Zolpidem (Ambien / Myslee)

What is zolpidem?

Zolpidem is known as Ambien in the United States, Stilnoct in the UK and parts of Europe, and Myslee in Japan (マイスリー on Japanese packaging); it's all the same medicine. It belongs to the "Z-drug" (non-benzodiazepine) group of sleep medicines: it calms the brain's activity at night so you can fall asleep more easily, and it's meant as short-term help while sleep settles.

How is it different from other sleeping pills?

• Works from the first night: no build-up period, unlike many other psychiatric medicines
• Fast and targeted: designed for the falling-asleep problem specifically
• Short-acting by design, aiming to be largely out of your system by morning
• Decades of worldwide experience: one of the most used sleep medicines in the world

What is it used for in Japan?

Insomnia: mainly difficulty falling asleep. (The Japanese approval excludes insomnia that comes with schizophrenia or bipolar disorder, where different treatment is used.)

What it targets: the start of the night. It's short-acting, so it specialises in falling asleep rather than 3 a.m. waking.

How does it help?

It quietens the brain's activity at night so you can fall asleep more easily. It works fast, so it's taken right before bed, and it works best as a short bridge alongside good sleep habits.

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 zolpidem
• Serious liver problems
• Myasthenia gravis (a muscle-weakness condition)
• Acute narrow-angle glaucoma
• A previous episode of acting out in your sleep (sleepwalking and the like) on this medicine

And tell your doctor first if any of these apply; these usually just need adjustments or a closer eye:

• Other sedating medicines, or regular alcohol use
• Breathing problems during sleep (such as sleep apnea)
• Pregnant, planning to be, or breastfeeding (see the section below)

How do I take it?

Only right before bed, and only on nights you can give a full night to sleep.

• Take it immediately before lying down, not earlier in the evening
• Don't take it if you might need to get up and function during the night
• If you forget it, don't take it in the middle of the night; just skip that night. Never take a second dose in one night
• Go easy on alcohol; it adds to the effect and raises the risk of doing things you won't remember
• Older adults usually start at a lower dose

What side effects should I expect?

Most are mild. Not everyone gets them.

• Drowsiness, dizziness, or feeling unsteady: most common, so watch your footing, especially at night
• A "hangover" or leftover sleepiness the next morning
• Headache
• Nausea

If anything is bothering you, tell your doctor; there's often a way to adjust.

Finally, one thing that is rare (most people never experience it) but good to know:

• Very occasionally, people carry out activities while not fully awake (walking, eating, even driving) with no memory of it afterwards. If you or someone around you notices this, stop the medicine and tell us; switching to a different type of sleep aid solves it

Will I become dependent? How do I stop safely?

It can be habit-forming with regular long-term use, so it's used short term, at the lowest dose that works, and stopped with a plan. The body can come to rely on it, and stopping suddenly can bring a few nights of rebound poor sleep, so never stop suddenly on your own; your doctor lowers it gradually or shifts to as-needed use. The aim is a short bridge while sleep recovers, not an indefinite prescription, and your doctor will revisit whether it's still needed.

Can I bring it into Japan?

Yes, within limits, because it's a controlled medicine here. Zolpidem is a scheduled (psychotropic) medicine in Japan: a personal supply of roughly up to a month travels with you without advance permission (keep it in the original packaging with your prescription), larger amounts need an advance import certificate, and mailing it to Japan is prohibited. Japanese rules also don't allow it to be prescribed at a first online visit, so plan an in-person start. One more note: the extended-release form (Ambien CR) isn't sold in Japan; the standard tablets are.

Can I drive while taking it?

No. Don't drive after taking it, and be alert to leftover drowsiness the next morning. The Japanese label is stricter here than for many medicines: because the effect can carry into the next day, patients on zolpidem are instructed not to drive or operate dangerous machinery. If next-morning sleepiness keeps happening, tell your doctor; the dose or the medicine can be changed.

What about pregnancy and breastfeeding?

Tell your doctor early; this one is planned case by case. In pregnancy, sleep medicines are kept to the minimum and other approaches are often preferred first. With breastfeeding, zolpidem is avoided (it passes into milk and can make the baby drowsy). Don't start, stop, or continue on your own; our guides to medication in pregnancy and medication while breastfeeding cover the wider picture.