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ADHD medication includes stimulants such as methylphenidate and non-stimulants such as atomoxetine. This guide explains how each type works, their evidence base, common side effects and what to expect from medication treatment.
Medication is one of the most effective evidence-based treatments for ADHD. NICE guidelines recommend medication as a treatment option for ADHD alongside non-medication approaches. The two main categories of ADHD medication are stimulants and non-stimulants. Stimulants, including methylphenidate and amphetamine-based medications, are the most widely prescribed and have the strongest evidence base. Non-stimulants, including atomoxetine and guanfacine, are prescribed when stimulants are not suitable or not effective. Around 70 to 80 percent of people with ADHD respond positively to stimulant medication.
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Stimulant medications for ADHD work primarily by increasing the availability of dopamine and norepinephrine in the synaptic cleft, particularly in the prefrontal cortex and other circuits involved in attention regulation and executive function. By improving the signal strength of these neurotransmitters, stimulants help the ADHD brain regulate attention and impulse control more effectively. The paradoxical calming effect of stimulants in people with ADHD reflects the improved regulatory function of these circuits.
Methylphenidate (sold under brand names including Ritalin, Concerta and Equasym) is the most commonly prescribed ADHD medication in the UK for children and adults. It is available in immediate-release formulations taken two to three times daily and extended-release formulations taken once daily. NICE recommends methylphenidate as the first-line medication for most children and young people with ADHD. The starting dose is low and titrated upward to find the effective dose with minimal side effects.
Lisdexamfetamine (Vyvanse or Elvanse) is an amphetamine-based stimulant medication available in the UK for children aged 6 and over and for adults. It is a prodrug that is metabolised to d-amphetamine in the body, which produces a smooth and extended profile of effect. Lisdexamfetamine is recommended by NICE as an option for children who have had an inadequate response to methylphenidate. Dexamfetamine (Dexedrine) is another amphetamine-based option used in some circumstances.
Non-stimulant ADHD medications are used when stimulants are not suitable or not effective. Atomoxetine (Strattera) is a selective norepinephrine reuptake inhibitor that takes several weeks to reach its full effect. Guanfacine (Intuniv) is an alpha-2 agonist that reduces hyperactivity and impulsivity and is particularly used in children with tics alongside ADHD. Clonidine is another alpha-2 agonist used in some cases. Non-stimulants generally have a weaker evidence base than stimulants but are a valuable option for those who cannot use stimulants.
Common side effects of stimulant medications include reduced appetite particularly during the day, difficulty falling asleep if medication is taken too late, headaches, stomach aches and initial irritability or mood changes when the medication wears off. Most side effects reduce over time or with dose adjustment. Reduced appetite is one of the most commonly discussed concerns: monitoring growth in children is recommended. Some people experience rebound effects as the medication wears off in the late afternoon or evening.
A common concern about ADHD medication is that it is addictive or will lead to substance misuse. Research does not support this: properly prescribed ADHD medication is not associated with an increased risk of addiction and may actually reduce the risk of substance misuse by improving ADHD self-regulation. Stimulant medications are controlled substances in the UK, meaning they require a special prescription, but this reflects their classification rather than a high risk of addiction when used as prescribed.
For related information see our articles on ADHD Diagnosis Process and ADHD and Executive Function.
The main ADHD medications are stimulants, including methylphenidate (Ritalin, Concerta) and lisdexamfetamine (Elvanse), and non-stimulants, including atomoxetine (Strattera) and guanfacine (Intuniv). Stimulants are the first-line recommended treatment and are effective in around 70 to 80 percent of people with ADHD. Non-stimulants are an alternative when stimulants are not suitable or effective.
Stimulant medications typically take effect within 30 to 60 minutes and wear off over several hours depending on the formulation. Extended-release formulations provide 8 to 12 hours of coverage. Non-stimulant medications such as atomoxetine take several weeks to reach their full effect. Finding the right medication and dose typically involves a titration period of several weeks under specialist supervision.
Properly prescribed ADHD medication is not associated with an increased risk of addiction. Research suggests that treating ADHD effectively may actually reduce the risk of substance misuse by improving self-regulation. Stimulant medications are controlled substances requiring special prescriptions, but this reflects their classification rather than a high addiction risk when used as prescribed for ADHD.
Visit our Understanding ADHD hub for more guides on signs, diagnosis, types, medication, executive function and co-occurring conditions.
The information in this article is provided for educational purposes only and is not intended as medical advice. If you have concerns about ADHD or any neurodevelopmental condition, speak to a qualified healthcare professional. SENDhelp Education Limited accepts no responsibility or liability for any loss or damage arising from reliance on this content. Any links to third-party websites are provided for convenience only and do not constitute endorsement of their content.
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