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Adderall XR and Metformin Interaction: What You Need to Know

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Key numbers

  • 30 mL/min/1.73 m2Metformin is contraindicated when eGFR falls below this level (severe renal impairment)Source: dailymed.nlm.nih.gov, as cited 2026-11-07
  • 14 daysAdderall XR is contraindicated during monoamine oxidase inhibitor use or within this period after stopping oneSource: accessdata.fda.gov, as cited 2026-11-07
  • 10%Adults with weight loss on Adderall XR in placebo-controlled trials (placebo: 0%)Source: accessdata.fda.gov, as cited 2026-11-07
  • 53%Metformin-treated patients with diarrhea, its most common adverse reaction (placebo: 12%)Source: dailymed.nlm.nih.gov, as cited 2026-11-07

At a glance

  • Documented interaction / Glucose control: the metformin label names sympathomimetics as drugs that can raise glucose [1]
  • Metformin label instruction / Observe closely for loss of glucose control when such a drug is given, and for hypoglycemia when it is withdrawn [1]
  • Adderall XR contraindications / Hypersensitivity, and monoamine oxidase inhibitor use during or within 14 days of stopping one [2]
  • Metformin contraindications / eGFR below 30 mL/min/1.73 m2, hypersensitivity, metabolic acidosis [1]
  • Blood pressure and heart rate / Adderall XR can raise both, with larger increases in some people [2]
  • Appetite / Loss of appetite and weight loss are reported adverse effects of Adderall XR [2]

Is there a direct interaction between Adderall XR and metformin?

Metformin's contraindications are severe renal impairment with an eGFR below 30 mL/min/1.73 m2, hypersensitivity to metformin, and acute or chronic metabolic acidosis including diabetic ketoacidosis [1]. Adderall XR's contraindications are hypersensitivity and use of a monoamine oxidase inhibitor during treatment or within 14 days of stopping one [2].

Metformin's interaction table covers carbonic anhydrase inhibitors such as topiramate and zonisamide, drugs that interfere with the renal tubular transport systems that eliminate metformin (ranolazine, vandetanib, dolutegravir, cimetidine), alcohol, insulin and insulin secretagogues, and a general entry for drugs that affect glycemic control [1]. Amphetamine is not named individually in that table. It would fall under the sympathomimetic entry, which is a glucose warning rather than a clearance problem [1].

The interaction that is written down: blood sugar

The metformin label states that certain drugs tend to produce hyperglycemia and may lead to loss of glycemic control. When such a drug is given to a patient on metformin, the patient should be observed closely for loss of blood glucose control. When the drug is withdrawn, the patient should be observed closely for hypoglycemia. Sympathomimetics are on that list, alongside thiazides and other diuretics, corticosteroids, phenothiazines, thyroid products, estrogens, oral contraceptives, phenytoin, nicotinic acid, calcium channel blockers and isoniazid [1].

Amphetamines are sympathomimetic amines, so Adderall XR belongs to the class the metformin label names. The label entry is a monitoring instruction, not a contraindication, and it does not put a size on the effect [1][2].

Questions worth asking

Choose the questions you want to keep

Appetite, weight and mealtime glucose

Loss of appetite and weight loss are reported adverse effects of Adderall XR. In the label's placebo-controlled trials, weight loss occurred in 4% of children 6 to 12 on Adderall XR versus 0% on placebo, and in 10% of adults versus 0% [2]. Metformin also lowered weight in the Diabetes Prevention Program: weight fell 2.06% with metformin versus 0.02% with placebo during the double-blind phase [3].

Metformin's most common adverse reaction is diarrhea, reported in 53% of metformin-treated patients versus 12% on placebo and leading to discontinuation in 6% [1]. The label directs dosing with meals [1]. HealthRX.com offers metformin by prescription.

Blood pressure and heart rate

Adderall XR can raise blood pressure and heart rate, with larger increases in some people, and the label says to monitor them [2]. Those cardiovascular warnings apply whether or not metformin is taken [2].

Kidney function

Renal impairment is the main risk factor for metformin-associated lactic acidosis, and the metformin label contraindicates metformin below an eGFR of 30 mL/min/1.73 m2. It says to obtain an eGFR before starting and at least annually, not to start between 30 and 45, and to reassess benefit and risk if eGFR later falls below 45 [1]. The label also says metformin should be temporarily discontinued during surgery and other procedures that restrict food and fluid intake [1].

What the two labels do and do not settle

Together the labels give a monitoring picture: watch glucose when a sympathomimetic is given or withdrawn, watch blood pressure and heart rate on the stimulant, and check kidney function on metformin [1][2]. They give no measured size for any of those effects when the two drugs are used together.

Dr Rossi on why extended release suits long-term psychiatric medicines

Dr Rossi explains that extended release keeps the same active medication but changes the delivery so it releases slowly, giving steadier blood levels rather than a sharp peak. He sees once-daily dosing as a real advantage because it is easier for patients to remember, which supports adherence. He notes the main drawback is higher cost, and says he does not really see extended release causing more side effects in practice. In his clinical view, he prefers extended release for medicines meant as long-term maintenance, while immediate release can suit acute needs.

Who is speaking?

Dr Rossi. Psychiatry-focused channel host, as described on the Shrinks In Sneakers channel Background

Episode notes and full video

Frequently asked questions

Can you take Adderall XR and metformin together?
Neither label lists the other drug as a contraindication. Metformin's are severe renal impairment with an eGFR below 30 mL/min/1.73 m2, hypersensitivity to metformin, and metabolic acidosis [1]. Adderall XR's are hypersensitivity and use of a monoamine oxidase inhibitor during or within 14 days of stopping one [2]. The metformin label does name sympathomimetics as a class that can raise glucose and cause loss of glycemic control [1].
Can Adderall XR raise blood sugar while on metformin?
The metformin label treats sympathomimetics as a class that can produce hyperglycemia and loss of glycemic control. It says to observe closely for loss of glucose control when such a drug is given and for hypoglycemia when it is withdrawn [1]. Amphetamines are sympathomimetic amines [2]. The label does not put a number on the effect [1].
Does metformin change how amphetamine is cleared?
The metformin label says metformin is not metabolized and is cleared by the kidneys [1]. The clearance interactions it lists concern drugs that interfere with the renal tubular transport systems that eliminate metformin, such as ranolazine, vandetanib, dolutegravir and cimetidine, and amphetamine is not named among them [1].
What kidney checks does metformin require?
The label says to obtain an eGFR before starting and at least annually, contraindicates metformin below 30 mL/min/1.73 m2, does not recommend starting between 30 and 45, and says to reassess benefit and risk if eGFR falls below 45 [1].
Do the labels give a timing rule for taking the two drugs?
Adderall XR's contraindications concern hypersensitivity and monoamine oxidase inhibitors, not timing with other drugs [2]. The metformin label directs dosing with meals and lists no timing interaction with amphetamines [1].

What people actually ask

What are the potential interactions between Adderall and metformin?

The labels show no direct contraindication between the two drugs. The one written interaction is a blood sugar warning: the metformin label names sympathomimetics as drugs that can produce hyperglycemia and loss of glycemic control, and says to observe closely when such a drug is given or withdrawn. The label gives no measured size for the effect.

What not to mix with Adderall XR?

Adderall XR's label lists two contraindications: hypersensitivity to the drug, and use of a monoamine oxidase inhibitor during treatment or within 14 days of stopping one. Neither label lists the other drug as a contraindication. The metformin label also names sympathomimetics, a class that includes amphetamines, as drugs that can raise glucose, and says to observe glucose closely when such a drug is given or withdrawn.

What drugs interact badly with metformin?

The metformin label's interaction table names carbonic anhydrase inhibitors such as topiramate and zonisamide, and drugs that interfere with the renal tubular transport systems that eliminate metformin, such as ranolazine, vandetanib, dolutegravir and cimetidine. It also lists alcohol, insulin and insulin secretagogues, and sympathomimetics, which include amphetamines, as drugs that affect glucose control.

References

  1. U.S. National Library of Medicine, DailyMed. Metformin hydrochloride tablets (Granules, immediate-release) prescribing information. Metformin hydrochloride tablets (Granules, immediate-release) label
  2. Drugs@FDA: FDA-Approved Drugs. Drugs@FDA: FDA-Approved Drugs
  3. Diabetes Prevention Program Research Group. Long-term safety, tolerability, and weight loss associated with metformin in the Diabetes Prevention Program Outcomes Study. Diabetes Care. 2012;35(4):731-7. Long-term safety, tolerability, and weight loss associated with metformin in the Diabetes Prevention Program Outcomes Study
  4. Shrinks In Sneakers. Immediate Release Vs Extended-Release Formulations in Psychiatry. Accessed 2026-11-11.
Evidence overview for interactions adderall: Adderall XR and Metformin Interaction: What You Need to Know