Key facts
Medicines in this group
Methylphenidate, lisdexamfetamine, dexamfetamine
Onset
Usually within about an hour
Duration
3 to 14 hours, depending on the formulation
Legal status
Schedule 2 controlled drugs
NICE position
First-line for children and for adults
Who can start it
A Consultant Psychiatrist or other ADHD specialist, not a GP
What stimulant medication is
Stimulants are the group of ADHD medicines that increase the availability of dopamine and noradrenaline in the parts of the brain that handle attention, motivation and impulse control. Three are licensed for ADHD in the UK: methylphenidate, lisdexamfetamine and dexamfetamine.
The name is unhelpful. These medicines are not stimulants in the sense of caffeine or energy drinks, and a well-judged dose does not feel like being wired. Most people describe the effect as things becoming less effortful rather than as being sped up. Our guide to ADHD medication in the UK sets out how they sit alongside the non-stimulant options.
They act quickly, usually within about an hour, which has a practical consequence: the effect of a dose change is clear within a day or two, so titration can move at a reasonable pace compared with the non-stimulants.
The stimulant options
Three active ingredients, sold under more than a dozen UK brand names.
A prodrug: inactive until the body converts it, which gives a gentle build and taper.
The most prescribed ADHD medicine in the UK, and the parent of six brands.
Immediate-release amfetamine. What lisdexamfetamine converts into in the body.
Why formulation matters as much as the molecule
Two people prescribed methylphenidate can have completely different days, because an immediate-release tablet and a modified-release capsule release the same drug on very different curves. Immediate-release options give cover over part of a day. Modified-release options spread the dose across eight to twelve hours.
Licensing differs between the two as well, and it catches adults out. The short-acting immediate-release stimulants are not licensed for adults in the UK. Immediate-release methylphenidate tablets are licensed from age six, and dexamfetamine (Amfexa) for ages six to seventeen. Prescribing any of them to an adult is off-label, which a specialist can do where it is clinically justified. The modified-release products, including Concerta XL, Medikinet XL and Elvanse, do hold adult licences, which is why adult treatment starts with one of them.
Worth knowing
The MHRA advises prescribing modified-release methylphenidate by brand rather than generically. Concerta XL, Medikinet XL and Equasym XL are not interchangeable, and an unintended brand switch can change how a day feels.
Who stimulants are prescribed for
NICE guideline NG87 sets the UK position. For adults, either lisdexamfetamine or methylphenidate is offered as a first-line medication. For children and young people aged five and over, methylphenidate is the usual first choice, with lisdexamfetamine considered where a six-week trial of methylphenidate at an adequate dose has not helped enough.
Clinical context
Checks before starting
Before any stimulant is started, a specialist will check height, weight, pulse and blood pressure, and ask about heart conditions in you and your family. These baseline checks are repeated during treatment, and in children height and weight are tracked at every review because stimulants can slow growth.
Stimulants are generally avoided where there is significant cardiovascular disease, uncontrolled high blood pressure, hyperthyroidism, glaucoma, or a history of certain psychiatric conditions, and they are not combined with monoamine oxidase inhibitors.
Where a stimulant is unsuitable, has not been tolerated, or has not helped enough, non-stimulant options are considered instead.
Combined treatment
A stimulant and a non-stimulant are sometimes prescribed together. It is not a routine starting point, but it is a recognised option where a single medicine has given a partial response: a stimulant covering the working day with guanfacine or atomoxetine added for evening and overnight cover, for instance, or added where tics, sleep or emotional regulation are a prominent part of the picture. Combining medicines means more monitoring, particularly of pulse and blood pressure, and it is a specialist decision made and reviewed by a Consultant Psychiatrist rather than something to arrange independently.
What being a controlled drug means
All three stimulants licensed for ADHD in the UK are Schedule 2 controlled drugs. That is a legal classification about how the medicine is handled, not a judgement about the people taking it, but it does have day-to-day effects.
- Prescriptions are usually written for up to 30 days' supply at a time
- They are treated differently from ordinary medicines rather than issued as repeat prescriptions, so each one is written afresh
- Identification may be requested when collecting from a pharmacy
- Prescriptions expire sooner than ordinary ones, so collect them promptly
- Travelling abroad with them may need extra documentation
At The ADHD Centre we issue 30 tablets at a time, which for a once-daily medicine is a month's supply. The practical effect is a prescription roughly every month rather than the three or six months an ordinary repeat would cover.
None of this is a reason to avoid treatment, but it is worth planning around. People who travel often, work shift patterns, or move between addresses sometimes find the monthly prescribing cycle the most demanding part of treatment, and it is a fair thing to raise at review. A prescriber can often adjust timing so collections fall somewhere convenient.
Supply is also more tightly managed than for ordinary medicines, which is why shortages have been a recurring issue in recent years. Atomoxetine and guanfacine are not controlled drugs, so prescribing them is administratively simpler.
Side effects
Most side effects appear early, are mild, and settle within the first few weeks as the body adjusts. Our general guide to ADHD medication side effects covers all the licensed options in detail.
Common
- Reduced appetite, and sometimes weight loss
- Difficulty getting to sleep
- Dry mouth
- Headache
- Feeling anxious, restless or irritable
- A modest rise in heart rate or blood pressure
Less common
- Low mood, or mood becoming more changeable
- Tics, or existing tics becoming more noticeable
- Slowed growth in children
- Palpitations
Timing solves more of these than people expect. Difficulty sleeping is very often a dose taken too late rather than the wrong medicine, and appetite loss is frequently managed by moving meals rather than changing treatment.
When to seek advice promptly
Chest pain, breathlessness, fainting, a fast or irregular heartbeat, signs of poor circulation in the fingers or toes, or any new or worsening thoughts of self-harm. Seek advice urgently if reality starts to feel distorted, for example hearing or seeing things that are not there, believing things other people do not, or becoming unusually suspicious; or if mood becomes unusually elevated, racing or overactive with little need for sleep. These are uncommon but should be reviewed rather than waited out. Do not stop the medication abruptly without advice.
- Appetite and weight Why it happens and how it is managed
- Alcohol Risks and practical guidance
- Anxiety Whether medication helps or makes it worse
How long each option lasts
The practical difference between the stimulants is mostly timing.
Scroll the table sideways to see every column.
Duration is not a measure of how well a medicine works. A long-acting option is not automatically better: someone who only needs cover for a school day, or who is very sensitive to a stimulant late in the day, may do better on a shorter one. The right answer depends on the shape of your day.
Duration also varies between individuals. A dose that covers one person until early evening may fade by mid-afternoon for someone else. Keeping a simple record of when the effect starts and ends during titration gives your prescriber something concrete to work with rather than an impression.
What to expect in the first few weeks
Treatment does not start at the right dose. It starts low and increases in steps, with a review at each stage, until the benefit and the side effects are in an acceptable balance. That process usually takes several weeks, and it is normal to feel that the first dose is doing very little.
People often expect something dramatic and are surprised by how ordinary a good response feels. It usually shows up as things becoming less effortful: starting a task without a long build-up, reading a page once rather than four times, leaving a meeting with a record of what was said. Many describe it as background noise dropping rather than anything being added.
It is worth being equally clear about the limits. Medication does not teach planning, and it will not build a system for remembering appointments. Those are learned skills, which is why NICE positions medication inside a wider plan rather than as the whole of treatment. Where people are disappointed, it is often because the medication was expected to carry all of it.
The first medicine tried is not always the one someone stays on. Switching between stimulants, or between formulations of the same stimulant, is a normal part of treatment rather than a sign that something has gone wrong.
Getting a stimulant prescribed
A GP cannot start ADHD medication. Treatment has to be initiated by a specialist, such as a Consultant Psychiatrist, following a full assessment. Once the dose is stable, prescribing can sometimes transfer to a GP under a shared care agreement, although a practice can decline.
- How to get ADHD medication in the UK The full pathway, NHS and private
- How titration works Finding the right dose, and how long it takes
- What ADHD medication costs NHS prescription charges and private prices
Common questions
Are stimulants the first choice for ADHD?
For most people, yes. NICE offers methylphenidate first for children and young people, and either methylphenidate or lisdexamfetamine first for adults. Non-stimulants are considered where stimulants are unsuitable, not tolerated, or have not helped enough.
Do stimulants work straight away?
The medicine takes effect within about an hour, but finding the right dose is a separate process that usually takes several weeks of titration.
Are ADHD stimulants addictive?
Taken as prescribed and monitored by a specialist, they are not considered addictive, and treating ADHD is associated with a lower risk of substance misuse rather than a higher one. They are controlled medicines, so prescribing is carefully regulated.
What if a stimulant does not suit me?
Switching between stimulants, or between formulations of the same one, is a normal part of treatment. If stimulants as a group are unsuitable, atomoxetine or guanfacine may be considered instead.
Are short-acting stimulants licensed for adults?
No. Short-acting immediate-release stimulants are licensed in the UK for children and adolescents, so adult use is off-label and a specialist decision. The modified-release products, such as Elvanse, Concerta XL and Medikinet XL, are licensed for adults.
Can a stimulant and a non-stimulant be taken together?
Yes, where a single medicine has given only a partial response. Combined treatment is a recognised specialist option rather than a routine starting point, and it means closer monitoring of pulse and blood pressure.
Can I drink alcohol on a stimulant?
The product information for the licensed stimulants advises against it. The Ritalin, Concerta XL and dexamfetamine leaflets tell patients to abstain from alcohol during treatment, and the Elvanse information notes there are limited data on the interaction. Our alcohol guide sets out why, and what to discuss with your prescriber.
Can I take a break from stimulant medication?
Planned breaks are sometimes discussed, particularly for children over school holidays, and are a decision to make with your prescriber rather than alone. Do not stop abruptly without advice.
Will I have to stay on medication for life?
Not necessarily. Doses are reviewed, adjusted and sometimes stopped, and needs change over time as circumstances and demands change. Medication is one part of a treatment plan rather than a permanent commitment made at the start.
Important
This information is general and educational. It is not a substitute for medical advice. Decisions about starting, changing or stopping ADHD medication are always made together with a Consultant Psychiatrist following a full assessment.
Considering an ADHD assessment?
Any conversation about medication starts with a diagnosis. Our GMC-registered Consultant Psychiatrists assess adults and children. Assessments are £695 online and £1,095 in person in London or Manchester.
No GP referral needed. Appointments are usually available within weeks.
References
- Attention deficit hyperactivity disorder: diagnosis and management (NG87) National Institute for Health and Care Excellence
- Attention deficit hyperactivity disorder treatment summary British National Formulary
- Controlled drugs: list of drugs and their classification GOV.UK
- Yellow Card scheme Medicines and Healthcare products Regulatory Agency
Last reviewed September 2026. Next review due September 2027.
