Lisdexamfetamine
Is It Right for You?
A complete guide to Lisdexamfetamine — what it treats, how it works, dosages, side effects, and when a clinician may prescribe it following an online consultation.
What Is Lisdexamfetamine?
Lisdexamfetamine is a stimulant medicine used to treat attention deficit hyperactivity disorder (ADHD). It improves attention, concentration, and self-control and reduces hyperactivity and impulsiveness.
It is a long-acting medicine taken once a day as a capsule. Lisdexamfetamine is an inactive prodrug that the body slowly converts into the active stimulant dexamfetamine, giving a smooth, all-day effect. It is available under the brand name Elvanse (Vyvanse in some countries).
Lisdexamfetamine is a controlled, prescription-only medication in the UK (Schedule 2). ADHD treatment with stimulants is started by a specialist, and a licensed clinician must review your diagnosis and medical history before it can be prescribed or continued.
What Conditions Is Lisdexamfetamine Used For?
Lisdexamfetamine is prescribed for:
as part of a comprehensive treatment programme when other measures alone are not enough.
improving focus and reducing impulsivity and restlessness.
for people already stabilised on stimulant therapy under specialist guidance.
Lisdexamfetamine is a controlled drug with a potential for misuse and dependence. It must only be taken by the person it is prescribed for, at the prescribed dose, and stored securely away from others.
How Does Lisdexamfetamine Work?
Lisdexamfetamine itself is inactive when swallowed. In the body it is gradually broken down to release dexamfetamine, the active stimulant. This slow conversion is what gives the medicine its long, steady duration of action.
Dexamfetamine increases the activity of two brain chemicals, dopamine and noradrenaline, in the areas that control attention and impulse. Boosting these messengers helps improve concentration and reduce hyperactivity.
Because the active drug is released slowly, lisdexamfetamine provides effects that last through much of the day from a single morning dose and may have a lower potential for misuse than immediate-release stimulants.
Dosages & Administration
The correct dose depends on the type and severity of infection, age, weight, and kidney function. Always follow your clinician's instructions. The table below is for general reference only.
Administration Tips
Take once in the morning, with or without food. Taking it late in the day can cause difficulty sleeping.
Swallow the capsule whole, or open it and stir the contents into a glass of water or soft food, then take it straight away.
Side Effects of Lisdexamfetamine
Stimulant side effects are common, especially when starting or increasing the dose. Many ease over time.
- Reduced appetite and weight loss
- Difficulty sleeping
- Dry mouth
- Headache
- Faster heartbeat
- Feeling anxious, irritable, or restless
- Raised blood pressure
- Chest pain, fainting, or breathlessness
- Signs of a heart problem or very fast/irregular heartbeat
- New or worsening mental health problems - aggression, psychosis, mania
- Painful, prolonged erection (priapism)
- Cold, painful, or discoloured fingers and toes
- Slowed growth in children
Stimulants can raise heart rate and blood pressure and may unmask or worsen mental health conditions. Heart health, blood pressure, mood, and (in children) growth must be monitored throughout treatment.
Drug Interactions
Always disclose all prescription drugs, over-the-counter medicines, vitamins, and supplements to your clinician or pharmacist before starting lisdexamfetamine.
Lisdexamfetamine must not be taken with, or within two weeks of, a monoamine oxidase inhibitor due to the risk of a dangerous rise in blood pressure.
Combining with serotonergic antidepressants can increase the risk of serotonin-related side effects.
Decongestants and other stimulants can add to effects on heart rate and blood pressure.
Caution is needed with drugs that can prolong the QT interval.
Substances that change urine acidity can alter how quickly dexamfetamine is cleared from the body.
Important Warnings
Lisdexamfetamine should not be used in people with serious heart problems. Tell your clinician about any heart disease, palpitations, or family history of sudden cardiac death before starting.
Stimulants can worsen anxiety, agitation, tics, or psychosis and are generally avoided in people with certain mental health conditions. Report any new mental health symptoms promptly.
As a controlled drug, lisdexamfetamine carries a risk of misuse and dependence. It must be stored securely and never shared. Tell your clinician about any history of drug or alcohol misuse.
Lisdexamfetamine is generally avoided in pregnancy and passes into breast milk. Tell your clinician if you are pregnant, planning pregnancy, or breastfeeding.
Speak to a Clinician About Treatment
Getting advice no longer means sitting in a waiting room. Through The GP Service, you can consult with a licensed clinician in minutes — from home, on your lunch break, or wherever works for you. If treatment is clinically appropriate, your clinician can issue a prescription during the consultation. A consultation does not guarantee a prescription.
The treatment you need, when you need it.
Lisdexamfetamine FAQs
Stimulant ADHD treatment is started by a specialist and is a controlled medicine. A licensed clinician can review your diagnosis and history through a telehealth consultation and may prescribe or continue it where clinically appropriate, with required monitoring.
Lisdexamfetamine is an inactive prodrug that the body slowly turns into dexamfetamine. This gives a smoother, longer-lasting effect from a single daily dose.
Because it must be converted in the body, the effect builds over a couple of hours and lasts much of the day. Benefits to focus are usually noticeable on the day of dosing once the right dose is found.
Alcohol is best avoided or strictly limited, as it can mask the stimulant's effects and increase strain on the heart. Discuss your situation with your clinician.
Skip the missed dose and take your next one the following morning. Do not take it later in the day, as it can disturb sleep, and never double up.
Reduced appetite and difficulty sleeping are common. Taking the dose early, eating regular meals, and keeping a consistent bedtime can help. Tell your clinician if these are troublesome.
Speak to your clinician before stopping. While lisdexamfetamine does not usually need a strict taper, stopping can cause tiredness or low mood, and your ADHD treatment should be reviewed.