Lisdexamfetamine (Vyvanse)

What it treats

Lisdexamfetamine is approved by the U.S. Food and Drug Administration to treat attention-deficit hyperactivity disorder, usually shortened to ADHD. It is also approved to treat moderate to severe binge eating disorder in adults.

ADHD is the main reason it is prescribed. Stimulants are first-line medications for ADHD because they work well for most people who take them, and lisdexamfetamine is a widely used option.

How it works

Lisdexamfetamine is a stimulant, and it is a prodrug. A prodrug is inactive as you take it, and the body gradually converts it into the active medication. Here, that active form is a stimulant.

The active form increases the availability of dopamine and norepinephrine, two chemical messengers in the brain involved in attention and focus. Because the conversion from prodrug to active drug is gradual, the effect comes on smoothly and lasts a long time, without a sharp peak. This design also makes lisdexamfetamine somewhat harder to misuse than a fast-acting stimulant.

What to expect

Common side effects

Most people get some side effects, especially early on. The common ones include:

• Reduced appetite, and some weight loss.
• Trouble sleeping.
• Dry mouth.
• Headache.
• Irritability.
• A faster heartbeat.
• Feeling anxious or jittery.

Appetite and sleep effects are the ones people notice most. Taking the dose in the morning helps limit sleep problems. If a side effect is severe, or it isn't easing, that is a conversation to have with the prescriber rather than a reason to stop on your own.

Serious side effects and warnings

Serious problems are uncommon, but a few are worth knowing.

Boxed warning. Stimulant medications like lisdexamfetamine carry an FDA boxed warning about a potential for misuse, abuse, and addiction. Lisdexamfetamine is a Schedule II controlled substance, the category for medications that have a recognized medical use and a high potential for misuse. This is a real point to understand, not a reason for alarm. Used as prescribed and monitored by a clinician, lisdexamfetamine has a strong record as an ADHD treatment.

• Cardiovascular effects. Stimulants raise heart rate and blood pressure. Caution is needed for people with serious heart conditions, and a prescriber will usually check heart health before starting.
• Anxiety and agitation. It can worsen anxiety, agitation, or jitteriness in some people.
• Psychotic symptoms. Rarely, a stimulant can bring on or worsen psychotic symptoms, such as hearing or seeing things that are not there.
• Growth in children. In children, stimulants can slightly slow growth, so height and weight are monitored over time.
• History of substance use. Caution is needed for anyone with a past or present substance use problem, and this is worth discussing openly with the prescriber.

Sexual side effects

Lisdexamfetamine is not a notable cause of sexual side effects. This is one area where it differs from some other psychiatric medications. If you do notice a change, it is still worth raising with your prescriber.

Weight, appetite, and sleep

Lisdexamfetamine reduces appetite, and some people lose weight while taking it. For most people the appetite effect is strongest early on. Eating on a regular schedule, including before the dose takes full effect, can help.

It can also cause trouble sleeping. That is the main reason it is taken in the morning. Taking it later in the day makes sleep problems more likely.

Starting and dosing basics

This section is general background, not a dosing instruction for any individual. The right dose is a decision for a prescriber.

Lisdexamfetamine comes as capsules and as chewable tablets. The capsules can be swallowed whole, or opened and the contents dissolved in liquid. It is taken once daily in the morning. Prescribers usually start at a low dose and adjust gradually based on response and tolerability.

Missed doses and interactions

If you miss your morning dose, the general guidance is to take it when you remember, as long as it is still early enough in the day. Never take a dose late in the day to make up for a missed one, because it can cause trouble sleeping. Don't take two doses to make up for one.

Lisdexamfetamine must not be combined with MAOI antidepressants. Give every prescriber and pharmacist a full list of your medications and supplements.

Because it is a Schedule II controlled substance, prescriptions work differently. They cannot be refilled in the usual way, so a new prescription is needed each time. The rules for prescribing controlled substances, including through telehealth, are stricter than for other medications and can vary by state. It helps to plan ahead so you don't run out.

Stopping and tapering

Lisdexamfetamine does not need a long taper the way some other medications do. Even so, stopping is best coordinated with a prescriber. Some people notice tiredness or low mood for a short time after stopping, as the body adjusts. A prescriber can help plan the timing and tell you what to expect.

Pregnancy and breastfeeding

This is an area where individual circumstances matter and the decision belongs with a clinician. Untreated ADHD and the medication each carry their own considerations during pregnancy and breastfeeding. There is no single answer that fits everyone. Anyone who is pregnant, planning a pregnancy, or breastfeeding should talk it through with their prescriber so the specific risks and benefits can be weighed for their situation.

Cost and generic availability

Lisdexamfetamine was available only as the brand Vyvanse for many years. A generic is now available, which has lowered the cost for many people. The brand Vyvanse and generic lisdexamfetamine contain the same active medication and work the same way. Coverage and price still vary by insurance plan and pharmacy.

Common questions

How is Vyvanse different from Adderall? Both are stimulants for ADHD. Vyvanse is a prodrug, so the body has to convert it to the active form, which gives a smoother, longer effect. Adderall is active as taken. The right choice depends on the person.

What does prodrug mean? A prodrug is inactive when you take it. The body gradually converts it into the active medication. That gradual conversion is why lisdexamfetamine comes on smoothly and lasts a long time.

Is it addictive? It carries a recognized potential for misuse and is a controlled substance. Used as prescribed and monitored by a clinician, it has a strong record as an ADHD treatment. Tell your prescriber about any history of substance use.

How long does it last? A single morning dose lasts most of the day for most people.

Why can't the prescription be refilled like other medications? It is a Schedule II controlled substance. By law these prescriptions cannot be refilled in the usual way, so a new prescription is needed each time. Planning ahead helps avoid gaps.

Questions to ask your prescriber

• What are we hoping this treats, and how will we know it's working?
• Which side effects should I expect, and which ones should I call about?
• How should I handle getting a new prescription each month?
• What should I do about appetite or sleep changes?
• If we decide to stop it later, how would we do that?

Sources

This guide draws on current prescribing information and public health references. It is reviewed for clinical accuracy and updated as guidance changes.

• U.S. Food and Drug Administration. Lisdexamfetamine dimesylate (Vyvanse) prescribing information.
• MedlinePlus, U.S. National Library of Medicine. Lisdexamfetamine.
• National Institute of Mental Health. Mental health medications.