Yes, weight often drops, and here's why
Vyvanse (lisdexamfetamine) is a stimulant. Lower appetite is one of its most common side effects, and weight loss shows up in the label's adverse reaction tables. In children, prescribers watch growth for this reason.
For many people, the appetite effect is strongest during the hours the medicine is active and eases by evening. How much weight changes varies a lot from person to person.
What the label says about weight
Decreased appetite and weight loss are listed among the common side effects in the label. In children, prescribers track height and weight, because stimulants can slow growth during treatment. Some children take planned breaks under medical guidance.
If you're losing too much
For people who are already lean, a lighter appetite can become a problem. Ideas many families and adults use, with their prescriber's input:
- Eat a hearty breakfast before the dose kicks in
- Plan a filling snack or meal in the evening when the effect wears off
- Choose calorie-dense foods like nut butters, yogurt, cheese and smoothies
- Tell the prescriber about steady weight loss, since dose or timing may need a change
Adults also commonly report decreased appetite, and some lose weight they didn't need to lose. Weighing in every few weeks and sharing the trend with your prescriber is a simple safeguard.
What it's approved for
Vyvanse is FDA-approved for:
- ADHD in people 6 and older
- Moderate to severe binge-eating disorder in adults
The label states it isn't for weight loss or obesity. Other stimulants used for weight loss in the past caused serious heart problems, and Vyvanse's safety for that use hasn't been established.
It isn't approved for binge-eating disorder in children, and it isn't approved for obesity at any age.
Vyvanse and binge-eating disorder
Binge-eating disorder means regular episodes of eating a large amount of food with a sense of losing control, often followed by distress. It's the most common eating disorder in the US.
In the trials that led to approval, adults taking Vyvanse had fewer binge days per week than adults on placebo. The goal was fewer binges, not weight loss. Therapy, especially cognitive behavioral therapy, is also well studied, and many people use both.
If eating feels out of control, you deserve support without judgment. Our post on emotional eating explains how comfort eating differs from binge eating.
The boxed warning
Vyvanse carries a boxed warning for abuse, misuse and addiction, which can lead to overdose. Your prescriber should check your risk before and during treatment. Taking someone else's prescription to lose weight is unsafe and illegal.
Vyvanse is a Schedule II controlled substance. Store it safely, never share it, and get rid of leftover capsules through a take-back program. Your prescriber may check in on how you're using it at each visit.
Side effects and who should be careful
Common side effects in adults include decreased appetite, trouble sleeping, dry mouth, a faster heart rate, anxiety and feeling jittery. Stimulants can also raise blood pressure.
Tell your prescriber if you have:
- Heart disease, a heart rhythm problem or high blood pressure
- A personal or family history of substance use
- Bipolar disorder, psychosis or a history of depression
- Circulation problems in the fingers or toes, such as Raynaud's
- Taken an MAO inhibitor in the past 14 days, which rules Vyvanse out
If you also take a GLP-1
Some adults take a stimulant and a GLP-1 medicine. Both can lower appetite, so eating enough can become the challenge. Plan regular meals, lead with protein and watch for dizziness, fatigue or fast weight loss. Your protein target makes a helpful daily anchor. Tell both prescribers about each medicine.
Safer routes if weight is the goal
If you're living with obesity or weight-related health conditions, there are medicines made and studied for that, from older options to GLP-1s. Check where you stand with the BMI and eligibility calculator.
Weight-management medicines are generally for adults with a BMI of 30 or higher, or 27 or higher with a weight-related condition such as high blood pressure or type 2 diabetes. They work best alongside a modest calorie deficit and regular activity.
When to talk to your doctor
- Your child's appetite or growth changes on Vyvanse
- You have chest pain, a racing heart or fainting
- You notice mood changes, new anxiety or trouble sleeping
- You want help with weight. Ask about options approved for it
Run your numbers
Keep reading
Common questions
Is Vyvanse used for weight loss?
No. The label says it's not for weight loss or obesity, even though decreased appetite is a common side effect.
Why is Vyvanse approved for binge eating but not weight loss?
It was studied and approved to reduce binge-eating days in adults with binge-eating disorder. Its safety and benefit for weight loss weren't established.
Will I gain weight back if I stop Vyvanse?
Appetite often returns when a stimulant is stopped, so some weight may come back. Talk with your prescriber before stopping.
Sources
Clinician review pending. Drafted from primary sources and waiting for sign-off by a licensed clinician (MD, DO or PharmD) before launch. Every number is checked against its source. Drug facts are re-checked quarterly, prices monthly and whenever a label changes. How we review · Report an error