ADHD medication is the most evidence-based treatment for adult ADHD, and for many people it's the intervention that makes the biggest difference. But the UK prescribing landscape is complex: shared care agreements, medication shortages, NHS vs private costs, and the titration process all create confusion. Here's what you actually need to know.
What NICE Recommends
NICE guideline NG87 recommends medication as a first-line treatment for adults with ADHD (alongside non-pharmacological support). The recommended first-line options are lisdexamfetamine or methylphenidate. If one doesn't work after a six-week trial at adequate doses, clinicians should try the other. If neither stimulant is effective or tolerated, atomoxetine (a non-stimulant) is the third-line option.
The Medications
Stimulants
Methylphenidate is available in several formulations. Immediate-release versions (Ritalin, Medikinet) last 3-4 hours and are taken two or three times daily. Long-acting versions (Concerta XL, Medikinet XL, Equasym XL) last 8-12 hours with a single morning dose. Most adults end up on long-acting formulations for convenience and consistency.
Lisdexamfetamine (Elvanse) is a long-acting stimulant taken once daily. It's a prodrug, meaning it's converted to its active form (dexamfetamine) in the body, which gives it a smoother onset and offset than some methylphenidate formulations. Many adults find it effective when methylphenidate isn't quite right.
Dexamfetamine is available in short and long-acting forms. It's sometimes used when lisdexamfetamine works well but the dose needs fine-tuning.
Non-Stimulants
Atomoxetine (Strattera) works differently from stimulants, targeting norepinephrine rather than dopamine. It takes 4-6 weeks to reach full effect, which requires patience compared to stimulants that work within hours. It's typically prescribed when stimulants aren't suitable or haven't worked.
Guanfacine (Intuniv) is licensed for children and adolescents but used off-label in adults. It's generally reserved for cases where other options haven't worked, as the evidence base in adults is more limited.
How Prescribing Works
Only a specialist with ADHD expertise can initiate medication. This applies whether you're assessed through the NHS, via Right to Choose, or privately. Your GP cannot start ADHD medication independently.
The process starts with titration: a period of 8-12 weeks where your specialist adjusts the medication type and dose while monitoring for side effects. During titration, your specialist handles prescribing.
Once you're stable on a fixed dose, the specialist sends a shared care agreement to your GP. Under shared care, your GP takes over routine prescribing and monitoring (blood pressure, heart rate, weight) while the specialist remains available for advice. This means you get NHS prescriptions at £9.90 per item (or free in Scotland, Wales, and Northern Ireland) rather than private prescription costs.
Some GPs decline shared care agreements. They're not obligated to accept, though NICE guidance strongly supports shared care for ADHD. If your GP refuses, the specialist retains prescribing responsibility, which usually means continuing on private prescriptions at higher cost. Our guide on GP acceptance of private diagnoses covers strategies for handling this.
Side Effects
Stimulant side effects are generally manageable and often improve over the first few weeks. The most common are appetite suppression (particularly in the hours after taking the medication), sleep difficulties (especially with longer-acting formulations or doses taken too late), increased heart rate, and mood fluctuations as the medication wears off. These are typically dose-related, and adjusting the dose or timing often resolves them.
Atomoxetine side effects can include nausea, dizziness, fatigue, and mood changes. Liver function monitoring is recommended. Sexual side effects are more common with atomoxetine than stimulants. Most side effects improve as your body adjusts, but if they persist, your clinician can adjust the treatment plan.
Costs
On an NHS prescription (via shared care), you'll pay the standard charge of £9.90 per item in England. If you're prescribed monthly, a Prescription Prepayment Certificate saves money: £32.05 for three months or £114.50 for 12 months, covering unlimited prescriptions. Prescriptions are free in Scotland, Wales, and Northern Ireland.
Private prescriptions cost significantly more. Methylphenidate runs £15-50 per month depending on the formulation. Lisdexamfetamine is £50-130 per month. Private follow-up consultations add £150-250 each. This is why getting onto shared care with your GP is financially important: it reduces ongoing medication costs from potentially £100+ per month to £9.90.
The Shortage
Since September 2023, the UK has experienced intermittent shortages of ADHD medications. The causes are a combination of increased global demand (driven by rising diagnosis rates) and manufacturing supply chain issues. The NHS Specialist Pharmacy Service publishes regular updates on availability.
If your medication is out of stock, speak to your prescriber rather than your pharmacy. Your clinician can switch you to an equivalent formulation that's currently available, adjust the brand, or in some cases switch to a different medication within the same class. Pharmacies can also check stock at other branches. The shortage is frustrating, but there are usually workarounds.
Medication Isn't the Whole Picture
Medication addresses the neurological aspects of ADHD: it improves attention, reduces impulsivity, and makes executive function tasks less effortful. But it doesn't teach you the skills you may have missed, rebuild habits that weren't working, or resolve the emotional impact of years of undiagnosed ADHD. That's where CBT, coaching, and Access to Work support come in. The combination of medication and non-pharmacological support consistently produces better outcomes than either alone.
Sources
NICE NG87: ADHD diagnosis and management · NHS SPS: Prescribing available ADHD medicines · NHS SPS: ADHD medication shortage management · ADHD UK · ADHDadultUK: Shared care information · BJGP: Managing ADHD medication side effects
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