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OxyNorm 20 mg Hard Capsules

Active Ingredient:
oxycodone hydrochloride
Napp Pharmaceuticals Limited See contact details
ATC code: 
About Medicine
The Patient Information Leaflet (PIL) is the leaflet included in the pack with a medicine.
Last updated on emc: 03 May 2022

Below is a text only representation of the Patient Information Leaflet (ePIL).

The text only version may be available in large print, Braille or audio CD. For further information call emc accessibility on {phone} 0800 198 5000. The product code(s) for this leaflet are: PL 16950/0106, PL 16950/0108, PL 16950/0107.

OxyNorm 5, 10, 20 mg


OxyNorm® 5 mg, 10 mg and 20 mg capsules

Oxycodone hydrochloride

This medicine contains oxycodone which is an opioid, which can cause addiction. You can get withdrawal symptoms if you stop taking it suddenly.

Read all of this leaflet carefully before you start taking this medicine because it contains important information for you.
  • Keep this leaflet. You may need to read it again.
  • If you have any further questions, ask your doctor or pharmacist.
  • This medicine has been prescribed for you only. Do not pass it on to others. It may harm them, even if their signs of illness are the same as yours.
  • If you get any side effects, talk to your doctor or pharmacist. This includes any possible side effects not listed in this leaflet. See section 4.

In this leaflet:

1. What OxyNorm capsules are and what they are used for
2. What you need to know before you take OxyNorm capsules
3. How to take OxyNorm capsules
4. Possible side effects
5. How to store OxyNorm capsules
6. Contents of the pack and other information

1. What OxyNorm capsules are and what they are used for

This medicine has been prescribed for you for the relief of moderate to severe pain. It contains oxycodone which belongs to a class of medicines called opioids, which are ‘pain relievers’. This medicine has been prescribed for you and should not be given to anyone else. Opioids can cause addiction and you may get withdrawal symptoms if you stop taking it suddenly. Your prescriber should have explained how long you will be taking it for and when it is appropriate to stop, how to do this safely.

2. What you need to know before you take OxyNorm capsules
Do not take OxyNorm capsules if you:
  • are allergic (hypersensitive) to oxycodone, or any of the other ingredients of the capsules (listed in section 6 of this leaflet);
  • have breathing problems, such as severe chronic obstructive lung disease, severe bronchial asthma or severe respiratory depression. Your doctor will have told you if you have any of these conditions. Symptoms may include breathlessness, coughing or breathing more slowly or weakly than expected;
  • have a condition where the small bowel does not work properly (paralytic ileus), your stomach empties more slowly than it should (delayed gastric emptying) or you have severe pain in your abdomen;
  • have a heart problem after long-term lung disease (cor pulmonale);
  • have increased carbon dioxide levels in the blood. Symptoms may include dizziness, drowsiness, fatigue, shortness of breath and headache;
  • have moderate to severe liver problems. If you have other long-term liver problems you should only take these capsules if recommended by your doctor;
  • have ongoing problems with constipation;
  • are under 18 years of age.

Warnings and precautions

Talk to your doctor or pharmacist before taking these capsules if you:

  • or anyone in your family are or have ever been addicted to opioids, alcohol, prescription medicines or illegal drugs;
  • are a smoker
  • have ever had problems with your mood (depression, anxiety or a personality disorder) or have been treated by a psychiatrist for other mental illnesses);
  • have previously suffered from withdrawal symptoms such as agitation, anxiety, shaking or sweating, when you have stopped taking alcohol or drugs;
  • feel you need to take more capsules to get the same level of pain relief, this may mean you are becoming tolerant to the effects of this medicine or are becoming addicted to it. Speak to your prescriber who will discuss your treatment and may change your dose or switch you to an alternative pain reliever;
  • are elderly or weakened;
  • have an under-active thyroid gland (hypothyroidism), as you may need a lower dose;
  • have myxoedema (a thyroid disorder associated with dryness, coldness and swelling or puffiness of the skin affecting the face and limbs);
  • know you are suffering from a brain injury or tumour, or you have a head injury, severe headache or feel sick, as this may indicate that the pressure in your skull is increased;
  • have low blood pressure (hypotension);
  • have low blood volume (hypovolaemia). This can occur due to severe external or internal bleeding, severe burns, excessive sweating, severe diarrhoea or vomiting;
  • feel very lightheaded or faint;
  • have a mental disorder following use of certain medicines (toxic psychosis);
  • have inflammation of the pancreas (which causes severe pain in the abdomen and back);
  • have problems with your gall bladder or bile duct;
  • have inflammatory bowel disease;
  • have an enlarged prostate gland, which causes difficulty in passing urine (in men);
  • have poor adrenal gland function (your adrenal gland is not working properly which may cause symptoms including weakness, weight loss, dizziness, feeling or being sick), for example due to Addison’s disease;
  • have severely impaired lung function. Symptoms may include breathlessness and coughing;
  • have long term pain unrelated to cancer;
  • have a condition where your breathing stops for short periods whilst you are asleep, known as sleep apnoea;
  • have kidney or liver problems.

Taking this medicine regularly, particularly for a long time, can lead to addiction and may result in life threatening overdose. If you have concerns that you may become dependent on OxyNorm capsules, it is important that you consult your doctor. Your doctor should have explained how long you will be using it for and when it is appropriate to stop, how to do this safely.

Rarely, increasing the dose of this medicine can make you more sensitive to pain. If this happens, you need to speak to your doctor about your treatment.

Addiction can cause withdrawal symptoms when you stop taking this medicine. Withdrawal symptoms can include restlessness, difficulty sleeping, irritability, agitation, anxiety, feeling your heartbeat (palpitations), increased blood pressure, feeling or being sick, diarrhoea, loss of appetite, shaking, shivering or sweating. Your doctor will discuss with you how to gradually reduce your dose before stopping the medicine. It is important that you do not stop taking the medicine suddenly as you will be more likely to experience withdrawal symptoms.

Opioids should only be used by those they are prescribed for. Do not give your medicine to anyone else. Taking higher doses or more frequent doses of opioid may increase the risk of addiction. Overuse and misuse can lead to overdose and/or death.

Do not inject OxyNorm capsules. This can cause serious side effects including tissue death at the site of injection, infection, inflammation of the lungs and damage to the heart which may be fatal.

Sleep-related breathing disorders

OxyNorm capsules can cause sleep-related breathing disorders such as sleep apnoea (breathing pauses during sleep) and sleep related hypoxemia (low oxygen level in the blood). The symptoms can include breathing pauses during sleep, night awakening due to shortness of breath, difficulties to maintain sleep or excessive drowsiness during the day. If you or another person observe these symptoms, contact your doctor. A dose reduction may be considered by your doctor.

If you are going to have an operation, or have just had an operation, please tell the doctor at the hospital that you are taking these capsules. Your doctor may adjust your dose.

You may experience hormonal changes while taking these capsules. Your doctor may want to monitor these changes.

Other medicines and OxyNorm capsules

Taking OxyNorm capsules at the same time as other medicines that slow down the central nervous system can cause slow or difficulty breathing (respiratory depression), severe sleepiness, loss of consciousness and death. These medicines include:

  • other medicines used to treat pain known as opioids (such as codeine or morphine);
  • medicines used to treat epilepsy (gabapentinoids) such as pregabalin;
  • medicines used to treat anxiety;
  • medicines used to make you feel sleepy (such as benzodiazepines);
  • medicines used to treat psychiatric or mental disorders (such as phenothiazines);
  • anaesthetics;
  • muscle relaxants;
  • medicines used to treat high blood pressure;
  • a type of medicine used to treat depression known as monoamine oxidase inhibitors (MAOIs), such as tranylcypromine, phenelzine and isocarboxazid. You should not take OxyNorm capsules if you are currently taking this type of medicine, or have taken this medicine in the last two weeks.

Because of this, your doctor will only prescribe OxyNorm capsules where there are no other treatment options, and only in small doses for short periods of time. If you or your friends, family or caregivers notice that you are having difficulty breathing or that you have become very sleepy or lost consciousness you (or they) should inform your doctor immediately.

Taking OxyNorm capsules with medicines used to treat depression known as Selective Serotonin Re-uptake Inhibitors (SSRIs) or Serotonin Norepinephrine Re-uptake Inhibitors (SNRIs) can cause a condition known as serotonin toxicity. The symptoms of this include agitation, seeing or hearing things that aren’t real (hallucinations), loss of consciousness, a fast heartbeat, blood pressure changes, increased body temperature, muscle twitching, lack of coordination, stiffness, feeling or being sick, or diarrhoea. If you are taking SSRI or SNRI medicines such as citalopram, duloxetine, escitalopram, fluoxetine, fluvoxamine, paroxetine, sertraline or venlafaxine your doctor may reduce your dose of OxyNorm capsules.

Please tell your doctor or pharmacist if you are taking, have recently taken or might take any other medicines, including medicines obtained without a prescription.

Tell your doctor or pharmacist if you are taking any of the following medicines, as they may need to adjust your dose:

  • a type of medicine used to treat depression known as tricyclic antidepressants, such as amitriptyline, clomipramine, imipramine, lofepramine or nortriptyline;
  • medicines used to treat allergies, such as cetirizine, fexofenadine or chlorphenamine;
  • medicines used to treat Parkinson’s disease;
  • antibiotics such as clarithromycin, erythromycin or telithromycin;
  • antifungal medicines such as ketoconazole, voriconazole, itraconazole and posaconazole;
  • medicines used to treat HIV known as protease inhibitors, such as boceprevir, ritonavir, indinavir, nelfinavir or saquinavir;
  • cimetidine, a medicine used to treat stomach ulcers;
  • rifampicin, a medicine used to treat tuberculosis;
  • medicines used to treat seizures, fits or convulsions such as carbamazepine and phenytoin;
  • a herbal remedy used to treat depression known as St. John’s Wort (also known as Hypericum perforatum);
  • quinidine, a medicine used to treat an irregular heartbeat.

Taking OxyNorm capsules with food, drink and alcohol

Drinking alcohol during your treatment with these capsules may make you sleepy or increase the risk of serious side effects such as shallow breathing with a risk of stopping breathing, and loss of consciousness. It is recommended that you do not drink alcohol while you are taking OxyNorm capsules.

You should avoid drinking grapefruit juice during your treatment with this medicine.

Pregnancy and breastfeeding

Ask your doctor or pharmacist for advice before taking any medicine.


Do not take OxyNorm capsules if you are pregnant or think you might be pregnant unless you have discussed this with your doctor and the benefits of treatment are considered to outweigh the potential harm to the baby. If you take OxyNorm capsules during pregnancy your baby may become dependent and experience withdrawal symptoms after the birth which may need to be treated.


Do not take OxyNorm capsules while you are breastfeeding as oxycodone passes into breast milk and will affect your baby.

Driving and using machines

These capsules may cause a number of side effects such as drowsiness or dizziness which may affect your ability to drive or use machinery (see section 4 ‘Possible side effects’ for a full list of side effects). These are usually most noticeable when you first start taking the capsules, or when changing to a higher dose.

  • Do not drive while taking this medicine until you know how it affects you.
  • It is an offence to drive if this medicine affects your ability to drive.
  • However you would not be committing an offence if:
    • The medicine has been prescribed to treat a medical or dental problem and;
    • You have taken it according to the instructions given by the prescriber or in the information provided with the medicine and;
    • It was not affecting your ability to drive safely.

Talk to your doctor or pharmacist if you are not sure whether it is safe for you to drive while taking this medicine.

OxyNorm 5 mg capsules contain sunset yellow (E110)

The 5 mg capsules contain sunset yellow (E110) which may cause allergic reactions.

3. How to take OxyNorm capsules

Always take these capsules exactly as your doctor has told you. The label on your medicine will tell you how many capsules to take and how often.

Your doctor should have discussed with you how long the course of OxyNorm capsules will last. They will arrange a plan for stopping treatment. This will outline how to gradually reduce the dose and stop taking the medicine.

Adults (over 18 years of age)

The usual starting dose is one 5 mg capsule every 4 to 6 hours. However, your doctor will prescribe the dose required to treat your pain. If you find that you are still in pain whilst taking these capsules, discuss this with your doctor.


Children and adolescents under 18 years of age should not take the capsules.

Patients with kidney or liver problems

Please tell your doctor if you suffer from kidney or liver problems as they may prescribe a lower dose depending on your condition.

Do not exceed the dose recommended by your doctor. You should check with your doctor or pharmacist if you are not sure.

Swallow your capsules whole with water. Do not chew or crush them.

You must only take the capsules by mouth. The capsule contents should never be injected as this may lead to serious side effects, which may be fatal (see section 2 ‘Warnings and precautions’).

If you take more OxyNorm capsules than you should or if someone accidentally swallows your capsules

Call your doctor or hospital immediately. People who have taken an overdose may feel very sleepy, sick or dizzy, or have hallucinations. They may also have breathing difficulties leading to unconsciousness or even death and may need emergency treatment in hospital. When seeking medical attention make sure that you take this leaflet and any remaining capsules with you to show to the doctor.

If you forget to take OxyNorm capsules

If you remember within 4 hours of the time your capsule was due, take your capsule straight away. Take your next capsule at your normal time. If you are more than 4 hours late, please call your doctor or pharmacist for advice. Do not take a double dose to make up for forgotten capsules.

If you stop taking OxyNorm capsules

Do not suddenly stop taking this medicine. If you want to stop taking this medicine discuss this with your doctor first. They will tell you how to do this, usually by reducing the dose gradually so that any unpleasant withdrawal effects are kept to a minimum. Withdrawal symptoms such as restlessness, difficulty sleeping, irritability, agitation, anxiety, feeling your heartbeat (palpitations), increased blood pressure, feeling or being sick, diarrhoea, shaking, shivering or sweating may occur if you suddenly stop taking this medicine.

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

4. Possible side effects

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

All medicines can cause allergic reactions, although serious allergic reactions are rare. Tell your doctor immediately if you get any sudden wheeziness, difficulties in breathing, swelling of the eyelids, face or lips, rash or itching especially those covering your whole body. These may be signs of a serious allergic reaction.

The most serious side effect is a condition where you breathe more slowly or weakly than usual (respiratory depression) and can lead to severe sleepiness and loss of consciousness. This side effect may affect up to 1 in 100 people and is more likely to occur when taking certain other medicines (see section 2 ‘Other medicines and OxyNorm capsules’). Tell your doctor immediately if this happens to you. You may wish to ask your friends, family or caregivers to monitor you for these signs and symptoms.

Drug withdrawal

When you stop taking OxyNorm capsules you may experience drug withdrawal symptoms, which include restlessness, difficulty sleeping, irritability, agitation, anxiety, feeling your heartbeat (palpitations), increased blood pressure, feeling or being sick, diarrhoea, shaking, shivering or sweating.

How do I know if I am addicted?

If you notice any of the following signs whilst taking OxyNorm capsules it could be a sign that you have become addicted.

  • You need to take the medicine for longer than advised by your prescriber;
  • You feel you need to use more than the recommended dose;
  • You are using the medicine for reasons other than prescribed;
  • When you stop taking the medicine you feel unwell, and you feel better once taking the medicine again.

If you notice any of these signs it is important you talk to your doctor.

Very common side effects

(May affect more than 1 in 10 people)

  • Constipation (your doctor can prescribe a laxative to overcome this problem);
  • Feeling or being sick (this should normally wear off after a few days, however your doctor can prescribe an anti-sickness medicine if it continues to be a problem);
  • Drowsiness (this is most likely when you start taking your capsules or when your dose is increased, but it should wear off after a few days);
  • Dizziness;
  • Headache;
  • Itchy skin.

Common side effects

(May affect up to 1 in 10 people)

  • Dry mouth, loss of appetite, indigestion, abdominal pain or discomfort, diarrhoea;
  • Confusion, depression, a feeling of unusual weakness, shaking, lack of energy, tiredness, anxiety, nervousness, difficulty in sleeping, abnormal thoughts or dreams;
  • Difficulty in breathing, wheezing, shortness of breath, decreased cough reflex;
  • Rash;
  • Sweating.

Uncommon side effects

(May affect up to 1 in 100 people)

  • Withdrawal symptoms (see section ‘Drug withdrawal’);
  • Difficulty in swallowing, belching, hiccups, wind, a condition where the bowel does not work properly (ileus), inflammation of the stomach, changes in taste or unpleasant taste;
  • A feeling of dizziness or spinning (vertigo), hallucinations, mood changes, unpleasant or uncomfortable mood, a feeling of extreme happiness, disorientation, restlessness, agitation, generally feeling unwell, loss of memory, difficulty in speaking, reduced sensitivity to pain or touch, tingling or numbness, seizures, fits or convulsions, blurred or impaired vision, fainting, unusual muscle stiffness or slackness, involuntary muscle contractions or spasms;
  • Difficulty or pain in passing urine, impotence, decreased sexual drive, low levels of sex hormones in the blood (hypogonadism, seen in a blood test);
  • Fast, irregular heartbeat, palpitations, a feeling of lightheadedness, dizziness, flushing of the skin;
  • Dehydration, thirst, chills, swelling of the hands, ankles or feet;
  • Dry skin, severe flaking or peeling of the skin;
  • Redness of the face, reduction in size of the pupils in the eye, high temperature;
  • A need to take increasingly higher doses of the capsules to obtain the same level of pain relief (tolerance);
  • Colicky abdominal pain or discomfort;
  • A worsening of liver function tests (seen in a blood test).

Rare side effects

(May affect up to 1 in 1,000 people)

  • Low blood pressure or feeling faint, especially on standing up;
  • A raised, itchy rash (hives).

Frequency not known

(Frequency cannot be estimated from the available data)

  • Dependence and addiction (see section ‘How do I know if I am addicted?’);
  • An increased sensitivity to pain;
  • Aggression;
  • Tooth decay;
  • Absence of menstrual periods;
  • A blockage in the flow of bile from the liver (cholestasis). This can cause itchy skin, yellow skin, very dark urine and very pale stools;
  • Sleep apnoea (breathing pauses during sleep);
  • Long term use of OxyNorm capsules during pregnancy may cause life-threatening withdrawal symptoms in the newborn. Symptoms to look for in the baby include irritability, hyperactivity and abnormal sleep pattern, high pitched cry, shaking, being sick, diarrhoea and not putting on weight.

Reporting of side effects

If you get any side effects, talk to your doctor, 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: 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 OxyNorm capsules

Keep this medicine out of the sight and reach of children. Accidental overdose by a child is dangerous and may be fatal.

Do not use any capsules after the expiry date which is stated on the blister and carton after EXP. The expiry date refers to the last day of that month.

Do not store your capsules above 30 °C.

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

6. Contents of the pack and other information
What OxyNorm capsules contain

The active substance is oxycodone hydrochloride. Each capsule contains 5 mg, 10 mg or 20 mg of oxycodone hydrochloride.

The other ingredients are microcrystalline cellulose, magnesium stearate, titanium dioxide (E171), iron oxide (E172), indigo carmine (E132), sodium laurilsulphate, gelatin, shellac and propylene glycol.

The 5 mg capsules also contain sunset yellow (E110) (see section 2 ‘OxyNorm 5 mg capsules contain sunset yellow (E110)’).

What OxyNorm capsules look like and the contents of the pack

The capsules are marked ONR and the strength (5, 10 or 20). The capsule colours are: 5 mg – orange/beige, 10 mg – white/beige, 20 mg – pink/beige. In each box there are 56 capsules.

Marketing Authorisation Holder
Napp Pharmaceuticals Limited
Cambridge Science Park
Milton Road

Bard Pharmaceuticals Limited
Cambridge Science Park
Milton Road

This leaflet is also available in large print, Braille or as an audio CD. To request a copy, please call the RNIB Medicine Information line (free of charge) on: 0800 198 5000

You will need to give details of the product name and reference number. These are as follows:

Product name: OxyNorm Capsules

Reference number: 16950/0106

This leaflet was last revised in March 2022

® OxyNorm, NAPP and the NAPP logo are registered trade marks.

© 2009-2022 Napp Pharmaceuticals Ltd.

Napp Pharmaceuticals Limited
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Cambridge Science Park, Milton Road, Cambridge, Cambridgeshire, CB4 0GW
+44 (0)1223 424 444
Medical Information e-mail
[email protected]