Lisdexamfetamine
Brand: Elvanse
Overview
Medication class
Stimulant: lisdexamfetamine dimesylate, a of dexamfetamine.
When it's prescribed
First-line for adults with ADHD in the UK. You do not need to have tried methylphenidate first; this requirement only applies to children. Also licensed for children aged 6 and over and adolescents.
Typical duration
Up to 12–14 hours from a single morning dose.
Available strengths
20, 30, 40, 50, 60, 70 mg capsules. Maximum licensed dose: 70 mg/day.
Key advantages
- Once-daily dosing: no midday top-up required
- Smooth onset and offset, fewer peaks and troughs
- Lower misuse potential than immediate-release stimulants
- Capsule can be opened and mixed with water, orange juice, or yogurt: all work identically
- Adults do not need to fail on methylphenidate first
Key cautions
- Appetite suppression, particularly in the afternoon: eat breakfast before it takes effect
- Cardiovascular monitoring required before and during treatment
- Controlled drug (Schedule 2): stricter prescription rules; keep it secure and never share it
- Cannot be taken within 14 days of stopping an MAOI antidepressant
- Not suitable with certain heart conditions, hyperthyroidism, or active psychosis
How it works
Lisdexamfetamine, also commonly known as the brand Elvanse, is a prodrug; it arrives in your stomach inactive. Your body then slowly converts it into the active ingredient (dexamfetamine) inside your red blood cells. Because this happens gradually, the effect builds up over an hour or two and wears off gently later in the day, without the sharp peaks and troughs of some other stimulants.
Once absorbed, dexamfetamine boosts two brain chemicals in the areas most affected by ADHD. Dopamine is your brain's "is this worth doing?" signal: low dopamine is why starting tasks feels genuinely hard. Noradrenaline is your brain's signal-to-noise filter; it helps the planning part of your brain focus on what matters and filter out distractions. Unlike some medications that only block reabsorption of these chemicals, dexamfetamine actively pushes more of them into the synapse: which is why the effect is noticeable and why the dose is carefully titrated.
This is helpful for ADHD symptoms such as impulsivity, emotional reactivity, poor task initiation and reward-driven behaviours, such as binge eating, impulse spending or constantly seeking stimulation.
However, because dexamfetamine can have a stronger releasing effect on dopamine and noradrenaline, some people may experience more side effects, such as poor sleep, vivid dreams, feeling overstimulated, or circulation-related symptoms such as cold fingers, colour changes or Raynaud’s-type symptoms. If this happens, and it is clinically appropriate, a trial of methylphenidate may be considered, as it can still improve ADHD symptoms but may be better tolerated for some people.
Lisdexamfetamine dimesylate is a lysine-conjugated prodrug of d-amphetamine. After oral administration, enzymatic hydrolysis: primarily by red blood cell peptidases: cleaves the lysine moiety, releasing active d-amphetamine. The rate-limited conversion provides a slower, more controlled rise in plasma amphetamine levels compared to immediate-release dexamfetamine formulations.
d-Amphetamine acts as a releasing agent and reuptake inhibitor of dopamine and noradrenaline in presynaptic neurons, and to a lesser extent serotonin. It also inhibits monoamine oxidase. The net effect is substantially increased monoaminergic neurotransmission in prefrontal cortical circuits involved in executive function, attention, and impulse regulation.
The prodrug mechanism confers reduced misuse liability: non-oral administration (e.g. intranasal) attenuates enzymatic conversion and blunts the euphoric response. Clinically relevant where misuse risk is a consideration.
How to take it
When to take it
Once each morning, ideally between 7am and 9am, at a consistent time. Taking it after 10–11am often makes sleep harder that night.
With or without food
Usually recommend with or after a decent breakfast for two reasons. Firstly, some people find it feels smoother and is better tolerated when taken after food. Food does not reduce how much medication is absorbed, but it can slightly delay the peak effect, so it may feel less abrupt for some people. Secondly, Elvanse commonly reduces appetite, so having breakfast first means you have already had a proper meal before the appetite suppression starts. Bonus tip: a higher-protein breakfast can be helpful for ADHD. Protein provides amino acids, which your body uses to help make neurotransmitters such as dopamine and noradrenaline. This can help support steadier energy, concentration and appetite control through the day.
Swallowing the capsule
Swallow whole with water, or open the capsule and stir the contents into a glass of water, orange juice, or yogurt. Drink or eat straight away. Don't crush or chew. All three mixing options are clinically identical in effect.
Missed dose
Before noon → take it when you remember. After noon → skip that day and take your normal dose tomorrow. Never double up.
Titration period
Almost always started at 20 or 30 mg and increased every 2–4 weeks. This isn't a sign it 'isn't working': it's your prescriber finding the lowest dose that gives you the best benefit with the fewest side effects. Most people reach their target dose within 6–12 weeks.
Don't combine with
MAOIs (a type of antidepressant): absolute no: cannot be taken within 14 days of stopping one. SSRIs and SNRIs: usually fine, but do carry the risk of Seretonin Syndrome, so speak to your prescriber. Large amounts of vitamin C (orange juice is fine) around the time of your dose: can reduce absorption. Antacids or sodium bicarbonate (e.g Gaviscon, Remmies etc.): can increase absorption. Always tell your prescriber and pharmacist about everything you take.
Drug testing
Elvanse converts to dexamfetamine in the body, so it will produce a positive result for amphetamines on any standard drug test: urine, saliva, or blood. This applies to workplace, legal, sporting, and roadside testing. Carry your prescription or a letter from your prescriber. The law provides a statutory medical defence for roadside tests if you are taking a prescribed dose and are not impaired.
Licensed doses in the UK: 20, 30, 40, 50, 60, 70 mg. Titration typically begins at 20–30 mg daily, with increments of 10–20 mg at intervals of no less than one week, guided by response and tolerability. Maximum licensed dose: 70 mg daily.
Measure blood pressure and heart rate at baseline and after each dose increase, then at least every six months once stable. Monitor weight and height in children. Ask about personal or family history of cardiac conditions, arrhythmias, or sudden cardiac death before initiation. A resting ECG is not routinely required but should be considered where there is clinical concern.
Schedule 2 Controlled Drug under the Misuse of Drugs Regulations 2001. Prescriptions must comply with controlled-drug requirements (quantity in words and figures, no repeats). Cannot be prescribed on FP10MDA (instalment) forms for ADHD.
What to expect: week by week
First impressions
Many people notice something different quickly: improved focus, less mental noise, a sense of calm. Some feel nothing obvious at the starting dose: that's also normal. Appetite often drops straight away.
Settling in
Effects become more predictable. You'll start to notice when it kicks in and when it wears off. Mild headaches and reduced appetite are common: both usually ease. Sleep may be disrupted if you dose too late.
Finding your rhythm
Most people find a pattern that works for them. The initial side effects (headache, nausea, dry mouth) often settle by now. You may notice a 'rebound': feeling quieter or more emotionally sensitive as the dose wears off. Worth mentioning at your next review.
Established effect
Consistent, manageable focus through the day. It shouldn't feel like a different you: more like things that were always hard becoming slightly more accessible.
Side effects & what helps
All expanded by default: tap a category to collapse it. Most of these ease in the first 1–2 weeks.
Reduced appetite during the day
Very commonWhat helps
Eat a substantial breakfast before the medication takes effect. Plan a proper meal in the evening when appetite usually returns. If suppression is significantly affecting weight, speak to your prescriber.
Nausea, particularly in the first week
CommonWhat helps
Take with food in the morning during the first two weeks. Usually settles within 7–10 days.
Difficulty falling asleep
CommonWhat helps
Take your dose as early in the morning as possible. Avoid caffeine after midday. Melatonin is sometimes prescribed alongside ADHD medication: speak to your prescriber if ongoing.
Feeling tired when medication wears off
CommonWhat helps
A predictable evening dip is normal as medication clears. Planning low-demand activities in the late afternoon can help.
Emotional sensitivity or irritability as dose wears off
CommonWhat helps
Sometimes called a rebound effect. Worth tracking whether it's consistent: mention to your prescriber as dose or timing adjustments sometimes help.
Feeling unusually flat or emotionally blunted
Less commonWhat helps
If emotions feel too muted or you feel unlike yourself, discuss at your next review. A dose reduction often resolves this.
Suicidal thoughts
UncommonWhat helps
Contact your prescriber or crisis support immediately. Do not wait for a routine appointment.
Headaches, particularly in the first 1–2 weeks
CommonWhat helps
Stay well hydrated; this is the most effective step. Aim for 6–8 glasses of water daily. Paracetamol is safe alongside Elvanse.
Dry mouth
CommonWhat helps
Sip water regularly. Sugar-free gum or mints can help.
Constipation or stomach discomfort
Less commonWhat helps
Maintain adequate fluid and fibre intake. If persistent, mention at your next review.
Mildly increased heart rate or blood pressure
CommonWhat helps
A small rise (typically 5–10 bpm) is an expected pharmacological effect. Monitored at every review. Contact your prescriber if you notice a pounding or racing heartbeat at rest.
Tics (repeated movements or sounds): new or worsening
UncommonWhat helps
Tell your prescriber before starting Elvanse if you have a personal or family history of tics or Tourette's; this is caution requiring assessment, not an automatic exclusion. If tics appear or worsen on treatment, contact your prescriber for review.
Raynaud's phenomenon (fingers or toes going pale or cold)
RareWhat helps
Contact your prescriber.
Priapism (painful erection lasting more than 2 hours)
Rare: medical emergencyWhat helps
Attend A&E immediately.
When to seek help
Expected adjustment effects
Common in the first few weeks: no action usually needed
- Reduced appetite during the day
- Mild headaches, particularly in week one
- Dry mouth
- Feeling more talkative or slightly energised
- Nausea in the first week
- Mild difficulty falling asleep if still adjusting timing
- Emotional dip as medication wears off in the evening
Contact your prescriber within a few days
Not urgent: but worth discussing if ongoing
- Persistent sleep problems (more than 2–3 weeks)
- Significant weight loss or inability to eat
- Feeling emotionally blunted or unlike yourself
- Noticeable low mood, anxiety, or tearfulness not settling
- Irritability or agitation affecting relationships
- Tics (repetitive movements or sounds): new or worsening
- Persistent headaches beyond the first two weeks
- Raynaud's symptoms; blurred vision
Contact prescriber or 111 today
Do not wait for a routine appointment
- Chest pain, tightness, or irregular heartbeat at rest
- Resting HR consistently above 120 bpm; BP significantly raised; fainting
- Signs of very high blood pressure (severe headache, vision changes, confusion)
- Hallucinations or loss of touch with reality
- Thoughts of self-harm or suicide
- Seizures (if no prior history)
- Severe allergic reaction: rash, facial swelling, difficulty breathing
- New mania
What you can safely try while waiting for a review
- Drink more water: dehydration worsens nearly all stimulant side effects
- Eat breakfast before the medication kicks in
- Move your dose 30 minutes earlier if sleep is affected
- Keep a brief daily note of symptoms, timing, and mood: invaluable at reviews
- Reduce caffeine, particularly after midday
- Plan lower-demand activities for the late afternoon when energy dips
- Paracetamol is safe for headaches if needed
Frequently asked questions
Ask your prescriber
Questions worth raising at your next review. You don't need to cover all of them: pick the ones that feel most relevant.
- Are there any monitoring checks I'm due: blood pressure, pulse, weight?
- Do I need to have tried methylphenidate first, or can we go straight to Elvanse?
- Am I on the right type of stimulant: could a different formulation suit me better?
- Are any of my other medicines interacting with Elvanse?
- I have a history of tics: is Elvanse still an option?
- What should I do if my prescription runs out before my next appointment?
- Is there anything I should avoid eating, drinking, or taking at the same time?
- If I want to take a break from the medication, how should I do this safely?
- What would be the signs that Elvanse isn't the right medication for me?
- Are you pregnant, planning a pregnancy, or has anything changed with contraception?
For GPs & clinicians
Elvanse is licensed as first-line for adults in the UK. The NICE NG87 requirement to try methylphenidate first applies to children only. Adult patients do not need to have failed on methylphenidate before Elvanse can be prescribed.
Obtain pre-treatment blood pressure and heart rate. A resting ECG is not required routinely but should be considered where there is a personal or family history of cardiac abnormalities, or where the patient reports palpitations on treatment. Elvanse should be used with caution in hypertension; it is contraindicated in significant structural heart disease or uncontrolled hypertension.
Pre-existing tics or Tourette's syndrome are not an absolute contraindication. Assess individually, counsel appropriately, and monitor. If tics emerge or worsen during treatment, review and consider dose adjustment or medication change.
The rate-limited enzymatic conversion of lisdexamfetamine to d-amphetamine results in a flatter plasma concentration curve and a lower abuse signal compared with immediate-release amphetamine salts. This makes Elvanse pharmacologically preferable where misuse risk is a clinical consideration, though it remains a Schedule 2 Controlled Drug.
Start at 20–30 mg daily. Increase by 10–20 mg at intervals of no less than one week, guided by tolerability and clinical response. Maximum licensed dose: 70 mg daily. Most adults respond optimally at 50–70 mg.
Avoid concomitant use with MAOIs or within 14 days of stopping an MAOI: risk of hypertensive crisis. Alkalinising agents (including high-dose sodium bicarbonate or some antacids) may increase amphetamine absorption. Use with serotonergic agents warrants caution due to serotonin syndrome risk.
Elvanse does not require a formal taper in most clinical situations: no physical dependence. However, abrupt discontinuation after prolonged use at higher doses may be associated with temporary fatigue, low mood, or increased appetite. Counsel patients on the readjustment effect (not withdrawal). A brief taper may be preferable for comfort if the patient has been on high doses long-term.
Pregnancy (BUMPS/UKTIS): Do not advise abrupt discontinuation. Individual risk-benefit assessment. Third-trimester use may affect fetal growth; neonatal withdrawal symptoms possible.
Breastfeeding (BfN April 2025): Elvanse passes into breast milk. Less well-studied than methylphenidate during breastfeeding. Methylphenidate preferred where possible: particularly for babies under 8 weeks or exclusively breastfed. If continuing Elvanse, monitor infant for CNS stimulation. Do not advise automatic cessation of breastfeeding: individual decision with specialist input.
This guide is written for educational purposes and does not constitute medical advice. Always follow the guidance of your prescriber or pharmacist. If you have concerns about your medication, contact your clinical team.