Zopiclone: uses, dosage, side effects and how to take it safely

Zopiclone is one of the most prescribed short-term treatments for insomnia — a 'Z-drug' that helps you fall asleep faster and wake less during the night. This guide covers what it's for, the right dose, how quickly it works, the side effects to expect, and the important rules that keep it safe.

What zopiclone is used for

Zopiclone treats short-term insomnia — trouble falling asleep, waking during the night, or waking too early — when it's severe enough to affect daily life. It belongs to the 'Z-drugs', which act on the same GABA receptors as benzodiazepines to calm brain activity, but are chemically different. It's intended as a short-term aid while you address the underlying cause of poor sleep, not a permanent solution. Products we stock include Zopisign 7.5mg and 10mg.

Dosage — how much to take

The usual adult dose is one 7.5mg tablet just before bedtime. Older adults, and people with liver or kidney problems, are usually started on 3.75mg (half a tablet) because the medicine clears more slowly. Take it only when you can get a full night's sleep (7–8 hours) — taking it when you have to wake early is a common cause of next-day grogginess. Never take more than the prescribed dose to 'boost' the effect.

How long it takes to work and how long to use it

Zopiclone works in about an hour, so take it right before you get into bed rather than earlier. It's licensed for short-term use only — typically 7 to 14 days, and no more than 4 weeks, because tolerance and dependence build with longer use. Using it for a couple of weeks to break a bad sleep cycle is the intended pattern; relying on it for months is not.

Side effects

The most distinctive side effect is a bitter or metallic taste in the mouth. Others include daytime drowsiness, dizziness, dry mouth, headache and, less often, next-day impairment that can affect driving. Because it can cause drowsiness the following morning, don't drive or operate machinery until you know how it affects you. Serious effects (memory problems, unusual behaviour during sleep) are uncommon but a reason to stop and see a doctor.

Safety and dependence

The main risk with zopiclone is dependence — the reason it's short-term only. Don't combine it with alcohol or other sedatives (a dangerous additive effect on breathing), and don't stop suddenly after prolonged use, as rebound insomnia can follow — a doctor can taper you off. It's not suitable in pregnancy, severe breathing problems, or a history of substance dependence without medical advice. See the insomnia treatment guide.

Key points to remember

• What zopiclone is used for: Zopiclone treats short-term insomnia — trouble falling asleep, waking during the night, or waking too early — when it's severe enough to affect daily life. It belongs to the 'Z-drugs', which act on the same GABA receptors as benzodiazepines to calm brain activity, but are chemically different.
• Dosage — how much to take: The usual adult dose is one 7.5mg tablet just before bedtime. Older adults, and people with liver or kidney problems, are usually started on 3.75mg (half a tablet) because the medicine clears more slowly.
• How long it takes to work and how long to use it: Zopiclone works in about an hour, so take it right before you get into bed rather than earlier. It's licensed for short-term use only — typically 7 to 14 days, and no more than 4 weeks, because tolerance and dependence build with longer use.
• Side effects: The most distinctive side effect is a bitter or metallic taste in the mouth. Others include daytime drowsiness, dizziness, dry mouth, headache and, less often, next-day impairment that can affect driving.
• Safety and dependence: The main risk with zopiclone is dependence — the reason it's short-term only. Don't combine it with alcohol or other sedatives (a dangerous additive effect on breathing), and don't stop suddenly after prolonged use, as rebound insomnia can follow — a doctor can taper you off.

Common questions

How long does zopiclone take to work?

About an hour, so take it just before bed. Take it only when you can get a full 7–8 hours' sleep to avoid next-day grogginess.

What is the usual dose of zopiclone?

One 7.5mg tablet at bedtime for adults; 3.75mg (half) for older adults or those with liver/kidney problems. Never exceed the prescribed dose.

Is zopiclone addictive?

It can cause dependence, which is why it's licensed for short-term use only (usually 7–14 days, no more than 4 weeks). Don't stop suddenly after prolonged use — a doctor can taper you off.

Can I drink alcohol with zopiclone?

No — combining zopiclone with alcohol or other sedatives dangerously increases drowsiness and can affect breathing. Avoid alcohol while taking it.

References & further reading

• NHS: Sildenafil (Viagra) — uses, dosage, side effects — official UK guidance on the active ingredient.
• Goldstein I, et al. NEJM 1998 — the pivotal sildenafil trial — lead-authored by Dr. Irwin Goldstein (San Diego Sexual Medicine).
• Phosphodiesterase 5 Inhibitors — StatPearls, NCBI Bookshelf — clinical pharmacology reference.

This article is general information, not medical advice. Always consult a healthcare professional before starting any medication.