- codeine phosphate hemihydrate
POM: Prescription only medicine
This information is intended for use by health professionals
Tylex 30 mg / 500 mg effervescent tablets
Each effervescent tablet contains 500 mg of paracetamol and 30 mg of codeine phosphate hemihydrate.
Sodium: 326.6 mg per tabletAspartame (E951): 25 mg per tablet
For the full list of excipients, see section 6.1.
Round, white or off white tablets.
Tylex effervescent tablets are indicated for use in patients older than 12 years of age for the treatment of acute moderate pain which is not considered to be relieved by other analgesics such as paracetamol or ibuprofen (alone).
Tylex effervescent tablets are given orally and should be dissolved in at least half a tumblerful of water before taking. The usual dose is one or two tablets every 4 to 6 hours when necessary to a maximum daily dose of240 mg of codeine and 4 g paracetamol (up toeight tablets per day.)
Duration of treatment:
Codeine should be used at the lowest effective dose for the shortest period of time.
The duration of treatment should be limited to 3 days and if no effective pain relief is achieved the patients/carers should be advised to seek the views of a physician.
Dosage should be adjusted according to the severity of the pain and the response of the patient. However, it should be kept in mind that tolerance to codeine can develop with continued use and that the incidence of untoward effects is dose related. Doses of codeine higher than 60 mg fail to give commensurate relief of pain but merely prolong analgesia and are associated with an appreciably increased incidence of undesirable side effects.
As for adults, however a reduced dose may be required. See warnings.
Children aged less than 12 years: Codeine should not be used in children below the age of 12 years because of the risk of opioid toxicity due to the variable and unpredictable metabolism of codeine to morphine (see sections 4.3 and 4.4).
Children aged 12 to 15 years:
One tablet every 6 hours when necessary to a maximum of 4 tablets in 24 hours.
Children aged 16 to 18 years:
One to two tablets every 6 hours when necessary up to a maximum of 8 tablets in 24 hours.
Method of administration
For oral administration.
Hypersensitivity to the active substance(s) or to any of the excipients listed in section 6.1.
Tylex should not be used:
- In children under the age of 12 years.
- In all paediatric patients (0-18 years of age) who undergo tonsillectomy and/or adenoidectomy for obstructive sleep apnoea syndrome due to an increased risk of developing serious and life-threatening adverse reactions (see section 4.4).
In patients for whom it is known they are CYP2D6 ultra-rapid metabolisers.
Conditions where morphine and opioids are contraindicated e.g:
• Acute asthma (see section 4.4. and 4.8)
• Respiratory depression (see section 4.8)
• Acute alcoholism (see section 4.4 and 4.5)
• Head injuries
• Raised intra-cranial pressure
• Following biliary tract surgery
• Breastfeeding (see section 4.6)
Monoamine oxidase inhibitor therapy, concurrent or within 14 days.
Risk from concomitant use of sedative medicines such as benzodiazepines or related drugs:
Concomitant use of Tylex and sedative medicines such as benzodiazepines or related drugs may result in sedation, respiratory depression, coma and death. Because of these risks, concomitant prescribing with these sedative medicines should be reserved for patients for whom alternative treatment options are not possible.
If a decision is made to prescribe Tylex concomitantly with sedative medicines, the lowest effective dose should be used, and the duration of treatment should be as short as possible.
The patients should be followed closely for signs and symptoms of respiratory depression and sedation. In this respect, it is strongly recommended to inform patients and their caregivers to be aware of these symptoms (see section 4.5).
The risk-benefit of continued use should be assessed regularly by the prescriber.
These tablets should be used with caution in patients sensitive to the effects of opioids, e.g. the elderly (who may be sensitive to their central and gastro-intestinal effects) and debilitated patients, patients with CNS depression , hypothyroidism, Addison's disease, prostatic hypertrophy or urethral stricture, myasthenia gravis, inflammatory or obstructive bowel disorders. Care should also be observed if prolonged therapy is contemplated.
Care is advised in the administration of paracetamol to patients with severe renal or severe hepatic impairment. The hazards of overdose are greater in those with alcoholic liver disease.
Severe liver damage may occur if the maximal daily dose is exceeded, if Tylex is taken together with another paracetamol-containing product, or if Tylex is taken while consuming large amounts of alcohol.
Administration of pethidine and possibly other opioid analgesics to patients taking a monoamine oxidase inhibitor (MAOI) has been associated with very severe and sometimes fatal reactions. If the use of codeine is considered essential then great care should be taken in patients taking MAOIs or within 14 days of stopping MAOIs (see section 4.5).
These tablets contain 326.6 mg sodium/tablet and this should be taken into account when prescribing for patients for whom sodium restriction is indicated. The product also contains 25 mg aspartame/tablet and therefore care should be taken in phenylketonuria.
Although paracetamol might logically be presumed to be the best alternative analgesic in patients with aspirin sensitivity, cross reactions have been reported. Patients positively identified with aspirin induced asthma, or who have ever experienced an asthmatic reaction to aspirin or non-steroidal anti-inflammatory drugs (NSAIDs) or are at high risk of aspirin induced asthma should avoid all products that contain aspirin or NSAIDs indefinitely. In these patients paracetamol should be recommended in low or moderate dose (< 1000 mg in a single dose) unless contraindicated.
Codeine is metabolised by the liver enzyme CYP2D6 into morphine, its active metabolite. If a patient has a deficiency or is completely lacking this enzyme an adequate analgesic effect will not be obtained. Estimates indicate that up to 7% of the Caucasian population may have this deficiency. However, if the patient is an extensive or ultra-rapid metaboliser there is an increased risk of developing side effects of opioid toxicity even at commonly prescribed doses. These patients convert codeine into morphine rapidly resulting in higher than expected serum morphine levels. General symptoms of opioid toxicity include confusion, somnolence, shallow breathing, small pupils, nausea, vomiting, constipation and lack of appetite. In severe cases this may include symptoms of circulatory and respiratory depression, which may be life-threatening and very rarely fatal.
Estimates of prevalence of ultra-rapid metabolisers in different populations are summarized below:
3.4% to 6.5%
1.2% to 2%
3.6% to 6.5%
At high doses codeine has most of the disadvantages of morphine, including respiratory depression. Codeine can produce drug dependence of the morphine type, and therefore has the potential for being abused. Codeine may impair the mental/or physical abilities required for the performance of potentially hazardous tasks.
Patients should be advised that immediate medical advice should be sought in the event of an overdose, because of the risk of delayed, serious liver damage. They should be advised not to exceed the recommended dose, not to take other paracetamol-containing products concurrently, to consult their doctor if symptoms persist and to keep the product out of the reach of children.
Tylex should be used with extreme caution in adolescents between 12 and 18 years. An alternative medicine should be considered if at all possible.
Post-operative use in children
There have been reports in the published literature that codeine given post-operatively in children after tonsillectomy and/or adenoidectomy for obstructive sleep apnoea, led to rare, but life-threatening adverse events including death (see also section 4.3). All children received doses of codeine that were within the appropriate dose range; however there was evidence that these children were either ultrarapid or extensive metabolisers in their ability to metabolise codeine to morphine.
Adolescents between 12 and 18 years with compromised respiratory function
Codeine is not recommended for use in adolescents between 12 and 18 years in whom respiratory function might be compromised including neuromuscular disorders, severe cardiac or respiratory conditions, upper respiratory or lung infections, multiple trauma or extensive surgical procedures or obesity. These factors may worsen symptoms of morphine toxicity.
Sedative medicines such as benzodiazepines or related drugs:
Patients receiving other central nervous system depressants (including other opioid analgesics, e.g. benzodiazepine, tranquillisers, sedative hypnotics and alcohol) concomitantly with Tylex effervescent tablet may exhibit an additive depressant effect as the effects of CNS depressants (including alcohol) may be potentiated by codeine. When such therapy is contemplated, the dose of one or both agents should be reduced (see section 4.4).
The concomitant use of opioids with sedative medicines such as benzodiazepines or related drugs increases the risk of sedation, respiratory depression, coma and death because of additive CNS depressant effect.
Concurrent use with centrally acting muscle relaxants may increase the risk of respiratory depression.
Concurrent use of MAO inhibitors or tricyclic antidepressants with codeine may increase the effect of either the antidepressant or codeine. Concurrent use of anticholinergics and codeine may produce paralytic ileus.
MAOIs taken with pethidine have been associated with severe CNS excitation or depression (including hypertension or hypotension). Although this has not been documented with codeine, it is possible that a similar interaction may occur and therefore the use of codeine should be avoided while the patient is taking MAOIs and for 2 weeks after MAOI discontinuation.
Enzyme-inducing medicines, such as some antiepileptic drugs (phenytoin, phenobarbital, carbamazepine) have been shown in pharmacokinetic studies to reduce the plasma AUC of paracetamol to approximately 60 %. Other substances with enzyme-inducing properties, e.g. rifampicin and St. John's wort (hypericum) are also suspected of causing lowered concentrations of paracetamol. In addition, the risk of liver damage during treatment with maximum recommended doses of paracetamol will be higher in patients being treated with enzyme-inducing agents.
The speed of absorption of paracetamol may be increased by metoclopramide or domperidone and absorption reduced by cholestyramine.
The anticoagulant effect of warfarin and other coumarins may be enhanced by prolonged regular daily use of paracetamol with increased risk of bleeding; occasional doses have no significant effect.
Concurrent use of codeine with fluoxetine or paroxetine may result in inhibition of CYP2D6 which may cause opioid toxicity.
The use of Tylex effervescent tablet is not recommended during pregnancy since safety in pregnant women or nursing mothers has not been established.
A large amount of data on pregnant women indicate neither malformative, nor feto/neonatal toxicity.
Paracetamol can be used during pregnancy if clinically needed however it should be used at the lowest effective dose for the shortest possible time and at the lowest possible frequency.
Opioid analgesics may depress neonatal respiration and cause withdrawal effects in neonates of dependent mothers.
As a precautionary measure, use of Tylex effervescent tablet should be avoided during the third trimester of pregnancy and during labour.
Tylex effervescent tablet should not be used during breastfeeding (see section 4.3).
Paracetamol is excreted in breast milk but not in a clinically significant amount.
Codeine should not be used during breastfeeding (see section 4.3). At normal therapeutic doses codeine and its active metabolites may be present in breast milk at very low doses and is unlikely to adversely affect the breast fed infant.
However, if the patient is an ultra-rapid metaboliser of CYP2D6, higher levels of the active metabolite, morphine, may be present in breast milk and on very rare occasions may result in symptoms of opioid toxicity in the infant, which may be fatal.
If symptoms of opioid toxicity develop in either the mother or the infant, then all codeine containing medicines should be stopped and alternative non-opioid analgesics prescribed. In severe cases consideration should be given to prescribing naloxone to reverse these effects.
Patients should be advised not to drive or operate machinery if affected by dizziness or sedation.
This medicine can impair cognitive function and can affect a patient's ability to drive safely. This class of medicine is in the list of drugs included in regulations under 5a of the Road Traffic Act 1988. When prescribing this medicine, patients should be told:
• The medicine is likely to affect your ability to drive
• Do not drive until you know how the medicine affects you
• It is an offence to drive while under the influence of this medicine
• However, you would not be committing an offence (called 'statutory defence') if:
o The medicine has been prescribed to treat a medical or dental problem and
o You have taken it according to the instructions given by the prescriber and in the information provided with the medicine and
o It was not affecting your ability to drive safely
Reported adverse reactions seem more prominent in ambulatory than non-ambulatory patients and some of these effects may be alleviated if the patient lies down.
A tabulated list of adverse reactions are outlined below:
System Organ Class
Adverse Effects (Frequency not know)
Blood and lymphatic system disorders
Thrombocytopenia, agranulocytosis, neutropenia, leucopenia
Immune system disorders
Anaphylactic shock, hypersensitivity including skin rash may occur.
Nervous system disorders
Dizziness, sedation, headache
Ear and labyrinth disorders
Respiratory thoracic and mediastinal disorders
Nausea, vomiting, constipation, abdominal pain, pancreatitis2
Skin and subcutaneous tissue disorders
Pruritus, rash, urticaria
Very rare cases of serious skin reactions have been reported.
1 Deafness has been reported in patients after long term use of high doses of codeine – paracetamol.
2 Drug-induced pancreatitis associated with paracetamol has been reported in literature to be a rare reaction only occurring in patients taking in excess of the recommended doses. Literature reports have also associated cases of pancreatitis with codeine.
There have been cases of bronchospasm with paracetamol, but these are more likely in asthmatics sensitive to aspirin or other NSAIDs.
In clinical use of paracetamol-containing products, there have been a few reports of blood dyscrasias including thrombocytopenia and agranulocytosis but these were not necessarily causally related to paracetamol.
Anaphylaxis, angiodema and toxic epidermal necrolysis have also been associated with the use of paracetamol.
Prolonged use of a painkiller for headaches can make them worse.
Codeine can produce typical opioid effects including constipation, nausea, vomiting, dizziness, light-headedness, confusion, drowsiness and urinary retention. The frequency and severity are determined by dosage, duration of treatment and individual sensitivity.
Regular prolonged use of codeine is known to lead to addiction and tolerance. Symptoms of restlessness and irritability may result when treatment is stopped.
Reporting of suspected adverse reactions
Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions 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.
Liver damage is possible in adults who have taken 10g or more of paracetamol. Ingestion of 5g or more of paracetamol may lead to liver damage if the patient has risk factors (see below).
Risk factorsIf the patienta, Is on long term treatment with carbamazepine, phenobarbital, phenytoin, primidone, rifampicin, St John's Wort or other drugs that induce liver enzymes.Orb, Regularly consumes ethanol in excess of recommended amounts.Orc, Is likely to be glutathione deplete e.g. eating disorders, cystic fibrosis, HIV infection, starvation, cachexia.
SymptomsSymptoms of paracetamol overdosage in the first 24 hours are pallor, nausea, vomiting, anorexia and abdominal pain. Liver damage may become apparent 12 to 48 hours after ingestion. Increased levels of hepatic transaminases, lactate dehydrogenase and bilirubin may occur and the INR may increase. Abnormalities of glucose metabolism and metabolic acidosis may occur. In severe poisoning, hepatic failure may progress to encephalopathy, haemorrhage, hypoglycaemia, hypokalaemia, cerebral oedema, gastrointentinal bleeding and death. Acute renal failure with acute tubular necrosis, strongly suggested by loin pain, haematuria and proteinuria, may develop even in the absence of severe liver damage. Cardiac arrhythmias, pancreatitis and pancytopenia have been reported.
ManagementImmediate treatment is essential in the management of paracetamol overdose. Despite a lack of significant early symptoms, patients should be referred to hospital urgently for immediate medical attention. Symptoms may be limited to nausea or vomiting and may not reflect the severity of overdose or the risk of organ damage. Management should be in accordance with established treatment guidelines, see BNF overdose section.
Treatment with activated charcoal should be considered if the overdose has been taken within 1 hour. Plasma paracetamol concentration should be measured at 4 hours or later after ingestion (earlier concentrations are unreliable). Treatment with N-acetylcysteine may be used up to 24 hours after ingestion of paracetamol, however, the maximum protective effect is obtained up to 8 hours post-ingestion. The effectiveness of the antidote declines sharply after this time. If required the patient should be given intravenous N-acetylcysteine, in line with the established dosage schedule. If vomiting is not a problem, oral methionine may be a suitable alternative for remote areas, outside hospital. Management of patients who present with serious hepatic dysfunction beyond 24h from ingestion should be discussed with the NPIS or a liver unit.
Simultaneous ingestion of alcohol and psychotropic drugs will potentiate the effects of overdosage.
Symptoms of codeine overdose may include:
▪ Central nervous system depression (including respiratory depression) but this is unlikely to be severe unless the overdose is large, or there is co-ingestion with other sedative agents or alcohol;
▪ pinpoint sized pupils;
▪ nausea and vomiting;
▪ hypotension and tachycardia are possible but unlikely.
General symptomatic and supportive measures including a clear airway and monitoring of vital signs until stable. Consider activated charcoal if an adult presents within 1 hour after ingesting more than 350 mg or a child more than 5 mg/kg. Give naloxone if coma or respiratory depression is present. Naloxone is a competitive antagonist with a short half-life, so large and repeated doses may be required in a seriously poisoned patient. Observe patients for at least 4 hours after ingestion.
Pharmacotherapeutic group: codeine and paracetamol
ATC Code: N02AJ06
Paracetamol has analgesic and antipyretic actions similar to those of aspirin with weak anti-inflammatory effects. Paracetamol is only a weak inhibitor of prostaglandin biosynthesis, although there is some evidence to suggest that it may be more effective against enzymes in the CNS than those in the periphery. This fact may partly account for its well documented ability to reduce fever and to induce analgesia, effects that involve actions on neural tissues. Single or repeated therapeutic doses of paracetamol have no effect on the cardiovascular and respiratory systems. Acid-based changes do not occur and gastric irritation, erosion or bleeding is not produced as may occur after salicylates. There is only a weak effect upon platelets and no effect on bleeding time or the excretion of uric acid.
Codeine is a centrally acting weak analgesic. Codeine exerts its effect through μ opioid receptors, although codeine has low affinity for these receptors, and its analgesic effect is due to its conversion to morphine. The major effect is on the CNS and the bowel. The effects are remarkably diverse and include analgesia, drowsiness, changes in mood, respiratory depression, decreased gastrointestinal motility, nausea, vomiting and alterations of the endocrine and autonomic nervous systems. The relief of pain is relatively selective, in that other sensory modalities, (touch, vibration, vision, hearing etc) are not obtunded. Codeine, particularly in combination with other analgesics such as paracetamol, has been shown to be effective in acute nociceptive pain.
Paracetamol is readily absorbed from the gastro-intestinal tract with peak plasma concentration occurring about 30 minutes to 2 hours after ingestion. It is metabolised in the liver and excreted in the urine mainly as the glucuronide and sulphate conjugates. Less than 5% is excreted as unchanged paracetamol. The elimination half-life varies from about 1 to 4 hours. Plasma-protein binding is negligible at usual therapeutic concentrations but increases with increasing concentrations.
A minor hydroylated metabolite which is usually produced in very small amounts by mixed-function oxidases in the liver and which is usually detoxified by conjugation with liver glutathione may accumulate following paracetamol overdosage and cause liver damage.
Codeine and its salts are absorbed from the gastro intestinal tract. Ingestion of codeine phosphate produces peak plasma codeine concentrations in about one hour. Codeine is metabolised by O- & N-demethylation in the liver to morphine and norcodeine. Codeine and its metabolites are excreted almost entirely by the kidney, mainly as conjugates with glucuronic acid.
The plasma half-life has been reported to be between 3 and 4 hours after administration by mouth or intravascular injection.
Citric Acid Anhydrous E330
Sodium Hydrogen Carbonate E500
Sodium Carbonate Anhydrous E500
Ethanol 96 % (not detected in the finished product)
Store at or below 25 °C. Store in the original package in a dry place to protect from light and moisture.
Paper/aluminium laminate blister strips packed in cardboard cartons.
Pack sizes: 1, 6, 8, 24, 30, 36, 42, 48, 90, 100 and 102 tablets.
Not all pack sizes may be marketed.
No special requirements
UCB Pharma Limited
208 Bath Road
208 Bath Road, Slough, Berkshire, SL1 3WE
+44 (0) 1753 777 100
+ 44 (0) 1753 534655