 14 days, “including MAOIs such as linezolid or intravenous methylene blue,” because of an increased risk of hypertensive crisis (Adderall prescribing information).
In its drug interaction section, the label says a hypertensive crisis from an MAOI plus a stimulant can end in death, stroke, heart attack, aortic dissection, eye complications, fluid in the lungs or kidney failure. The same label warns that amphetamines combined with other drugs that act on serotonin, MAO inhibitors among them, can cause serotonin syndrome, which it calls potentially life-threatening.
Drugs.com rates Adderall with methylene blue as a major interaction. Its patient text says that combining the two “can cause dangerously high blood pressure and even death,” and that you may use amphetamine “only after you have been off methylene blue for at least 14 days” (Drugs.com interaction checker).
Your prescriber and pharmacist work from the same label, so this is the answer you are likely to hear from them. We give the same answer, even though we sell methylene blue.
Why the combination is risky: two separate problems
Both problems start with one enzyme. Monoamine oxidase A (MAO-A) breaks down serotonin, norepinephrine and dopamine after they have done their job. In a 2007 laboratory study in the British Journal of Pharmacology, Ramsay, Dunford and Gillman showed that methylene blue is a potent, tight-binding, reversible inhibitor of purified human MAO-A. It inhibits MAO-B too, but only at much higher concentrations (Ramsay et al., 2007).
Adderall works on the other side of the same system. Its label says amphetamines are thought to block the reuptake of norepinephrine and dopamine and to increase their release into the space between nerve cells. One drug pushes these messengers out. The other slows their cleanup.
Problem 1: blood pressure
Norepinephrine tightens blood vessels and speeds up the heart. Adderall alone raises both a little. Its label gives average increases of about 2 to 4 mm Hg in blood pressure and 3 to 6 beats per minute in heart rate, with larger rises in some people. When MAO is blocked, more norepinephrine builds up inside nerve endings, and a stimulant that releases it can push blood pressure far higher. That is the hypertensive crisis the label warns about, and it is why both the label and Drugs.com put blood pressure first.
Problem 2: serotonin syndrome
MAO-A is also the main enzyme that clears serotonin. Hospitals give methylene blue intravenously at 1 to 7.5 mg/kg for several medical uses. In a 2011 review in the Journal of Psychopharmacology, Gillman found that 13 of 14 reported cases of central nervous system toxicity after methylene blue were serotonin toxicity, caused by its MAO-blocking action meeting a serotonin reuptake inhibitor medicine (Gillman, 2011).
He also noted that an intravenous dose of only 0.75 mg/kg produced blood levels high enough to inhibit MAO-A in the brain, and that severe serotonin toxicity has occurred in people at 1 mg/kg. His conclusion was that all proposed uses of methylene blue seem to involve levels that block MAO.
Timing matters as well. Stanford, Stanford and Gillman revisited a case of severe delirium after parathyroid surgery in a patient who had stopped the antidepressant paroxetine two days before the operation and was then given methylene blue. They concluded that the reaction fit serotonin toxicity from the two drugs meeting (Stanford et al., 2010). A medicine you stopped recently can still be in play.
The Adderall label describes amphetamine’s action in terms of norepinephrine and dopamine, not serotonin. It still lists MAO inhibitors among the drugs that can cause serotonin syndrome with amphetamines. The risk is higher again for anyone who takes Adderall with an SSRI or SNRI antidepressant, because methylene blue would then meet two serotonin-raising medicines at once. Our guide to methylene blue and serotonin syndrome covers those cases in more depth.
Does a 5 mg supplement dose count?
This is where the evidence runs thin. The Adderall label names intravenous methylene blue, which hospitals give at 1 mg/kg or more. A 5 mg capsule is a much smaller dose, taken by mouth. Most published serotonin toxicity cases followed intravenous doses given in hospital, and no study has measured how strongly a 5 or 10 mg oral dose inhibits MAO-A in the brain.
Two facts argue against treating a small dose as safe. First, Ramsay and colleagues pointed out that methylene blue taken by mouth also meets MAO-A in the gut, where the enzyme breaks down amines from food. Second, the human brain studies that supplement buyers usually cite used a single 280 mg dose (about 4 mg/kg), and both excluded anyone who had taken a psychiatric medication in the previous five weeks (Rodriguez et al., 2016; Rodriguez et al., 2017). We found no trial that gave methylene blue to people taking a prescription stimulant.
So nobody can tell you where a safe threshold sits. When the downside is a stroke or serotonin syndrome and the upside is a supplement, the sensible rule is to keep the two apart unless your prescriber, who knows your full medicine list, decides otherwise.
How long to wait between methylene blue and Adderall
Methylene blue stays in the body for days. The prescribing information for injectable methylene blue gives a half-life of about 24 hours in humans (methylene blue injection prescribing information). In one Australian case, a 15-year-old given methylene blue in hospital after a mixed overdose of antidepressants and other medicines had a calculated half-life of 38 hours and developed severe serotonin syndrome that lasted five days (Chan et al., 2018). Our methylene blue half-life guide explains what those numbers mean for everyday doses.
Adderall clears faster. Its label gives a mean elimination half-life of about 10 to 11 hours for d-amphetamine and 11.5 to 13.8 hours for l-amphetamine. Using the usual rule that a drug is mostly gone after about five half-lives, that is roughly two to three days. The label does not set a gap for starting methylene blue after stopping Adderall, so that decision belongs to the doctor who manages your prescription.
| Your situation | What the sources say | What to do |
|---|---|---|
| You took methylene blue and want to start or restart Adderall | Adderall label (which names the intravenous form) and Drugs.com: at least 14 days off methylene blue first | Wait at least 14 days after your last dose and tell your prescriber you took it |
| You take Adderall and want to try methylene blue | No label sets a gap in this direction. Amphetamine’s half-life is about 10 to 14 hours | Only with your prescriber’s agreement, after any change to your stimulant is made under their care |
| You took both on the same day | Methylene blue’s half-life is about 24 hours, and 38 hours in one overdose case | Take no more methylene blue, call your prescriber or pharmacist before your next Adderall dose, and watch for the warning signs below |
Warning signs if you have already taken both
If you have taken methylene blue and Adderall close together, take no more methylene blue and watch yourself closely for the next two days. The two reactions look different, so it helps to know both. The blood pressure signs below come from the Drugs.com interaction text. The serotonin syndrome signs come from the Adderall label.
| Dangerously high blood pressure | Serotonin syndrome | |
|---|---|---|
| Signs | Sudden, severe headache, blurred vision, chest pain, nausea or vomiting, sweating, lightheadedness | Agitation, fast heartbeat, sweating, flushing, dizziness, tremor, twitching muscles, nausea, vomiting or diarrhea |
| Most serious signs | Confusion, seizures, sudden numbness or weakness on one side of the body, trouble speaking, fever, fainting | Hallucinations or confusion, high body temperature, rigid muscles, poor coordination, seizures, loss of consciousness |
| What to do | Call 911 | Call 911 |
Drugs.com advises immediate medical attention for any of the blood pressure signs. Call 911 for anything in the most serious row, and for any other sign in the table call 911 or Poison Control (1-800-222-1222 in the US) right away. Tell them exactly what you took and when. Do not try to ride out a pounding headache or chest pain at home, because methylene blue will still be in your system the next day.
Vyvanse, Strattera and Ritalin
The same question comes up for the other common ADHD medicines, and their labels point the same way.
- Vyvanse (lisdexamfetamine) is a prodrug of dextroamphetamine. Its label carries the same contraindication as Adderall: no use with an MAOI or within 14 days of stopping one, “including MAOIs such as linezolid or intravenous methylene blue” (Vyvanse prescribing information).
- Strattera (atomoxetine) is not a stimulant, but its label also rules out MAOIs, “including MAOIs such as linezolid or intravenous methylene blue,” and use within 14 days of stopping one (Strattera prescribing information).
- Ritalin (methylphenidate) is contraindicated with an MAOI or within 14 days of stopping one, because of the risk of hypertensive crises. Its label does not name methylene blue, but methylene blue is an MAO inhibitor, so apply the same caution (Ritalin prescribing information).
If you take any of these medicines, the answer is the same as for Adderall: do not add methylene blue without your prescriber’s agreement.
What blocks or changes Adderall absorption?
People who look up this interaction often ask a related question. The Adderall label lists a few groups of agents that change amphetamine levels:
- Acidifying agents, in the gut or the urine, lower amphetamine blood levels and can reduce its effect.
- Alkalinizing agents raise blood levels and strengthen its action, and the label says to avoid combining Adderall with alkalinizing agents in the gut.
- Proton pump inhibitors such as omeprazole make amphetamine reach its peak level sooner.
Methylene blue is not on that list. The trouble comes after absorption, when it slows the breakdown of the messengers amphetamine releases. Your Adderall dose stays the same while its effect on blood pressure and serotonin can grow. If you think something is changing how your Adderall works, ask your pharmacist.
Medications that should not be taken with methylene blue
Adderall is one of many. The prescribing information for injectable methylene blue carries a boxed warning against combining it with SSRIs, SNRIs, MAOIs and opioids because of serotonin syndrome, and its interaction section adds bupropion, buspirone, clomipramine, mirtazapine, linezolid and dextromethorphan. Apply the same caution at supplement doses. The main groups to avoid, or to clear with your prescriber first:
- Antidepressants named on the injection label: SSRIs, SNRIs, MAOIs, clomipramine, mirtazapine and bupropion.
- Stimulants: amphetamine medicines such as Adderall and Vyvanse, and methylphenidate.
- Opioids and the cough suppressant dextromethorphan.
- Other MAO inhibitors, including the antibiotic linezolid.
- Buspirone, and serotonin-raising supplements such as L-tryptophan and St John’s wort, which the Adderall label also lists as serotonergic.
This list is a starting point. Our methylene blue interaction reference sorts common drugs and supplements by risk, and our guide to who should not take methylene blue covers G6PD deficiency, pregnancy and the other reasons to skip it.
Methylene blue and ADHD: what has and has not been studied
No trial has tested methylene blue in people with ADHD, and it is not a substitute for prescribed medicine. The human evidence behind its brain effects is small. In the 2016 trial by Rodriguez and colleagues, 26 healthy adults took either a single 280 mg dose or a placebo. The methylene blue group showed more brain activity on functional MRI during attention and short-term memory tasks, and a 7% increase in correct memory-retrieval responses one hour after the dose. The 2017 follow-up used the same single dose and found stronger resting-state connectivity between brain regions involved in perception and memory.
Those were healthy volunteers taking one dose, with no stimulant or psychiatric medicine on board. The results say nothing about daily use alongside Adderall, and nothing about attention in people with a diagnosis. Our methylene blue and ADHD research guide goes through what has and has not been studied.
If you want to rely less on a stimulant, that is a conversation for your prescriber, who can adjust the dose or suggest another medicine. Methylene blue is not an Adderall replacement. For people who take no interacting medicine and want general support for mental energy, our roundup of energy and focus supplements without stimulants compares the options.
If you take no stimulant: using methylene blue carefully
Methylene blue can suit an adult who takes no stimulant, no serotonergic medicine and no other MAO inhibitor, who does not have G6PD deficiency, and who is not pregnant or breastfeeding. If that describes you, start low. One 5 mg methylene blue capsule in the morning, or 10 drops of our 1% methylene blue drops at 0.5 mg per drop, gives 5 mg. The methylene blue gummies hold 10 mg each with 25 mg of vitamin C, a larger first step. Our guide to how many mg of methylene blue per day explains how people adjust from there.
Expect your urine to turn blue or green. The dye passes into urine, and every participant who took methylene blue in the 2016 trial reported blue urine afterwards. Our methylene blue side effects guide covers the rest. Caffeine is a milder stimulant, and our page on methylene blue and caffeine looks at that pairing separately.
Whichever brand you choose, check what its testing covers. NooBlue publishes the Contract Testing Laboratories of America (CTLA) report on its methylene blue ingredient, with an HPLC identity result of “Conforms” and individual heavy metal results. That report covers the raw ingredient lot, not each finished batch. Our guide to methylene blue purity and USP grade explains what to look for, and you can compare all three formats in the NooBlue shop.
Questions to ask your prescriber
- Given the MAOI contraindication on my Adderall label, should I avoid methylene blue completely?
- If I stop Adderall, how long should I wait before trying methylene blue?
- If I take methylene blue and later need Adderall again, is a 14-day gap enough for me?
- Do any of my other medicines or supplements affect serotonin or blood pressure?
- What should I do if I take both by mistake?
Bring the bottle, or this page, so they can see the exact product and dose.
Methylene blue and Adderall: frequently asked questions
Can I take methylene blue if I’m on Adderall?
No. The Adderall label lists MAO inhibitors, naming intravenous methylene blue, as a contraindication because of the risk of hypertensive crisis, and it warns that amphetamines with MAO inhibitors can cause serotonin syndrome. No study has tested a small oral supplement dose with a stimulant, so there is no known safe amount. Ask your prescriber before taking any.
How long after methylene blue can I take Adderall?
At least 14 days after your last dose of methylene blue. That is the gap the Adderall label sets for any MAO inhibitor, and Drugs.com applies it to methylene blue by name. Tell your prescriber you took methylene blue before you restart.
How long after stopping Adderall can I take methylene blue?
No label sets that gap. Amphetamine’s half-life is about 10 to 14 hours, so most of it clears in two to three days, but the timing should come from the doctor who manages your prescription. Never stop a prescribed stimulant just to try a supplement.
Is methylene blue a stimulant like Adderall?
No. Methylene blue is a redox dye that inhibits MAO-A. Adderall is an amphetamine stimulant that releases norepinephrine and dopamine. They work differently, but they meet at the same neurotransmitters, which is why they should not be combined.
Can methylene blue make you test positive for amphetamine?
It has happened. A 2026 report in Therapeutic Drug Monitoring described two cases of false-positive amphetamine results on urine drug screening after methylene blue (Leegwater and Jager, 2026). Confirmation testing identifies the actual compound. If you take methylene blue and face a drug test, tell the lab. Our methylene blue drug test guide has the details.
Can people with ADHD use methylene blue instead of medication?
No. It has not been tested in people with ADHD, and it is not a replacement for prescribed medicine. The only human brain studies gave a single 280 mg dose to healthy adults who took no psychiatric medication. If you take Adderall, the interaction comes first: do not combine them.
What should I do if I took methylene blue and Adderall on the same day?
Take no more methylene blue and call your prescriber or pharmacist before your next Adderall dose. For the next two days, watch for a severe headache, chest pain, a racing heart, confusion, fever, sweating or stiff muscles, and call 911 if any of them appear. Poison Control is at 1-800-222-1222 in the US.
The bottom line
Methylene blue and Adderall should not be taken together. The Adderall label rules out MAO inhibitors, naming methylene blue, because the combination can cause a hypertensive crisis, and it also warns about serotonin syndrome. If you have taken methylene blue, wait at least 14 days before a stimulant and tell your prescriber. If you take no stimulant or serotonergic medicine and want to try methylene blue, start with a small fixed dose from a brand that shows you its testing.
This article is general information, not medical advice. Talk to your prescriber or pharmacist before taking methylene blue with any medicine.
Sources
- Adderall (dextroamphetamine saccharate, amphetamine aspartate, dextroamphetamine sulfate and amphetamine sulfate) tablets, prescribing information. Teva Pharmaceuticals USA. DailyMed.
- Vyvanse (lisdexamfetamine dimesylate), prescribing information. DailyMed.
- Strattera (atomoxetine), prescribing information. Eli Lilly and Company. DailyMed.
- Ritalin (methylphenidate hydrochloride) tablets, prescribing information. DailyMed.
- ProvayBlue (methylene blue) injection, prescribing information. American Regent. DailyMed.
- Drugs.com. Adderall and methylene blue drug interaction. drugs.com.
- Ramsay RR, Dunford C, Gillman PK. Methylene blue and serotonin toxicity: inhibition of monoamine oxidase A (MAO A) confirms a theoretical prediction. Br J Pharmacol. 2007;152(6):946-951. PubMed 17721552.
- Gillman PK. CNS toxicity involving methylene blue: the exemplar for understanding and predicting drug interactions that precipitate serotonin toxicity. J Psychopharmacol. 2011;25(3):429-436. PubMed 20142303.
- Stanford SC, Stanford BJ, Gillman PK. Risk of severe serotonin toxicity following co-administration of methylene blue and serotonin reuptake inhibitors: an update on a case report of post-operative delirium. J Psychopharmacol. 2010;24(10):1433-1438. PubMed 19423610.
- Chan BS, Becker T, Chiew AL, et al. Vasoplegic shock treated with methylene blue complicated by severe serotonin syndrome. J Med Toxicol. 2018;14(1):100-103. PubMed 29134498.
- Rodriguez P, Zhou W, Barrett DW, et al. Multimodal randomized functional MR imaging of the effects of methylene blue in the human brain. Radiology. 2016;281(2):516-526. PubMed 27351678.
- Rodriguez P, Singh AP, Malloy KE, et al. Methylene blue modulates functional connectivity in the human brain. Brain Imaging Behav. 2017;11(3):640-648. PubMed 26961091.
- Leegwater E, Jager NGL. Methylene blue-induced false-positive amphetamine results in urine drug screening: two case reports. Ther Drug Monit. 2026;48(2):280-281. PubMed 41058025.
