Zopiclone Not Working

Medical information: This article provides general educational information. Zopiclone is a prescription-only medicine. Never take an additional dose, increase the strength, combine it with another sedative or stop regular treatment suddenly without professional advice.

If zopiclone is not working, do not take another tablet during the same night. The medicine normally begins working within approximately 30 to 60 minutes, but its effect can vary between people and nights.

Zopiclone may feel less effective because of tolerance, incorrect timing, another medicine, stress or an untreated cause of insomnia. It may also be unsuitable for the type of sleep problem you have.

If your prescribed dose is repeatedly not helping, speak with your GP, pharmacist or prescriber. The safe next step is a treatment review—not an unsupervised dose increase.

Key

• Do not take more than one prescribed dose in the same night.
• One bad night does not automatically mean that tolerance has developed.
• Repeated use can make zopiclone feel less effective.
• A need for a higher dose may be a warning sign of tolerance.
• Other medicines and supplements can alter zopiclone’s effect.
• Anxiety, pain, depression and sleep disorders may continue to disrupt sleep.
• Never move from 3.75mg to 7.5mg without prescriber approval.
• Do not suddenly stop regular use because withdrawal and rebound insomnia may occur.
• Long-term insomnia usually requires treatment beyond sleeping tablets.

Zopiclone Not Working: Quick Guide

How Long Should Zopiclone Take to Work?

The NHS zopiclone guidance says that zopiclone normally takes around 30 to 60 minutes to start working.

This does not mean that everyone will fall asleep at exactly the same time. Its effect can be influenced by:

• the severity of the insomnia;
• stress and anxiety;
• pain or physical symptoms;
• caffeine, nicotine and alcohol;
• other medicines;
• the prescribed strength;
• individual sensitivity; and
• the time available for uninterrupted sleep.

Zopiclone should be taken exactly as stated on the dispensing label. Current UK product information says it should be taken as a single dose just before retiring and should not be taken again during the same night.

For a more detailed timing explanation, read how long zopiclone takes to work.

What Does “Not Working” Actually Mean?

People can mean different things when they say that zopiclone is not working.

For example, you may:

• remain completely awake;
• take longer than expected to fall asleep;
• fall asleep but wake repeatedly;
• wake much earlier than planned;
• sleep without feeling refreshed;
• feel tired but mentally alert;
• experience benefit on some nights but not others; or
• notice that a previously effective dose has become weaker.

These experiences do not necessarily have the same cause.

A short sleep diary can help your prescriber understand the pattern. Record:

Do not experiment with the dose to complete this record.

1. Zopiclone May Not Have Had Enough Time to Work

Some people expect to become unconscious immediately after taking zopiclone. That is not how its effect should be measured.

The NHS describes an approximate onset of 30 to 60 minutes. Personal response may vary, and one night can be different from another.

Taking an additional tablet because sleep has not started quickly can cause an overdose or dangerous next-day impairment.

Safe rule: Take only the prescribed dose and never repeat it during the same night.

2. Tolerance May Have Developed

Tolerance means that the same amount of medicine produces less effect than it did previously.

The NHS explains that zopiclone is normally prescribed for only a few days or weeks and usually not for more than four weeks because the body can become used to it.

The MHRA’s January 2026 safety update identifies reduced effect during chronic use and feeling that a higher dose is needed as possible signs of tolerance.

Possible warning signs include:

• the medicine worked initially but now feels weaker;
• you feel tempted to take an additional tablet;
• you want a stronger dose;
• you are using it more frequently than planned;
• you are requesting treatment earlier than expected; or
• sleep without the medicine feels increasingly difficult.

Not every poor night proves that tolerance has developed. Current product information notes that some loss of hypnotic effect may occur after repeated use, while marked tolerance is not necessarily seen during every treatment period of up to four weeks.

A prescriber should review the complete pattern rather than judging it from one night.

3. The Underlying Cause of Insomnia May Still Be Present

Zopiclone can temporarily support sleep, but it does not remove every possible cause of insomnia.

Sleep can remain difficult because of:

• anxiety or persistent worry;
• depression or low mood;
• grief or major life changes;
• chronic pain;
• menopause symptoms;
• breathing difficulties;
• an irregular sleep routine;
• shift work;
• caffeine or nicotine;
• alcohol or recreational substances;
• another medicine; or
• an uncomfortable sleeping environment.

The UK product information states that the cause of insomnia should be identified wherever possible and underlying factors should be treated.

If the original problem has become worse, the same zopiclone prescription may no longer provide the expected result. Increasing sedation does not treat untreated pain, depression, anxiety or another medical condition.

4. You May Have a Different Sleep Disorder

Persistent poor sleep is not always ordinary insomnia.

A clinical review may need to check for:

• obstructive sleep apnoea;
• restless legs syndrome;
• circadian-rhythm disruption;
• delayed sleep timing;
• parasomnias;
• medication-related sleep disturbance; or
• another physical or mental-health condition.

Possible sleep-apnoea signs include loud snoring, choking or gasping during sleep, witnessed breathing pauses, morning headaches and severe daytime sleepiness.

Zopiclone is not appropriate for severe sleep apnoea. If these symptoms are present, request a proper sleep assessment instead of increasing the tablet strength.

5. Another Medicine May Be Changing Its Effect

Some prescription medicines, pharmacy products, herbal remedies and supplements interact with zopiclone.

Current product information says that certain substances may reduce zopiclone levels, including:

• rifampicin;
• carbamazepine;
• phenobarbital;
• phenytoin; and
• St John’s wort.

Other medicines can increase zopiclone levels or intensify sedation. These include certain antibiotics, antifungal medicines, opioids and other central nervous system depressants.

Do not stop or change any medicine yourself. Ask a pharmacist or prescriber to review:

• all prescription medicines;
• over-the-counter products;
• herbal remedies;
• vitamins and supplements;
• alcohol use; and
• recreational substances.

Take the medicine packets or an accurate list to the review.

6. The Selected Strength May Reflect Your Safety Needs

Zopiclone is commonly supplied in 3.75mg and 7.5mg strengths in the UK.

A 3.75mg dose may be selected for:

• an older or frail adult;
• someone with liver impairment;
• someone with kidney impairment;
• a person with chronic breathing problems; or
• someone considered more sensitive to sedating medicines.

If 3.75mg is not producing the expected effect, this does not mean that you should independently take two tablets or move to 7.5mg.

A higher strength can increase exposure to:

• next-day drowsiness;
• impaired concentration;
• dizziness;
• poor coordination;
• confusion;
• falls; and
• breathing problems when combined with other depressants.

Dose changes must be based on a professional assessment of benefit and risk.

7. Stress and Sleep Anxiety May Be Keeping You Awake

After several bad nights, bedtime itself can become stressful.

You may begin monitoring every sensation, checking the time or worrying that the tablet will fail. This increases mental alertness and can create a cycle:

1. You worry about not sleeping.
2. The worry makes your mind and body more alert.
3. Sleep becomes harder.
4. You watch the clock or try harder to force sleep.
5. The next bedtime feels even more stressful.

This does not mean that the sleep problem is imaginary. It means that anxiety may have become part of the insomnia.

Cognitive behavioural therapy for insomnia, known as CBT-I, helps address behaviours and thoughts that keep this cycle going. NICE recommends CBT-I as the first-line treatment for chronic insomnia in adults.

8. Caffeine, Nicotine or Alcohol May Be Disrupting Sleep

Caffeine and nicotine can increase alertness and make sleep more difficult. Their effects may continue for hours, depending on the amount and the individual.

Sources of caffeine include:

• coffee;
• tea;
• energy drinks;
• cola;
• chocolate;
• pre-workout products; and
• some headache or cold remedies.

Alcohol may initially make someone feel sleepy, but it can disrupt sleep later in the night. More importantly, alcohol should not be mixed with zopiclone.

The NHS warns that alcohol can dangerously increase zopiclone’s effects, cause breathing problems and make someone very difficult to wake.

Do not use alcohol as a way to make zopiclone work more strongly.

9. Rare Psychiatric or Paradoxical Reactions Can Occur

Zopiclone normally has a calming effect, but unusual reactions have been reported.

These may include:

• restlessness;
• agitation;
• irritability;
• aggression;
• nightmares;
• hallucinations;
• confusion;
• abnormal behaviour; or
•  

If you become unusually agitated, confused or behave in a way that is not normal for you after taking zopiclone, seek prompt medical advice before taking another dose.

Zopiclone can also cause complex sleep behaviours, including sleepwalking or doing activities while not fully awake. Obtain urgent professional advice if this happens.

10. Rebound Insomnia or Withdrawal May Be Involved

If zopiclone has been used regularly and is then suddenly reduced or stopped, insomnia may temporarily return more severely. This is known as rebound insomnia.

Other possible withdrawal symptoms include:

• anxiety;
• agitation;
• sweating;
• shaking;
• headaches;
• palpitations;
• nightmares;
• confusion;
• nausea; and
• muscle discomfort.

Dependence can occur even when a medicine has been taken as prescribed. It is not the same as addiction.

Do not stop regular zopiclone treatment suddenly unless a healthcare professional instructs you to do so. A personalised gradual reduction may be required.

Read more about zopiclone tolerance, dependence and withdrawal.

What Should You Do Tonight?

If your prescribed zopiclone has not helped, follow these safety steps:

1. Do not take another dose.
   Zopiclone must not be taken again during the same night.
2. Do not add alcohol.
   Alcohol can dangerously increase sedation and breathing risks.
3. Do not add another sleeping medicine.
   This includes sedating antihistamines, benzodiazepines, opioids or herbal sleep products unless specifically approved.
4. Do not drive or operate machinery.
   Zopiclone can impair alertness even when it has not helped you sleep.
5. Record what happened.
   Note the dose, timing, other medicines, caffeine and your approximate sleep.
6. Use a quiet, low-stimulation routine.
   Avoid repeatedly checking the clock or using bright screens in bed.
7. Follow the next dose on your prescription.
   Do not compensate for a poor night by increasing the following dose.

If you have taken more than prescribed, follow the NHS urgent advice for zopiclone immediately.

What Should You Discuss With Your Prescriber?

Tell your prescriber clearly:

• whether zopiclone never worked or has stopped working;
• how many nights you have used it;
• the prescribed strength;
• whether you have taken any extra doses;
• when you take it;
• how long you remain awake;
• whether you wake during the night;
• all other medicines and supplements;
• caffeine, nicotine, alcohol and substance use;
• side effects;
• snoring or breathing pauses;
• pain, anxiety, depression or menopause symptoms; and
• how insomnia is affecting daytime safety.

The prescriber may:

• review whether zopiclone remains suitable;
• check for interactions;
• investigate the cause of insomnia;
• review the dose without automatically increasing it;
• create a gradual stopping plan;
• recommend CBT-I;
• treat an underlying condition;
• consider a different treatment; or
• refer you for further assessment.

Completing a review does not guarantee that a stronger dose or replacement sleeping medicine will be prescribed.

What Not to Do When Zopiclone Stops Working

Avoid these common and potentially dangerous actions:

• taking a second dose during the same night;
• taking two tablets instead of one;
• changing from 3.75mg to 7.5mg yourself;
• combining zopiclone with alcohol;
• combining it with opioids or another sedative;
• using someone else’s medicine;
• obtaining additional tablets from an unregulated source;
• hiding other medicine or substance use from the prescriber;
• driving because the tablet “did not feel effective”; or
• suddenly stopping after regular use without advice.

Feeling that a higher dose is necessary should trigger a review, not self-adjustment.

Longer-Term Treatment When Zopiclone Is Not Enough

The NHS insomnia guidance explains that sleeping pills are generally prescribed for only a few days or weeks because of side effects and dependence risks.

Long-term treatment may involve:

• CBT-I;
• a consistent daily wake-up time;
• morning daylight;
• reducing late caffeine and nicotine;
• avoiding alcohol;
• treating pain;
• reviewing anxiety or depression;
• screening for sleep apnoea;
• checking for restless legs;
• reviewing medicines that disturb sleep; and
• using a structured sleep diary.

Basic sleep habits can help, but chronic insomnia is not always solved by generic “sleep hygiene” alone. A structured assessment and CBT-I may be necessary.

You can also read these non-medicine approaches to insomnia.

When Should You Get Medical Help?

Arrange a prompt review if:

• zopiclone repeatedly fails to help;
• it worked before but has become weaker;
• you feel that you need a higher dose;
• your tablets are running out earlier than expected;
• you have used it for longer than planned;
• insomnia has continued for months;
• you experience troubling side effects;
• you take opioids or other sedatives;
• you snore, choke or stop breathing during sleep; or
• poor sleep is making driving or work unsafe.

Obtain urgent medical help if:

• you have taken more than prescribed;
• you are very confused or severely agitated;
• you experience hallucinations;
• sleepwalking or another complex sleep behaviour occurs;
• you have serious breathing difficulty;
• you collapse or become difficult to wake; or
• you experience thoughts of harming yourself.

Frequently Asked Questions

Why is zopiclone not working for me?

Possible reasons include individual response, tolerance, timing, medicine interactions, severe anxiety or an untreated cause of insomnia. A clinical review is needed to identify the most likely explanation.

Can zopiclone fail to work on the first night?

Yes. Response can vary, and one unsuccessful night does not automatically prove tolerance. Do not take a second dose during the same night.

Can I take another tablet if zopiclone does not work?

No. Zopiclone should be taken as a single dose and must not be taken again during the same night. Taking an extra dose can be dangerous.

Does zopiclone stop working after a few weeks?

It can become less effective with repeated or chronic use. The NHS calls this tolerance. Treatment is therefore normally limited to a short period.

Is zopiclone 3.75mg too weak?

The 3.75mg strength may have been selected because of age, health, breathing risk or sensitivity to sedatives. Only the prescriber should decide whether the dose needs changing.

Can I take two 3.75mg tablets?

Two 3.75mg tablets contain 7.5mg in total. Take this amount only when it is explicitly stated on your prescription label or directed by your prescriber.

Can other medicines make zopiclone less effective?

Yes. Certain medicines and St John’s wort may reduce zopiclone levels. Other medicines may increase its effects and risks. Ask a pharmacist to review everything you take.

Does caffeine stop zopiclone from working?

Caffeine does not simply cancel zopiclone, but it can increase alertness and worsen insomnia. Late caffeine use may therefore make sleep more difficult.

Should I stop zopiclone if it is not working?

Do not suddenly stop regular treatment without professional advice. Withdrawal and rebound insomnia may occur. Ask whether you need a gradual reduction plan.

What if anxiety is keeping me awake despite zopiclone?

Anxiety may continue to maintain insomnia even when a sleeping medicine is used. Speak with a healthcare professional about treating the anxiety and consider CBT-I.

Is zopiclone suitable for long-term insomnia?

Zopiclone is primarily used for short-term insomnia. Chronic insomnia should be assessed for underlying causes, and CBT-I is recommended as a first-line treatment.

Conclusion

If zopiclone is not working, taking more is not the safe answer.

One poor night may reflect individual variation, timing or severe insomnia. A repeated reduction in effect may indicate tolerance, an interaction or an untreated sleep condition.

Do not repeat the dose during the same night, move to a higher strength independently, mix it with alcohol or stop regular treatment suddenly.

Record what is happening and arrange a review with your GP, pharmacist or prescriber. The goal should be to identify the cause of poor sleep and choose the safest treatment—not simply to increase sedation.