Mirtazapine: What to Expect and Common Side Effects

Mirtazapine is an antidepressant used mainly to treat depression. It is sometimes chosen when low mood occurs alongside poor sleep, anxiety, reduced appetite or weight loss because the medicine can be sedating and can increase appetite. Those same effects can also become its most troublesome side effects.

People often notice mirtazapine's effect on sleep before they notice an improvement in depression. The first tablet may make someone unusually sleepy, while the antidepressant benefit usually develops much more gradually. NHS guidance says some improvement may be noticeable after around a week, but the full benefit commonly takes 4 to 6 weeks.

The first few weeks can therefore feel slightly confusing. Sleep may improve while mood has not yet changed. Appetite may increase before energy returns. Morning grogginess may be strong initially and then become easier as the body adjusts. Some people find mirtazapine extremely helpful; others decide that sedation, appetite changes or weight gain outweigh the benefit.

Mirtazapine should not be stopped suddenly simply because it feels ineffective after a few days or because side effects appear. Treatment should be reviewed with the prescriber, and when the medicine is eventually stopped, the dose is usually reduced gradually to reduce withdrawal symptoms.

What is mirtazapine and why is it prescribed?

Mirtazapine is an antidepressant medicine. It changes signalling involving several chemical messengers in the brain, particularly noradrenaline and serotonin.

It belongs to a different antidepressant group from selective serotonin reuptake inhibitors such as sertraline, fluoxetine and citalopram.

In the UK, mirtazapine is licensed for treating episodes of major depression in adults. Clinicians may also use it in selected situations outside its formal licence, for example when anxiety or another condition accompanies depression.

It is available as:

• standard tablets;
• tablets that dissolve in the mouth;
• oral liquid.

Mirtazapine is often taken once daily in the evening because it can cause significant sleepiness.

Why might a doctor choose mirtazapine?

Antidepressant choice is not simply about which drug is “strongest”. The likely side effects can sometimes be used to match treatment to the person's symptoms.

Mirtazapine may be attractive when depression is accompanied by:

• difficulty falling asleep;
• frequent waking;
• early-morning waking;
• poor appetite;
• weight loss;
• significant anxiety;
• sexual side effects from another antidepressant.

By contrast, someone already struggling with excessive sleepiness, increased appetite or unwanted weight gain may prefer another option.

For a broader explanation of how antidepressants fit into treatment, see our guide to depression symptoms and treatment in the UK.

Is mirtazapine a sleeping tablet?

No. Mirtazapine is an antidepressant, not a conventional sleeping medicine.

Its antihistamine activity can nevertheless make people sleepy, sometimes from the first dose. For someone whose depression has caused severe insomnia, that may be useful.

This does not mean mirtazapine should automatically be prescribed purely as a sleeping tablet. Long-term treatment needs to make sense in the context of the person's mental health, physical health and other medicines.

Is it used for anxiety?

It may be used when significant anxiety occurs alongside depression, and specialists sometimes prescribe it off-label for anxiety disorders.

People whose main problem is anxiety should still receive an appropriate assessment because psychological therapies, SSRIs and other treatments may be more suitable depending on the diagnosis.

See our guide to anxiety disorder symptoms and treatment options.

What should you expect during the first few weeks?

Mirtazapine often produces side effects before it produces its full antidepressant effect.

This is one of the most important things to understand before starting treatment. Feeling sleepy on night one does not mean the depression should also improve by morning.

The first few days

Possible early experiences include:

• strong evening sleepiness;
• longer sleep than usual;
• difficulty waking;
• feeling heavy or groggy in the morning;
• dry mouth;
• increased appetite;
• vivid dreams;
• dizziness when getting up;
• headache;
• constipation.

Some people describe the first tablet as surprisingly sedating. Others notice very little.

If the medicine makes you sleepy or affects concentration, do not drive, cycle or operate machinery until you know how it affects you.

Week one

Sleep may improve relatively quickly. Anxiety may occasionally begin to soften, but mood often remains unchanged.

Some people temporarily feel worse during the early stage of antidepressant treatment. Increased agitation, anxiety, hopelessness or suicidal thoughts should be taken seriously rather than simply endured while waiting for the medicine to work.

Weeks two to four

Side effects may begin to settle as the body adapts. Morning grogginess can become less pronounced, although appetite changes may remain.

Early signs that treatment is helping may include:

• sleep becoming more regular;
• less anxiety on waking;
• slightly better concentration;
• greater ability to complete ordinary tasks;
• less persistent negative thinking;
• small return of interest in other people or activities.

Improvement is not always experienced as suddenly “feeling happy”. Often people first notice that basic life has become slightly easier.

Weeks four to six

The antidepressant effect should be easier to judge by this stage.

If there has been no meaningful improvement after an adequate trial at a suitable dose, the prescriber should review:

• whether the diagnosis remains appropriate;
• whether the medicine is being taken consistently;
• whether the dose needs changing;
• whether another treatment should be tried;
• whether psychological therapy should be added;
• whether another physical or mental health problem is contributing.

Do not increase the dose yourself because the medicine feels ineffective.

How often should treatment be reviewed?

NICE recommends regular review after starting antidepressants. The timing depends on age, suicide risk, severity and other circumstances.

People aged 18 to 25 or those considered at increased risk of suicide generally need particularly early follow-up after starting or changing treatment.

Sleepiness, morning grogginess and vivid dreams

Sedation is one of the features that most clearly distinguishes mirtazapine from many commonly used antidepressants.

For someone who has spent months sleeping only a few hours each night, that can feel transformative. For someone who already struggles to wake for work, it can be a major problem.

Why does mirtazapine make you sleepy?

Mirtazapine strongly blocks histamine H1 receptors. Histamine is involved in wakefulness, so blocking these receptors can cause drowsiness.

The effect is often strongest soon after treatment begins.

When should it be taken?

It is commonly taken once daily before bed. Follow the exact instructions on your prescription.

If morning sedation is severe, the prescriber may suggest adjusting when the evening dose is taken rather than changing the dose yourself.

Taking it immediately before an unusually early start may leave less time for the sedative effect to wear off.

Does the tiredness improve?

It often does. Many people find the first few mornings noticeably harder and then adapt over the following days or weeks.

Persistent sedation deserves review when it:

• makes driving unsafe;
• causes repeated lateness or missed work;
• leads to sleeping through alarms;
• causes falls;
• prevents normal daytime activity;
• remains severe after the initial adjustment period.

Are lower doses more sedating than higher doses?

You may hear that 15 mg is “more sedating” than 30 mg or 45 mg.

There is a pharmacological reason why this idea exists: antihistamine effects are prominent at lower doses, while noradrenergic activity becomes more relevant as the dose increases.

However, the practical relationship is not predictable enough to assume that increasing the dose will reliably make someone less sleepy. Individual responses vary, and a higher dose can still cause substantial sedation.

A dose should therefore never be increased simply as a do-it-yourself treatment for morning grogginess.

Can mirtazapine cause vivid dreams?

Yes. Some people report unusually vivid dreams, nightmares or a change in dream recall.

This may settle with time. Speak to the prescriber if nightmares become persistent, traumatic or significantly disturb sleep.

Can it cause restless legs?

Mirtazapine has been associated with restless legs symptoms in some people.

Tell the prescriber if you develop a new irresistible urge to move your legs when resting, particularly when symptoms are worse in the evening and improve through walking.

This is different from ordinary muscle aching or feeling generally restless.

Increased appetite and weight gain

Weight gain is one of the main reasons people hesitate before starting mirtazapine and one of the main reasons some eventually stop it.

The concern is legitimate: mirtazapine can increase appetite, and some people gain weight.

It does not happen to everyone, and the amount varies considerably.

Why does appetite increase?

Mirtazapine affects histamine and serotonin receptors involved in appetite and satiety.

People may notice:

• feeling hungry sooner after meals;
• strong evening appetite;
• cravings for carbohydrate-rich or sweet foods;
• larger portions feeling easier to eat;
• more frequent snacking.

For someone who has lost weight because severe depression destroyed their appetite, this may be beneficial.

For someone already concerned about weight, the same effect may be unwelcome.

Does mirtazapine itself change metabolism?

Increased calorie intake is likely to account for much of the weight change, although medication effects on metabolism and activity may also contribute.

Sedation can indirectly reduce physical activity, especially during the first weeks.

How quickly can weight change?

Appetite can change within days. Weight gain, when it occurs, usually becomes apparent over subsequent weeks and months.

It can be useful to record weight before treatment and check periodically rather than weighing several times every day.

How can weight gain be reduced?

Practical measures include:

• keeping regular meal times;
• planning evening snacks instead of grazing continuously;
• including protein and fibre in meals;
• keeping highly calorie-dense snack foods less accessible;
• drinking water when thirst may be mistaken for hunger;
• returning gradually to physical activity as depression improves;
• monitoring weight trends rather than reacting to daily fluctuations.

Do not respond by severely restricting food. Extreme dieting can worsen mood, sleep and concentration.

When should weight gain prompt a medication review?

Talk to the prescriber if:

• weight is increasing rapidly;
• appetite feels extremely difficult to control;
• weight change is affecting physical health;
• you are considering stopping the medicine because of it;
• you have diabetes or high cardiovascular risk;
• another antidepressant may suit your priorities better.

The treatment that works best for depression is not useful if its side effects make it impossible for someone to continue taking it.

Other common side effects

Many people take mirtazapine without major problems, but several other side effects can occur.

Dry mouth

Dry mouth may be particularly noticeable overnight or on waking.

Helpful measures include:

• regular water;
• sugar-free chewing gum;
• sugar-free sweets;
• saliva-replacement products if needed;
• good fluoride dental care.

Persistent dry mouth increases the risk of tooth decay, gum problems and oral infections.

Alcohol-containing mouthwashes can worsen dryness in some people.

Constipation

Increase fibre gradually through vegetables, fruit, whole grains and pulses, and drink adequate fluid.

Regular movement can also help.

Speak to a pharmacist or GP if constipation becomes persistent, painful or severe.

Headache

Headaches may occur early in treatment and often settle.

Seek advice for a severe new headache associated with confusion, seizures, vomiting, weakness or other neurological symptoms.

Dizziness

Mirtazapine can cause dizziness, particularly when standing.

Get up slowly from bed or a chair, especially during the first days of treatment.

Falls risk deserves particular attention in older adults and when mirtazapine is combined with alcohol, sleeping tablets, opioids or other sedating medicines.

Nausea

Feeling sick can occur, although mirtazapine may cause less nausea than some serotonergic antidepressants in certain people.

Small regular meals may help. Persistent vomiting requires medical advice because dehydration and missed doses can complicate treatment.

Swelling

Some people develop peripheral oedema, causing swelling around the ankles or legs.

New or persistent swelling should be reviewed, particularly when it is one-sided, painful, associated with breathlessness or accompanied by rapid weight increase.

Sexual side effects

Mirtazapine tends to cause fewer sexual side effects than many SSRIs, which can be one reason for choosing it.

Sexual difficulties can still occur, and depression itself can reduce libido and sexual function.

Tell the prescriber if treatment is affecting sex or relationships. These side effects are legitimate reasons to reconsider medication.

Serious side effects and symptoms not to ignore

Serious reactions are uncommon, but knowing what to look for matters.

Suicidal thoughts and worsening depression

Antidepressants do not instantly remove suicide risk. During the first weeks, mood, agitation and energy can change at different speeds.

Contact the prescriber urgently if you develop:

• new or worsening suicidal thoughts;
• plans to harm yourself;
• marked agitation;
• severe hopelessness;
• unusual impulsivity;
• a sudden major deterioration in mental state.

Call 999 or attend A&E when you cannot keep yourself safe or an attempt has already been made.

Agranulocytosis and low white blood cells

Very rarely, mirtazapine can suppress bone marrow production of white blood cells. One serious form is agranulocytosis, in which neutrophils become dangerously low.

Warning symptoms include:

• unexplained high temperature;
• severe sore throat;
• mouth ulcers;
• repeated or unusually severe infections.

Seek urgent medical advice if these appear. A blood count may be needed.

Do not assume a significant sore throat is merely a cold if it develops unexpectedly while taking mirtazapine, particularly during the first weeks of treatment.

Serotonin syndrome

Serotonin syndrome is rare with mirtazapine alone but can occur, particularly when several medicines that affect serotonin are combined.

Possible symptoms include:

• marked agitation or confusion;
• high temperature;
• heavy sweating;
• rapid heartbeat;
• diarrhoea;
• muscle rigidity;
• twitching or jerking;
• overactive reflexes;
• rapid deterioration.

Seek urgent medical help for a combination of these symptoms.

Risk can increase with medicines or substances such as other antidepressants, tramadol, some opioids, lithium and certain recreational drugs.

Mania

Antidepressants can occasionally trigger or reveal mania in someone with bipolar disorder.

Warning signs include:

• needing very little sleep without feeling tired;
• unusually elevated or intensely irritable mood;
• rapid speech;
• racing thoughts;
• uncharacteristic confidence or grandiosity;
• reckless spending or sexual behaviour;
• unusual risk-taking.

Stop-and-start decisions should be made urgently with a clinician rather than independently.

Psychotic symptoms

Hallucinations, severe paranoia or markedly disorganised behaviour require urgent assessment, particularly if these are new.

Psychosis has several possible causes and does not automatically mean schizophrenia. Our guide to schizophrenia symptoms, diagnosis and treatment explains how psychosis and schizophrenia differ.

Seizures

Seizures are uncommon but require urgent medical attention, particularly when they are new.

Call 999 for a seizure lasting 5 minutes or longer, repeated seizures without recovery, significant injury or breathing difficulty.

Low sodium

Very rarely, antidepressants can contribute to low blood sodium, particularly in older adults and people taking other medicines that affect sodium balance.

Symptoms can include:

• headache;
• confusion;
• marked weakness;
• unsteadiness;
• vomiting;
• seizures in severe cases.

Liver problems

Seek medical advice if the skin or whites of the eyes become yellow, urine becomes unusually dark or severe unexplained itching occurs.

Severe skin reactions

Very rare serious skin reactions have been reported.

Seek urgent medical attention for:

• a rapidly spreading rash;
• blistering or peeling skin;
• painful sores in the mouth, eyes or genitals;
• rash accompanied by fever or significant illness.

Dose, alcohol, driving and medicine interactions

Mirtazapine is commonly prescribed in doses between 15 mg and 45 mg per day, although the dose for an individual person must be decided by the prescriber.

Treatment commonly begins at a lower dose and is adjusted according to benefit and side effects.

When should mirtazapine be taken?

It is often taken once daily before bed because of sedation.

Take it at approximately the same time and follow the directions on the medicine label.

What if you forget a dose?

For once-daily treatment, NHS advice is generally to skip the forgotten dose if you do not remember until the next day and take the next dose at the normal time.

Do not take two doses together to compensate.

If your prescription uses a different schedule, follow the instructions provided by your clinician or pharmacist.

Can you drink alcohol?

Alcohol and mirtazapine can both cause sleepiness and impaired coordination.

NHS advice is that alcohol can be consumed while taking mirtazapine, but it may make you more sleepy and unsteady. It is sensible to avoid alcohol initially until you know how the medicine affects you.

Heavy or frequent drinking can also worsen depression and sleep and may reduce the effectiveness of treatment.

Can you drive?

Do not drive, cycle or operate machinery if you feel sleepy, dizzy, slowed or unable to concentrate safely.

This is particularly important:

• during the first few days;
• after a dose increase;
• when alcohol has been consumed;
• when another sedating medicine has been added.

Other sedating medicines

Sedation can increase when mirtazapine is combined with:

• sleeping tablets;
• benzodiazepines;
• opioid pain medicines;
• sedating antihistamines;
• some antipsychotics;
• alcohol;
• other medicines that affect alertness.

Always tell the prescriber about medicines obtained from another doctor, pharmacy or online service.

Other antidepressants

Mirtazapine is sometimes deliberately combined with another antidepressant under specialist or experienced clinical supervision.

NICE notes that combining antidepressants can increase the burden of side effects and that some combinations are potentially dangerous.

Do not add, restart or borrow another antidepressant independently.

MAO inhibitors

Mirtazapine must not be combined casually with monoamine oxidase inhibitors because serious interactions can occur. Specific gaps are required when switching between these medicines.

The prescriber or pharmacist should manage the switch.

Tramadol and serotonergic medicines

Some painkillers and other drugs can contribute to serotonin toxicity when combined with antidepressants.

Tell a clinician prescribing tramadol, opioids, migraine medicines or another antidepressant that you take mirtazapine.

Recreational drugs

Mirtazapine has not been adequately studied with many recreational substances.

Cannabis may increase sleepiness, while stimulants such as cocaine or MDMA can introduce unpredictable cardiovascular and serotonin-related risks.

Being honest with the prescriber allows safer advice; it should not be treated as a reason to withhold ordinary healthcare.

Pregnancy, breastfeeding and other health conditions

Pregnancy does not automatically mean antidepressants must be stopped.

Untreated significant depression also carries risks, including poor self-care, suicide risk, sleep disruption and difficulty managing pregnancy or the postnatal period.

Pregnancy

Mirtazapine may be used during pregnancy when the clinician judges that its benefits outweigh potential risks.

Someone planning pregnancy should ideally discuss treatment before conception rather than stopping suddenly after a positive test.

Breastfeeding

Mirtazapine can sometimes be used while breastfeeding when the baby is healthy, but this requires individual advice.

The baby may be monitored for unusual sleepiness, poor feeding or inadequate weight gain.

Older adults

Older people may be more sensitive to:

• sedation;
• dizziness;
• falls;
• low sodium;
• medicine interactions;
• constipation.

Medication burden should be reviewed carefully when several sedating medicines are being used together.

Epilepsy

Mirtazapine is generally used cautiously in people with a history of seizures.

Tell the prescriber if seizures become more frequent or occur for the first time.

Liver or kidney problems

The body may clear mirtazapine more slowly when liver or kidney function is significantly reduced.

The prescriber may choose a lower dose or slower dose adjustments depending on the situation.

Heart conditions

Tell the prescriber about:

• known heart-rhythm problems;
• fainting;
• significant heart disease;
• family history of sudden cardiac death;
• other medicines affecting heart rhythm.

Most people do not need extensive cardiac testing simply to take mirtazapine, but individual risk factors matter.

Stopping mirtazapine and withdrawal symptoms

Mirtazapine is not addictive in the sense of producing a high, craving or compulsive drug-seeking behaviour.

The body can nevertheless adapt to its presence. Stopping suddenly can therefore cause withdrawal symptoms.

What does withdrawal feel like?

Possible symptoms include:

• anxiety;
• irritability;
• nausea;
• dizziness;
• headaches;
• sleep disturbance;
• vivid dreams;
• restlessness;
• flu-like sensations;
• tingling or unusual sensory symptoms;
• return of appetite or sleep problems.

Withdrawal varies enormously. Some people reduce treatment easily, while others need a much slower taper.

Withdrawal or depression returning?

The two can overlap.

Withdrawal is more likely when symptoms:

• start soon after reducing or missing medication;
• include physical symptoms that were not part of the original depression;
• improve rapidly after reinstating the medicine.

Relapse is more likely to resemble the original depression and may develop more gradually.

A clinician can help distinguish the two.

How should mirtazapine be stopped?

NHS guidance advises reducing the dose gradually rather than stopping abruptly.

Someone who has taken mirtazapine for a long time or has previously had withdrawal symptoms may need reductions over several months or longer.

There is no single tapering schedule appropriate for everyone.

The pace depends on:

• current dose;
• how long treatment has been taken;
• previous withdrawal experience;
• mental health stability;
• available tablet or liquid strengths;
• personal preference.

Do not skip alternate days as a DIY taper

Taking antidepressants intermittently can produce fluctuating medicine levels and may trigger repeated withdrawal symptoms.

A controlled reduction in the daily dose is usually preferable unless the prescriber gives different instructions.

How long should antidepressants be continued?

Stopping as soon as mood improves may increase relapse risk.

How long treatment should continue depends on:

• severity of the episode;
• number of previous episodes;
• risk of relapse;
• ongoing stressors;
• side effects;
• the person's preference.

NICE recommends regular reviews rather than leaving antidepressants on repeat indefinitely without reconsidering whether they remain useful.

How do you know whether mirtazapine is right for you?

There is no universally “best” antidepressant.

Mirtazapine may be a particularly reasonable choice when insomnia and loss of appetite are major features of depression. Someone who has experienced severe sexual dysfunction on an SSRI may also prefer its different side-effect profile.

It may be less attractive when daytime sleepiness or weight gain are already major concerns.

Questions worth discussing with the prescriber

Useful questions include:

• Why have you recommended mirtazapine for me?
• Which symptoms are we hoping it will improve?
• Which side effects should I expect first?
• When should I take it?
• When will we review whether it is working?
• What should I do if I gain significant weight?
• Which medicines or supplements should I avoid?
• How would we stop it if it does not suit me?

When should the medicine be reviewed?

Ask for review if:

• depression is worsening;
• suicidal thoughts appear or intensify;
• there has been no useful improvement after an adequate trial;
• sedation is interfering with life;
• weight gain has become unacceptable;
• you develop mania or psychotic symptoms;
• you are planning pregnancy;
• you want to stop treatment;
• you have been taking it long term without a recent review.

Medication is only one part of depression treatment

Depending on the person and severity of depression, treatment may also involve:

• cognitive behavioural therapy;
• behavioural activation;
• counselling or psychotherapy;
• improving sleep;
• reducing alcohol;
• physical activity;
• addressing work, financial or relationship stress;
• treating physical health problems;
• specialist psychiatric support for severe or complex depression.

A medicine can make recovery more possible without being expected to solve every problem that contributed to the depression.

Frequently asked questions about mirtazapine

What is mirtazapine used for?

It is an antidepressant primarily used to treat depression. It is sometimes used off-label for other mental health conditions depending on individual circumstances.

Is mirtazapine an SSRI?

No. It affects serotonin and noradrenaline through a different pharmacological mechanism from SSRIs.

Is mirtazapine a sleeping tablet?

No, but its antihistamine effect can be strongly sedating, so it may help sleep when insomnia occurs alongside depression.

How quickly does mirtazapine work?

Sleepiness may begin after the first dose. Some improvement in mental health symptoms may appear after a week, but the full antidepressant benefit commonly takes around 4 to 6 weeks.

Why do I feel worse after starting it?

Side effects can begin before the antidepressant benefit develops. Some people also experience early worsening of anxiety, agitation or mood. Significant deterioration or suicidal thoughts require prompt medical advice.

Why am I so tired on mirtazapine?

It blocks histamine receptors involved in wakefulness. Sedation may be strongest when treatment first begins and may improve as your body adapts.

Will the morning grogginess go away?

Often it becomes less severe over days or weeks. Persistent or disabling sedation should be discussed with the prescriber.

Is 15 mg more sedating than 30 mg?

Lower doses can have prominent antihistamine effects, leading to the common claim that they are more sedating. Individual responses vary, however, and increasing the dose is not a reliable or safe self-treatment for sedation.

What is the usual dose?

Adult treatment commonly falls within the range of 15 mg to 45 mg per day. Your prescribed dose depends on response, side effects and other health factors.

Can I take it in the morning?

It is generally taken in the evening because of drowsiness. Take it according to your prescription and discuss timing changes with the prescriber.

Does mirtazapine cause weight gain?

It can increase appetite and lead to weight gain, although this does not happen to everyone.

How much weight will I gain?

There is no predictable amount. Some people gain none, while others experience clinically significant change.

Why am I hungry all the time?

Mirtazapine affects receptors involved in hunger and satiety. Increased appetite can appear soon after treatment begins.

Can mirtazapine cause diabetes?

Weight gain may indirectly increase metabolic risk in susceptible people. Anyone with existing diabetes should monitor their condition according to their healthcare plan and report significant appetite or weight changes.

Does mirtazapine cause dry mouth?

Yes. Sugar-free gum, regular water and good dental hygiene can help. Persistent dryness should be discussed with a dentist, pharmacist or clinician.

Does it cause constipation?

It can. Fluid, fibre and activity may help, while persistent constipation may need pharmacist or GP advice.

Does mirtazapine cause sexual side effects?

It can, but sexual dysfunction is generally less prominent than with many SSRIs. Depression itself can also reduce libido.

Can mirtazapine cause vivid dreams?

Yes. Vivid dreams and nightmares are reported by some people.

Can it cause restless legs?

It can worsen or trigger restless legs symptoms in some people. Report a new evening urge to move the legs that improves with walking.

Can it make anxiety worse?

Some people feel more anxious or agitated early in antidepressant treatment. Persistent or severe symptoms require review.

Can mirtazapine trigger mania?

Rarely, antidepressants can trigger mania, particularly in someone with bipolar disorder. Unusually high mood, little need for sleep, rapid speech and risky behaviour require prompt assessment.

Can it cause hallucinations?

New hallucinations or severe changes in thinking are not ordinary expected side effects and should be medically assessed.

Can I drink alcohol?

Alcohol can increase sleepiness and poor coordination. It is sensible to avoid it initially and to keep alcohol limited if you drink.

Can I drive?

Only when you know the medicine does not impair your concentration, alertness or coordination. Do not drive while sleepy or dizzy.

Can I take antihistamines?

Some antihistamines are sedating and can increase drowsiness when combined with mirtazapine. Ask a pharmacist before combining them.

Can I take painkillers?

Many ordinary pain medicines can be used, but certain drugs such as tramadol have important interactions. Ask a pharmacist if you are unsure.

Can I take mirtazapine with another antidepressant?

Sometimes, but antidepressant combinations should be supervised because side effects and interaction risks increase.

Is mirtazapine addictive?

It does not usually cause craving or compulsive use, but physical adaptation occurs and withdrawal symptoms can develop if it is stopped abruptly.

What happens if I miss one dose?

If you take it once daily and do not remember until the next day, the forgotten dose is usually skipped. Do not double the next dose.

What happens if I accidentally take too much?

Seek urgent medical advice through NHS 111 or emergency services depending on the amount and symptoms. Overdose can cause marked sleepiness, confusion and heart-related effects.

Can I stop mirtazapine suddenly?

It is generally better to reduce gradually with medical guidance because sudden stopping can cause withdrawal symptoms.

How long does withdrawal last?

It varies considerably. Some people have mild short-lived symptoms, while others require a much slower taper over months.

Can I take mirtazapine long term?

Yes. NHS guidance says it is generally considered safe for long-term use when it remains beneficial, but treatment should still be reviewed regularly.

Will mirtazapine change my personality?

It should not. Successful treatment should help you feel more like yourself. Emotional blunting or feeling unlike yourself is worth discussing with the prescriber.

Does it make you emotionally numb?

Some people report emotional changes, although this is generally more commonly associated with some other antidepressants. Depression itself can also cause emotional numbness.

What should I do if I get a sore throat?

A mild ordinary sore throat has many possible causes, but an unexplained severe sore throat, fever or mouth ulcers while taking mirtazapine requires urgent medical advice because of the very rare risk of low white blood cells.

Can I take mirtazapine during pregnancy?

It may sometimes be continued or prescribed after an individual risk-benefit assessment. Do not stop antidepressants suddenly after discovering you are pregnant.

Can I breastfeed while taking it?

It may be possible when the baby is healthy, but discuss your individual circumstances with the prescriber and maternity or infant-care team.

When should I contact my doctor?

Arrange review if side effects are troublesome, there is no improvement after an adequate trial, weight gain or sedation is becoming difficult, or you want to change or stop treatment.

When is it an emergency?

Seek emergency help for immediate suicide risk, severe allergic reaction, prolonged seizure, severe serotonin-syndrome symptoms, collapse or another life-threatening reaction.