Atomoxetine (Strattera)
What is atomoxetine?
Atomoxetine is known as Strattera in the United States, the UK, and Japan alike (ストラテラ on Japanese packaging). (One practical note: supply in Japan has been patchy recently after a manufacturing issue affecting both the brand and generics; your doctor will know the current situation.) It's a non-stimulant medicine for ADHD: it works steadily through the day by raising noradrenaline, a brain messenger involved in attention and self-control.
How is it different from stimulant ADHD medicines?
- Not a controlled substance: no registration system, no import permits; any doctor can prescribe it, and it travels across borders under ordinary medicine rules
- Smooth, around-the-clock coverage: no on-off cycle through the day
- No abuse or dependence potential
- Fully startable for adults in Japan, without the registry that stimulant treatment requires
What is it used for in Japan?
ADHD (attention-deficit / hyperactivity disorder), in both children and adults.
How does it help?
By steadily raising noradrenaline, it supports focus, impulse control, and settling restlessness. Unlike stimulants, it builds up gradually: the benefit comes over a few weeks rather than on day one, so keep taking it as prescribed even if you don't notice a change at first.
Atomoxetine, guanfacine, or Concerta: which is right for me?
There's no universal winner; the three trade different strengths, and the choice is individual.
| Concerta (stimulant) | Atomoxetine (non-stimulant) | Guanfacine (non-stimulant) | |
|---|---|---|---|
| Speed | Works from day one | Builds over a few weeks | Builds over one to a few weeks |
| Effect | Often somewhat stronger on average | Solid and steady, focus-led | Solid, especially on impulsivity and restlessness |
| Coverage | About 12 hours; can fade in the evening | Around the clock | Around the clock |
| Rules | Controlled medicine: registered doctors only, import permits | Ordinary medicine: any doctor, normal import rules | Ordinary medicine: any doctor, normal import rules |
| Habit-forming potential | Regulated as a stimulant | None | None |
| Getting it right now | Supply has been restricted since late 2025, and starting it new can be difficult | Supply was also disrupted, but prescribing continues | Normally available |
Among the non-stimulants, atomoxetine leans toward the attention-and-focus side, while guanfacine is often preferred when tics, sleep problems, or strong emotional reactivity travel with the ADHD. Non-stimulants also fit when substance use is part of the history or the stimulant framework is a poor fit. Plenty of people do well on any of the three, switching is routine, and it's a decision you make with your doctor, not a one-way door.
What should I tell my doctor before starting?
A few situations rule it out entirely; your doctor will choose something else if any of these apply:
- A past allergic reaction to atomoxetine
- Taking, or recently stopping, an MAO inhibitor; these can't overlap
- A serious heart or blood-vessel condition
- A phaeochromocytoma or paraganglioma (rare adrenal-area tumours), now or in the past
- Narrow-angle glaucoma
And tell your doctor first if any of these apply; these usually just need adjustments or a closer eye:
- High blood pressure, a fast heartbeat, or other heart concerns
- Liver problems
- Difficulty passing urine (for example, with prostate enlargement)
- A history of seizures
- Pregnant, planning to be, or breastfeeding (see the section below)
Your blood pressure and pulse are checked before starting and during treatment, as atomoxetine can nudge them up a little.
How do I take it, and what if I miss a dose?
Atomoxetine is taken once or twice a day as your doctor directs, starting low and building up over weeks.
- If you miss a dose: take it when you remember that day, or just skip it if it's near the next one. Never take a double dose to catch up
- Nausea is most likely in the early weeks; taking it after food helps, and it usually fades
- Give it its build-up time before judging it; the fair test is at several weeks, not several days
What side effects should I expect?
Most are mild and often settle, and many can be eased with a counter-medicine (nausea, for example). Not everyone gets them.
- Nausea (around 30%): the most common one, and mostly an early-weeks experience; taking it after food helps a lot, and it usually fades as your body adjusts
- Reduced appetite (around 20%): mostly an early-treatment effect; keeping regular mealtimes helps, and it usually settles
- Drowsiness (around 15%)
- Headache (around 15%)
- Dry mouth
- Some weight loss
- A faster heartbeat, or a small rise in blood pressure
If anything is bothering you, tell your doctor; there's often a way to adjust.
Finally, two things that are rare (most people never experience them) but good to know:
- Yellowing of the skin or eyes, dark urine, or unusual tiredness: very rare, but worth a prompt check, as these can point to the liver
- Especially in younger people early in treatment: if mood dips or distressing thoughts appear, tell your doctor straight away so the plan can be adjusted
Will I become dependent? How do I stop safely?
No; atomoxetine isn't a stimulant and isn't habit-forming. There's no craving, and stopping doesn't cause a withdrawal syndrome, so it can usually be stopped without a long taper. Even so, time any change with your doctor rather than deciding alone, so the gains don't quietly unravel.
Can I drive while taking it?
The Japanese label advises against driving while taking it. Drowsiness and dizziness can occur, and the prescribing information here instructs that patients on atomoxetine shouldn't drive or operate dangerous machinery. In practice, discuss your own situation with your doctor, especially in the first weeks and after dose changes.
What about pregnancy and breastfeeding?
Tell your doctor early; this is decided case by case. There's less accumulated data than with older medicines, so the plan is individual: weighing how much the treatment is doing for you against the unknowns. Don't stop or continue on your own. Our guides to medication in pregnancy and medication while breastfeeding cover the wider picture.