ADHD Medicines: What They Can Help With and What to Expect

A practical Australian guide to stimulant and non-stimulant ADHD medicines, side effects, monitoring and finding the right dose

Starting ADHD medication can bring mixed feelings.

Some people are relieved to finally have a treatment option.

Others worry about:

• side effects;
• dependence;
• personality changes;
• sleep;
• appetite;
• blood pressure;
• whether they will need medication forever.

Those are reasonable questions.

ADHD medication can be very helpful for the right person, but the goal is not simply to make someone more productive or quieter.

The aim is to reduce ADHD symptoms enough that everyday functioning becomes easier, while keeping side effects acceptable.

Australian guidance recommends stimulant medicines as the usual first-line medication option for most older children, adolescents and adults whose ADHD is causing significant impairment. Non-stimulant medicines are important alternatives when stimulants are unsuitable, ineffective or poorly tolerated.

The practical question is:

“Is this medicine helping me function better — without creating problems that outweigh the benefit?”

What can ADHD medication actually help with?

Medication can reduce the core symptoms of ADHD.

Depending on the person, useful changes may include:

• being less easily distracted;
• starting tasks more easily;
• staying with tasks for longer;
• reducing impulsive decisions;
• remembering instructions more reliably;
• being less physically restless;
• organising work or study more effectively;
• following conversations more easily.

In children, parents and teachers may notice better task completion, classroom engagement and impulse control.

Medication can significantly reduce ADHD symptoms, but it does not automatically solve every difficulty associated with ADHD.

It is usually one part of a broader treatment plan.

What should successful treatment feel like?

Ideally, not dramatic.

A good response may sound like:

• “I still have to do the work, but starting is easier.”
• “I can stay with a boring task for longer.”
• “There is a little more space between an impulse and acting on it.”
• “I can listen through the whole conversation.”
• “My day feels less chaotic.”

Medication should not remove your personality, creativity or interests.

If you feel:

• emotionally flattened;
• excessively anxious;
• unusually irritable;
• unlike yourself,

the treatment should be reviewed.

The goal is better functioning with an acceptable quality of life.

What are stimulant medicines?

The main stimulant medicines used for ADHD in Australia are:

• methylphenidate;
• dexamfetamine;
• lisdexamfetamine.

They affect brain signalling systems involved in attention, motivation and impulse regulation.

Some stimulants are short acting and may last around 4 hours.

Longer-acting preparations may provide roughly 8–12 hours of coverage, although this varies between people and products.

The right formulation depends on:

• how long symptom control is needed;
• work or school hours;
• sleep;
• appetite;
• convenience;
• individual response.

Lisdexamfetamine is one long-acting option and is converted in the body to active dexamfetamine.

Longer acting is not automatically better.

What if the first stimulant does not work?

That does not automatically mean stimulant treatment will not help.

People can respond differently to:

• methylphenidate;
• amphetamine-based medicines;
• short- versus long-acting preparations.

If one stimulant does not provide enough benefit or causes troublesome side effects, another may be considered.

Finding the right medication often involves some trial and adjustment.

What are non-stimulant ADHD medicines?

Non-stimulant options used in Australian ADHD care include atomoxetine and, particularly in children and adolescents, guanfacine.

Clonidine is another non-stimulant medicine sometimes used.

These may be considered when:

stimulants do not work well enough;

stimulant side effects are unacceptable;

stimulants are unsuitable;

another clinical reason favours a non-stimulant.

They usually take longer to produce their full effect than stimulants.

Atomoxetine
Possible side effects include:

• nausea;
• reduced appetite;
• tiredness;
• sleep disturbance;
• changes in heart rate or blood pressure.

Mood or behavioural changes should also be discussed promptly with the prescriber.

Guanfacine
Possible effects include:

• sleepiness;
• fatigue;
• dizziness;
• lower blood pressure;
• slower heart rate.

Guanfacine should not usually be stopped suddenly without medical advice because blood pressure can rise after abrupt withdrawal.

Non-stimulants are not simply “weaker stimulants”.

For the right person, they may provide the better overall treatment.

How do we find the right dose?

ADHD medication is usually titrated.

That means starting relatively low and adjusting gradually.

The optimal dose is one where:

• symptoms are reduced;
• functioning improves;
• side effects remain acceptable.

The highest dose is not automatically the best dose.

Neither is the lowest.

The aim is to find the dose that gives the best balance of useful benefit and tolerable side effects.

What should I monitor when starting medication?

Before treatment, it helps to identify what you are actually trying to improve.

Examples might include:

• completing work without constant distraction;
• remembering appointments;
• reducing impulsive spending;
• finishing school tasks;
• managing household routines;
• improving attention while driving;
• interrupting people less.

Then monitor both benefits and side effects.

Useful things to watch include:

• concentration;
• organisation;
• task completion;
• impulsivity;
• appetite;
• weight;
• sleep;
• anxiety;
• mood;
• heart rate and blood pressure.

What are the common stimulant side effects?

Common issues include:

• reduced appetite;
• difficulty sleeping;
• headache;
• stomach upset;
• jitteriness;
• increased heart rate;
• increased blood pressure;
• irritability.

Not everyone experiences these.

Some effects improve with time or after adjusting:

• dose;
• timing;
• formulation.

Significant side effects should be discussed rather than simply tolerated.

Appetite, weight and children’s growth

Reduced appetite is common, particularly while stimulant medication is active.

Practical strategies may include:

• eating breakfast before the medicine takes full effect;
• taking medication with or after food when appropriate;
• eating nutritious food later in the day when appetite returns;
• reviewing the dose or timing if weight loss becomes significant.

In children and adolescents, height and weight should be measured regularly.

This does not mean every child taking stimulants will have a significant growth problem.

It means growth should be measured rather than guessed.

Sleep, anxiety and mood

Stimulants can interfere with sleep, particularly if the dose is too late or lasts longer than expected.

But ADHD itself can also make sleep difficult.

The same applies to anxiety. Some people feel more jittery on stimulants, while others become less anxious because they are more organised and less overwhelmed.

Timing also matters with irritability.

Feeling irritable all day may mean something different from a short period of irritability as medication wears off.

That “wearing-off” period is sometimes called a rebound effect.

Changes in dose, timing or formulation can sometimes smooth this out.

What about tics?

Some people with ADHD also have tic disorders.

Tics should be monitored when medication starts or changes.

A change in tics does not automatically mean stimulant medication cannot be used, but it should be discussed with the treating clinician.

Can stimulant medication cause psychosis or mania?

Very rarely, stimulant medication can be associated with psychotic or manic symptoms.

Warning symptoms may include:

• hallucinations;
• marked paranoia;
• severely abnormal behaviour;
• manic symptoms.

If these occur, stop the stimulant and contact the prescriber urgently.

This is uncommon, but important to know about.

What should be checked before stimulant medication starts?

The prescriber should review your medical and psychiatric history.

Particular attention is needed if there is:

• congenital heart disease;
• previous cardiac surgery;
• unexplained fainting with exercise;
• chest pain or palpitations;
• high blood pressure;
• a heart murmur;
• a family history of sudden cardiac death at a young age.

A family history of sudden death in a relative younger than 40 years is particularly important to mention.

Mental health, substance use and other medications also matter.

Do I need an ECG?

Not everyone needs an ECG simply because stimulant medication is being considered.

Further cardiac assessment depends on:

• symptoms;
• examination;
• cardiovascular history;
• family history;
• other risk factors.

The approach should be targeted rather than automatically ordering the same test for everyone.

What gets monitored once treatment is stable?

Monitoring should continue after the right dose has been found.

Heart rate and blood pressure should be checked after medication or dose changes and then periodically.

Once stable, six-monthly pulse and blood-pressure checks are commonly recommended.

Children and adolescents also need ongoing growth monitoring.

Medication should also be reviewed periodically to ask:

• Is it still helping?
• Is the dose still appropriate?
• Are side effects acceptable?
• Does the person still want to take it?

An annual medication review is reasonable once treatment is established.

Do stimulants cause addiction?

This deserves a careful answer.

Methylphenidate, dexamfetamine and lisdexamfetamine are controlled medicines because they have potential for:

• misuse;
• diversion;
• non-medical use.

Appropriately prescribed ADHD treatment is not the same as addiction, but these medicines do have misuse and diversion potential, which is why they are controlled and monitored.

Taking medication as prescribed is very different from recreational stimulant use or taking doses in ways that were not prescribed.

Never share ADHD medication

Do not:

• give tablets to a friend;
• let a sibling “try one”;
• sell medication;
• use someone else’s prescription.

In NSW, methylphenidate, dexamfetamine and lisdexamfetamine are Schedule 8 controlled medicines.

Store them securely, especially in shared households or where children can access them.

What if someone takes more than prescribed?

Do not casually increase a Schedule 8 stimulant dose.

More medication does not necessarily produce better concentration.

Too much can increase:

• anxiety;
• insomnia;
• irritability;
• heart rate;
• blood pressure;
• other adverse effects.

The goal is useful function, not an increasingly noticeable stimulant effect.

Should medication be taken every day?

It depends.

Some people take ADHD medication daily.

Others may have a different plan depending on:

• age;
• medicine;
• functional needs;
• side effects.

Planned breaks may occasionally be considered, particularly when appetite or growth is a concern in children.

Routine “drug holidays” are not automatically necessary and should be discussed with the prescriber rather than improvised.

Will medication change my personality?

It should not.

A child should not become unusually:

• flat;
• withdrawn;
• joyless;
• excessively quiet

simply to make classroom behaviour easier.

An adult should not feel treatment has removed:

• humour;
• creativity;
• spontaneity;
• emotional connection.

If medication makes someone feel less like themselves in a negative way, the treatment should be reviewed.

Does medication replace strategies or therapy?

No.

Medication may make it easier to use strategies.

A person may still benefit from:

• routines;
• reminders;
• organisational systems;
• ADHD-focused psychological strategies;
• coaching;
• parent or family support;
• school or workplace adjustments;
• treatment of anxiety, depression or sleep disorders.

Medication and non-medication approaches often work best together.

Alcohol and recreational drugs

Tell your prescriber honestly about:

• alcohol;
• cannabis;
• cocaine;
• methamphetamine;
• other recreational substances.

This is not about punishment.

Substance use can affect:

• medication choice;
• safety;
• diagnosis;
• risk of misuse or diversion.

ADHD medication and driving

Untreated ADHD can affect attention and impulsivity while driving.

Effective medication may improve driving function for some people.

However, do not drive if medication makes you feel:

• dizzy;
• significantly unwell;
• excessively stimulated;
• sedated;
• otherwise unsafe.

Can I stop ADHD medication?

ADHD medication does not automatically mean lifelong treatment.

Some people continue because it remains clearly useful.

Others later reconsider:

• whether they still benefit;
• whether their circumstances have changed;
• whether side effects outweigh benefits.

Stopping or changing treatment should be discussed with the prescriber.

What if medication does not help?

First ask whether the trial was adequate.

Important questions include:

• Was the dose appropriate?
• Was it taken consistently?
• Did it last during the period when symptoms mattered?
• Were side effects limiting the dose?
• Were the treatment goals realistic?

If appropriate stimulant trials do not help, options may include:

• another stimulant class;
• a non-stimulant;
• reviewing co-occurring conditions;
• reconsidering the diagnosis;
• strengthening non-medication strategies.

Medication failure should trigger reassessment, not endless dose escalation.

What about children under 5?

Medication decisions are different in very young children.

There is not enough evidence to recommend routine ADHD medication treatment for children under 5.

These children should generally be managed with involvement from a clinician experienced in child development and ADHD.

How does prescribing work in NSW?

Psychostimulant prescribing is regulated.

The Schedule 8 stimulants used for ADHD in NSW include:

• dexamfetamine;
• lisdexamfetamine;
• methylphenidate.

Since 1 September 2025, appropriately trained NSW GPs can become authorised continuation prescribers for eligible people aged 6 years and older who already have an established diagnosis and treatment.

A second reform is underway.

Around 330 endorsed GP prescribers began training in March 2026.

As they complete the pathway from around September–October 2026, they will be able to diagnose ADHD and commence psychostimulant treatment where appropriate.

This does not mean every GP can diagnose and prescribe ADHD medication in every situation.

The individual doctor’s training and authorisation still matter.

A common misconception

MYTH: If stimulant medication works, that proves I have ADHD.

REALITY: No.

People without ADHD can also experience stimulant effects.

Medication response is not a diagnostic test.

ADHD should be diagnosed through a proper clinical assessment, as explained in Q Guide Could It Be ADHD? What an Assessment Actually Involves.

Another common misconception

MYTH: The correct dose should make me feel intensely focused all day.

REALITY: The goal is not an artificial state of intense focus.

The aim is better control over attention and behaviour so everyday functioning becomes easier.

If medication makes you feel excessively stimulated, emotionally different or unable to sleep, it may need adjustment.

What should I ask at a medication review?

Useful questions include:

• What are we trying to improve?
• Is the medicine actually doing that?
• How long should each dose last?
• What side effects should I watch for?
• Is my blood pressure and pulse being monitored?
• Is appetite or weight becoming a problem?
• Is sleep worse?
• Would another formulation fit my day better?
• Do I still need this dose?

A good medication review is about more than renewing the prescription.

The question I would ask

After medication has had an adequate trial, I would ask:

“What is genuinely easier in your life now that you are taking it?”

If the answer is:

“Nothing really — I can just feel that I have taken something,”

that is not a convincing treatment benefit.

The aim is functional improvement.

The bottom line

ADHD medicines can make a meaningful difference.

For most older children, adolescents and adults with significantly impairing ADHD, stimulant medicines such as:

• methylphenidate;
• dexamfetamine;
• lisdexamfetamine

are usual first-line medication options.

Non-stimulants such as atomoxetine, and guanfacine particularly in children and adolescents, provide important alternatives when stimulants are ineffective, poorly tolerated or unsuitable.

Finding the right treatment usually means:

start carefully → define what improvement should look like → adjust the dose → monitor function and side effects → review regularly.

The best medication is not the one you can feel most strongly.

It is the one that helps you function better while still allowing you to feel like yourself.

Related Q Guides

• Could It Be ADHD? What an Assessment Actually Involves
• Snoring, Tired and Foggy? Could It Be Sleep Apnoea?