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Promazine Hydrochloride 25 mg/5 ml oral syrup – patient leaflet, side effects, dosage

Last updated: · Text from the MHRA, as of · About this document

Medicine status: Prescription only (POM) Details

Medicine strength:
25 mg/5 ml (5 mg/ml)
Contains active substance:
ATC code:

Patient leaflet - Promazine Hydrochloride 25 mg/5 ml oral syrup

1. What Promazine Syrup is and what it is used for

The name of your medicine is Promazine hydrochloride 25 mg/5 ml or 50 mg/5 ml Oral Syrup (referred to as Promazine Syrup in this leaflet). It contains promazine hydrochloride. This belongs to a group of medicines called phenothiazines. Promazine can be used to calm your emotions, particularly if you feel restless and agitated.

2. What you need to know before you take Promazine Syrup

Do not take Promazine Syrup and tell your doctor if:

  • you are allergic (hypersensitive) to promazine or

    medicines like promazine or any other ingredients in this liquid (listed in section 6). The signs of an allergic reaction can include a rash, itching or shortness of breath

  • you are pregnant or breastfeeding
  • you have bone marrow depression. This means

    that your immune system is not working as well as usual. Your body will find it harder to fight infection

  • you have a tumour of your adrenal gland that causes

    high blood pressure (phaeochromocytoma)

  • you have dulled senses such as feeling sleepy

    or uncoordinated, having blurred vision, slurred speech or being less aware of your surroundings (CNS depression).

  • you have moderate or severe liver problems
  • you have heart problems such as an unusually

    fast heartbeat or unstable blood pressure, causing dizziness, light-headedness or fainting. Do not take this medicine if any of the above apply to you. If you are not sure, talk to your doctor or pharmacist before taking Promazine Syrup.

Warnings and precautions

Talk to your doctor, or pharmacist or nurse before taking Promazine Syrup, if:

  • you have liver problems or a history of jaundice

    (yellowing of the skin and whites of the eyes)

  • you have a history of blood problems including

    low levels of potassium or magnesium

  • you or someone else in your family has a history

    of blood clots, as medicines like these have been associated with the formation of blood clots

  • you have heart problems including unusual

    heartbeats, heart disease or heart failure

  • you have lung and breathing problems
  • you have kidney problems
  • you have Parkinson’s Disease
  • you have had a stroke or you have any of the

    following that can increase your risk of having a stroke

    • a heart attack
    • a TIA (transient ischaemic attack). This is a

      type of stroke where symptoms last less than 24 hours

    • an artificial heart valve
    • uncontrolled high blood pressure
    • diabetes
    • high cholesterol
    • a family history of strokes
    • you smoke
    • you drink excess alcohol (this tends to weaken

      blood vessels and can raise blood pressure)

  • you have epilepsy
  • you have or have had in the past narrow-angle

    glaucoma (this is abnormal pressure in the eye accompanied by pain and blurred vision)

  • you have an underactive thyroid
  • you have a condition that causes muscle

    weakness with tiredness, called myasthenia gravis

  • you have an enlarged prostate gland
  • older people should take promazine with caution

    in very hot or cold weather. This is because there is a risk of having a higher body temperature than usual in hot weather (hyperthermia) and a lower body temperature in cold weather (hypothermia) if you take this medicine

  • if you are going to have an anaesthetic, tell your

    doctor or dentist that you are taking promazine.

Other important information to take into account before you take this medicine:

  • if you or members of your family have heart

    problems (including heart failure, heart attack or uneven heartbeats) or you have low potassium or magnesium in your blood, your doctor may do some tests on your heart and blood before giving you this medicine

  • your doctor may also want to give you regular

    blood and eye tests during your treatment

    • do not go into direct sunlight if you are

      taking high doses of this medicine. This is because you may become more sensitive to strong sunlight while taking this medicine.

If you are not sure if any of the above apply to you, talk to your doctor or pharmacist before taking Promazine Syrup.

Other medicines and Promazine Syrup. Tell your doctor or pharmacist if you are taking, have recently taken or might take any other medicines. This includes medicines you buy without a prescription, including herbal medicines. This is because promazine can affect the way some other medicines work. Also, some medicines can affect the way promazine works.

Tell your doctor if you are taking any of these medicines:

  • heart medicines such as quinidine, disopyramide, procainamide, amiodarone, sotalol, dofetilide, bretylium
  • medicines to treat high blood pressure
  • medicines that control your emotions such as chlorpromazine, trifluoperazine, antidepressants such as amitriptyline and maprolitine, pimozide, sertindole, haloperidol, lithium, MAOIs (Monoamine Oxidase Inhibitors), reboxetine
  • medicines that dull the senses such as sleeping tablets
  • medicines to treat epilepsy
  • medicines used to treat malaria such as quinine and mefloquine
  • antibiotics such as sparfloxacin, moxifloxacin and intravenous erythromycin
  • medicines used to treat Parkinson’s Disease such as levodopa
  • medicines to treat allergies such as hay fever

    (antihistamines) for example terfenadine

  • medicines used to treat stomach problems such as cimetidine and cisapride
  • medicines to treat diabetes, for example, chlorpropamide, glibenclamide, gliclazide or tolbutamide
  • strong painkillers such as codeine
  • medicines used to stop the body from producing red blood cells such as carbamazepine, co-trimoxazole, chloramphenicol, sulphonamides, pyralizone, azapropazone, penicillamine and cytotoxics (used in cancer treatment)
  • medicines that help the body get rid of water and affect electrolyte balance (diuretics) such as furosemide or indapamide
  • metoclopramide, used to treat nausea (feeling sick) and vomiting
  • tetrabenazine, used to treat disorders that cause unnatural movements
  • ritonavir, used to treat HIV and AIDS
  • tramadol, used to treat pain
  • sympathomimetics, medicines that copy the effects of substances such as adrenaline that naturally occur in the body, for example, salbutamol or pseudoephedrine.
  • memantine, used to treat Alzheimer’s disease
  • kaolin, used to treat diarrhoea.

Promazine Syrup with food, drink and alcohol

You must not drink alcohol whilst taking this medicine. This is because this medicine may make you feel drowsy and drinking alcohol will make you even more drowsy. Drinking alcohol may also affect the condition you are suffering from.

Pregnancy and breast-feeding

If you are pregnant or breastfeeding, think you may be pregnant or are planning to have a baby, ask your doctor for advice before taking this medicine. You should not use this medicine if you are pregnant or breastfeeding unless your doctor feels it is absolutely necessary.

The following symptoms may occur in newborn babies, of mothers who have used promazine in the last trimester (last three months of their pregnancy): shaking, muscle stiffness and/or weakness, sleepiness, agitation, breathing problems, and difficulty in feeding. If your baby develops any of these symptoms you may need to contact your doctor.

Driving and using machines

Do not drive or use tools or machines if this medicine makes you drowsy or gives you blurred vision. When using this medicine, alcohol and some other medicines may make you feel more drowsy than usual.

Promazine Syrup contains:

  • Methyl hydroxybenzoate (E218), Ethyl hydroxybenzoate (E214) and Propyl hydroxybenzoate (E216). May cause allergic reactions (possibly delayed).
  • Propylene glycol (E1520). This medicine contains

    100mg propylene glycol in each 5ml.

  • Liquid glucose. This medicine contains 250mg glucose in each 5ml.

This should be taken into account in patients with diabetes mellitus. If you have been told by your doctor that you have an intolerance to some sugars, contact your doctor before taking this medicinal product. May be harmful to the teeth.

  • Sucrose. This medicine contains 2.38g sucrose in each 5ml.

This should be taken into account in patients with diabetes mellitus. If you have been told by your doctor that you have an intolerance to some sugars, contact your doctor before taking this medicinal product. May be harmful to the teeth.

160 mm

3. How to take Promazine Syrup:

Always take this medicine exactly as your doctor or pharmacist has told you. Check with your doctor or pharmacist if you are not sure.

Taking this medicine

  • This medicine contains either 25mg or 50mg of

    promazine hydrochloride in each 5 ml.

  • Take this medicine by mouth
  • Use the dosing cup supplied in the pack
  • If you feel that the effect of your medicine is

    too strong or too weak, do not change the dose yourself, but talk to your doctor or pharmacist. Adults

  • The recommended dose for adults is 100 mg to

    200 mg up to four times a day

  • The dose prescribed and how often you should

    take the doses will depend upon the condition being treated and on your response. You will start treatment on a low dose, which will be increased as necessary by your doctor.

Elderly

  • The recommended dose is 25 mg initially,

    increasing to up to 50 mg, four times a day. You will receive the lowest effective dose for the shortest period possible.

Children

This product should not be given to children. Instructions for use: measuring cup

  1. 1. Shake the bottle well before use.
  2. 2.

    Fill the measuring cup to the millilitre (ml) dose

    marker prescribed by your doctor.

  3. 3. Swallow the dose of syrup.

If you take more Promazine Syrup than you should

Talk to a doctor or go to a hospital straight away. Take the medicine pack with you so the doctor knows what you have taken. Signs of an overdose may include deep sleep, feeling agitated, feeling excited, fits and coma.

If you forget to take Promazine Syrup

  • Do not take a double dose (two doses at the

    same time) to make up for forgotten doses

  • Skip the missed dose then go on as before.

If you stop taking Promazine Syrup

Keep taking Promazine Syrup until your doctor tells you to stop. The doctor will lower your dose gradually.

If you stop taking the medicine suddenly you may get withdrawal symptoms. Signs include:

  • feeling or being sick, sweating and difficulty

    sleeping (insomnia)

  • your original symptoms becoming worse
  • movements that you can’t control.

If you have any further questions about the use of this medicine, ask your doctor, pharmacist or nurse.

4. Possible side effects

Like all medicines, Promazine can cause side effects, although not everybody gets them.

Stop taking Promazine Syrup straight away and see your doctor if:

  • you have an allergic reaction to promazine syrup

    An allergic reaction may include any kind of skin

    rash, flaking skin, boils or sore lips and mouth, sudden wheezing, fluttering or tightness of the chest or collapse.

  • you have any of the following symptoms:

    • unusually fast heartbeat, unstable blood

      pressure (feeling dizzy, light-headed or faint) and sweating. These are early warning signs of a disorder caused by the type of medicine you are taking

    • very high body temperature, muscle stiffness

      or a change in consciousness leading to coma

    • yellowing of the skin and whites of your

      eyes (jaundice) with fever and possible liver damage.

If you get any of the following side effects, see your doctor as soon as possible:

  • blood clots in the veins especially in the legs

    (symptoms include swelling, pain and redness in the leg), which may travel through blood vessels to the lungs causing chest pain and difficulty in breathing. If you notice any of these symptoms seek medical advice immediately

  • lack of emotion
  • fits
  • blood problems. You may notice signs such as

    high temperature or chills, sore throat, ulcers in your mouth or throat, unusual tiredness, yellowing of the skin, weakness or breathlessness

  • heart changes including fast heartbeats, unusual

    heartbeats, and heart attack. Symptoms of a heart attack are chest pain which may spread to the shoulders, neck or arms and shortness of breath. If you get these see a doctor straight away. Unexplained deaths have been reported but it is not proven that they were caused by promazine

  • fever
  • low body temperature
  • low blood pressure. You may feel dizzy when

    standing up

  • unusual movements, often of the mouth, lips,

    eyes and tongue. These movements can also include trembling and shaking of the hands and feet, twisting of the body, shuffling walk and stiffness of the arms and legs and unable to sit still

  • eye changes such as blurred vision, clouding of

    the lens or purple colouring of the eye

  • feeling confused, agitated or over-excited
  • eye changes such as pain in the eye, blurred

    vision or loss of vision, seeing halos around lights, clouding of the lens or purple colouring of the eye.

    Tell your doctor if you get any of these side effects:

    • unable to sleep, feeling sleepy, drowsy

      or dizzy

    • dry mouth, blocked nose
    • constipation, difficulty in passing water

      particularly if you have an enlarged prostate

    • skin rash caused by medicine spilt on

      your skin, skin rashes, skin reaction to direct sunlight

    • swelling of the breasts (particularly in men) and breast milk production
    • sexual impotence n headache, upset stomach
    • light periods or absence of periods
    • weight gain.

In elderly people with dementia, a small increase in the number of deaths has been reported for patients taking antipsychotics compared with those not receiving antipsychotics.

Reporting of side effects

If you get any side effects, talk to your doctor or pharmacist or nurse. This includes any possible side effects not listed in this leaflet. You can also report side effects directly via the Yellow Card Scheme at: www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store. By reporting side effects you can help provide more information on the safety of this medicine.

5. How to store Promazine Syrup

Keep this medicine out of the sight and reach of children.

Do not use this medicine after the expiry date, which is stated on the carton after EXP. The expiry date refers to the last day of that month.

Store below 25ºC. Store in the original bottle in order to protect from light.

After first opening, use within 15 days.

Do not use this medicine if you notice that the appearance or smell of your medicine has changed. Talk to your pharmacist

Do not throw away any medicines via wastewater or household waste. Ask your pharmacist how to dispose of medicines no longer required. These measures will help to protect the environment.

6. Contents of the pack and other information

What Promazine Syrup contains

The active substance is promazine hydrochloride. Each 5ml of the syrup contains 25 mg or 50 mg of promazine hydrochloride.

The other ingredients are propylene glycol (E1520), methyl para hydroxybenzoate (E218), ethyl para hydroxybenzoate (E214), propyl para hydroxybenzoate (E216), sucrose, liquid glucose, ascorbic acid (E300), tutti frutti flavour and purified water.

What Promazine Syrup looks like and contents of the pack

Promazine hydrochloride 25 mg/5 ml and 50 mg/5 ml oral syrup is a colourless to orange-brown colour syrup.

Each carton contains 1 amber glass bottle with a child-resistant cap and a 30 ml measuring cup (graduated at every 2.5 ml equivalent to either 12.5 mg or 25 mg promazine hydrochloride).

Marketing Authorisation Holder

Zydus Pharmaceuticals UK Ltd

Sandretto Building, Cavalry Hill Industrial Park, Weedon, Northampton, NN7 4PP, UK

Manufacturer:

LM Manufacturing Limited

Sandretto Building, Cavalry Hill Industrial Park, Weedon, Northampton, NN7 4PP, UK

This leaflet was last revised on 03/2026.

To request a copy of this leaflet in Braille, large print or audio format, contact the licence holder at the above address or telephone: 0800 995034 / email: drugsafety@zydusuk.com

Material Code

About this document

Source: MHRA - Medicines and Healthcare products Regulatory Agency (products.mhra.gov.uk) · Marketing authorisation: PL 58839/0070

Last revision stated in the text: March 2026 · MHRA data as of 13 October 2026

Found a mistake? Tell us on the contact page.

The information on this site does not replace the advice of a doctor or pharmacist.

Facts about Promazine Hydrochloride 25 mg/5 ml oral syrup

Prescription needed? Yes, prescription-only medicine (POM)
Active substance Promazine
Strength 25 mg/5 ml (5 mg/ml)
Pharmaceutical form Oral solution
A colourless to orange-brown coloured syrup.
How is it taken Oral
Excipients Propylene glycol (E1520), Methyl hydroxybenzoate (E218), Ethyl hydroxybenzoate (E214), Propyl hydroxybenzoate (E216), Sucrose, Liquid Glucose, Ascorbic acid (E300), Tutti Frutti Flavour, Purified water
Is it available? Listed as available (NHS Dictionary of Medicines and Devices – not a record of current supplies)
Shelf life 18 Months
Use within 15 days of opening the bottle
Storage Store below 25°C.
Store in the original bottle in order to protect from light
Drug group (ATC) Phenothiazines with aliphatic side-chain
  1. N Nervous system drugs
    1. N05 Psycholeptics
      1. N05A Antipsychotics
        1. N05AA Phenothiazines with aliphatic side-chain, antipsychotics
          1. N05AA03 promazine
Marketing authorisation PL 58839/0070 (first authorised 20 May 2026)
Marketing authorisation holder Zydus Pharmaceuticals UK Ltd
Codes BNF 04020100

Sources: the MHRA product information (products.mhra.gov.uk) and the NHS Dictionary of Medicines and Devices (dm+d), release 10.1.0 of 12 October 2026, NHS Business Services Authority. Contains public sector information licensed under the Open Government Licence v3.0.