Signs of morphine toxicity and overdose are drowsiness, pin-point pupils, skeletal muscle flaccidity, bradycardia, hypotension, pneumonia aspiration, respiratory depression, somnolence and central nervous system depression which can progress to stupor or coma. Circulatory failure and deepening coma may occur in more severe cases. Overdose can result in death. Rhabdomyolosis progressing to renal failure has been reported in opioid overdose.
Crushing and taking contents of a prolonged release dosage form leads to the release of the morphine in an immediate fashion; this might result in a fatal overdose.
Treatment of morphine overdose
Primary attention should be given to the establishment of a patent airway and institution of assisted or controlled ventilation.
Oral activated charcoal (50g for adults, 1 g/kg for children) may be considered if a substantial amount has been ingested within one hour, provided the airway can be protected.
The pure opioid agonists are specific antidotes against the effects of opioid overdose. Other supportive measures should be employed as needed.
In the case of massive overdose, administer naloxone 0.8 mg intravenously. Repeat at 2-3 minute intervals as necessary, or by an infusion of 2 mg in 500 ml of normal saline or 5% dextrose (0.004 mg/ml).
The infusion should be run at a rate related to the previous bolus doses administered and should be in accordance with the patient's response. However, because the duration of action of naloxone is relatively short, the patient must be carefully monitored until spontaneous respiration is reliably re-established. MST CONTINUS suspension will continue to release and add to the morphine load for up to 12 hours after administration and the management of morphine overdose should be modified accordingly.
For less severe overdose, administer naloxone 0.2 mg intravenously followed by increments of 0.1 mg every 2 minutes if required.
Naloxone should not be administered in the absence of clinically significant respiratory or circulatory depression secondary to morphine overdose.
Naloxone should be administered cautiously to persons who are known, or suspected, to be physically dependent on morphine. In such cases, an abrupt or complete reversal of opioid effects may precipitate an acute withdrawal syndrome.
2 years.
Dowex 50WX8 100-200 mesh cationic exchange resin
Xylitol
Xanthan gum
Raspberry flavour
Ponceau 4R (E124)
In normal doses, the commonest side effects of morphine are nausea, vomiting, constipation and drowsiness. With chronic therapy, nausea and vomiting are unusual with MST CONTINUS suspension but should they occur the suspension can be readily combined with an anti-emetic if required. Constipation may be treated with appropriate laxatives.
The following frequencies are the basis for assessing undesirable effects:
Very common (> 1/10)
Common (> 1/100 to < 1/10)
Uncommon (> 1/1,000 to <1/100)
Rare (> 1/10,000 to < 1/1,000)
Very rare (<1/10,000)
Not known (cannot be estimated from the available data)
|
Very Common |
Common |
Uncommon |
Not known | |
|
Immune system disorders |
Hypersensitivity |
Anaphylactic reaction Anaphylactoid reaction | ||
|
Psychiatric disorders |
Confusion Insomnia |
Agitation Euphoria Hallucinations Mood altered |
Drug dependence Dysphoria Thinking disturbances | |
|
Nervous system disorders |
Dizziness Headache Involuntary muscle contractions Somnolence |
Convulsions Hypertonia Myoclonus Paraesthesia Syncope |
Hyperalgesia | |
|
Eye disorders |
Visual disturbance |
Miosis | ||
|
Ear and labyrinth disorders |
Vertigo | |||
|
Cardiac disorders |
Palpitations |
Bradycardia Tachycardia | ||
|
Vascular disorders |
Facial flushing Hypotension |
Hypertension | ||
|
Respiratory thoracic and mediastinal disorders |
Bronchospasm Pulmonary oedema Respiratory depression |
Cough decreased | ||
|
Gastrointestinal disorders |
Constipation Nausea |
Abdominal pain Anorexia Dry mouth Vomiting |
Dyspepsia Ileus Taste perversion | |
|
Hepatobiliary disorders |
Increased hepatic enzymes |
Biliary pain Exacerbation of pancreatitis | ||
|
Skin and subcutaneous tissue disorders |
Hyperhidrosis Rash |
Urticaria | ||
|
Renal and urinary disorders |
Urinary retention |
Ureteric spasm | ||
|
Reproductive system and breast disorders |
Amenorrhoea Decreased libido Erectile dysfunction | |||
|
General disorders and administration site conditions |
Asthenia Fatigue Malaise Pruritus |
Peripheral oedema |
Drug tolerance Drug withdrawal syndrome Drug withdrawal syndrome neonatal |
The effects of morphine have led to its abuse and dependence may develop with regular, inappropriate use. This is not a major concern in the treatment of patients with severe pain.
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.
There are no pre-clinical data of relevance to the prescriber which are additional to that already included in other sections of the SPC.
Pharmacotherapeutic group: natural opium alkaloid.
ATC Code: N02A 01
Morphine acts as an agonist at opiate receptors in the CNS, particularly mu and, to a lesser extent, kappa receptors. Mu receptors are thought to mediate supraspinal analgesia, respiratory depression and euphoria, and kappa receptors, spinal analgesia, miosis and sedation.
Central Nervous System
The principal actions of therapeutic value of morphine are analgesia and sedation (i.e., sleepiness and anxiolysis).
Morphine produces respiratory depression by direct action on brain stem respiratory centers.
Morphine depresses the cough reflex by direct effect on the cough center in the medulla. Antitussive effects may occur with doses lower than those usually required for analgesia.
Morphine causes miosis, even in total darkness. Pinpoint pupils are a sign of narcotic overdose but are not pathognomonic (e.g., pontine lesions of hemorrhagic or ischemic origin may produce similar findings). Marked mydriasis rather than miosis may be seen with hypoxia in the setting of morphine overdose.
Gastrointestinal Tract and Other Smooth Muscle
Morphine causes a reduction in motility associated with an increase in smooth muscle tone in the antrum of the stomach and duodenum. Digestion of food in the small intestine is delayed and propulsive contractions are decreased. Propulsive peristaltic waves in the colon are decreased, while tone is increased to the point of spasm resulting in constipation.
Morphine generally increases smooth muscle tone, especially the sphincters of the gastrointestinal and biliary tracts. Morphine may produce spasm of the sphincter of Oddi, thus raising intrabiliary pressure.
Cardiovascular System
Morphine may produce release of histamine with or without associated peripheral vasodilation. Manifestations of histamine release and/or peripheral vasodilation may include pruritus, flushing, red eyes, sweating, and/or orthostatic hypotension.
Endocrine System
Opioids may affect the hypothalamic pituitary adrenal and hypothalamic pituitary gonadal system resulting in adrenal insufficiency or hypogonadism respectively.
Other Pharmacologic Effects
In vitro and animal studies indicate various effects of natural opioids, such as morphine, on components of the immune system; the clinical significance of these findings is unknown.
Morphine is bound to a cationic exchange resin and drug release is affected when morphine is displaced by ions in the gastrointestinal tract. Morphine is well absorbed and adequate plasma morphine levels are achieved following the recommended dosage regimen. However, first-pass metabolism occurs in the liver.
In a single-dose study in healthy volunteers, the systemic availability of morphine from MST CONTINUS suspension 30 mg was equivalent to that from an immediate release solution 30 mg (mean 91%, 95% CI 81-102%) and from MST CONTINUS tablet 30 mg (mean 101%, 95% CI 93-109%). The suspension provided a retarded plasma profile which was comparable to that of the MST CONTINUS tablet.
22 February 2018
Napp Pharmaceuticals Limited
Cambridge Science Park
Milton Road
Cambridge
CB4 0GW
United Kingdom
Do not store above 25°C.
Pack type: Surlyn lined, laminated aluminium foil sachets coated with polyethylene and clay coated Kraft paper.
Pack size: Boxboard cartons of 10, 20, 30, 60 sachets or medical sample packs of up to 14 sachets.
Not all pack sizes may be marketed.
PL 16950/0030-0034
Pregnancy
There are no or limited amount of data from the use of morphine in pregnant women.
MST CONTINUS suspension is not recommended during pregnancy and labour due to the risk of neonatal respiratory depression. Prolonged use of morphine during pregnancy can result in neonatal opioid withdrawal syndrome.
Breast-feeding
Administration to nursing mothers is not recommended as morphine is excreted in breast milk.
As with all narcotics a reduction in dosage may be advisable in the elderly, in hypothyroidism and in patients with significantly impaired renal or hepatic function. Use with caution in patients with impaired respiratory function, severe bronchial asthma, convulsive disorders, acute alcoholism, delirium tremens, raised intracranial pressure, hypotension with hypovolaemia, severe cor pulmonale, patients with a history of substance abuse, diseases of the biliary tract, pancreatitis, inflammatory bowel disorders, prostatic hypertrophy, adrenocortical insufficiency and opiate dependent patients.
Should paralytic ileus be suspected or occur during use, MST CONTINUS suspension should be discontinued immediately.
Morphine may lower the seizure threshold in patients with a history of epilepsy.
The major risk of opioid excess is respiratory depression.
Concomitant use of benzodiazepines and opioids may result in sedation, respiratory depression, coma and death. Because of these risks, concomitant prescribing of sedative medicines such as benzodiazepines or related drugs with opioids should be reserved for patients for whom alternative treatment options are not possible.
).
The patient 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 environment to be aware of these symptoms.
Patients about to undergo additional pain relieving procedures (e.g. surgery, plexus blockade) should not receive MST CONTINUS suspension for 24 hours prior to the intervention. If further treatment with MST CONTINUS suspension is indicated, then the dosage should be adjusted to the new post-operative requirement.
MST CONTINUS suspension should be used with caution post-operatively, and following abdominal surgery as morphine impairs intestinal motility and should not be used until the physician is assured of normal bowel function.
MST CONTINUS Suspension is not recommended preoperatively or within the first 24 hours post operatively.
It is not possible to ensure bio-equivalence between different brands of prolonged release morphine products. Therefore, it should be emphasised that patients, once titrated to an effective dose, should not be changed from MST CONTINUS preparations to other slow, sustained or prolonged release morphine or other potent narcotic analgesic preparations without retitration and clinical assessment.
The patient may develop tolerance to the drug with chronic use and require progressively higher doses to maintain pain control. Prolonged use of this product may lead to physical dependence and a withdrawal syndrome may occur upon abrupt cessation of therapy. When a patient no longer requires therapy with morphine, it may be advisable to taper the dose gradually to prevent symptoms of withdrawal.
Hyperalgesia that will not respond to a further dose of morphine sulfate may occur in particular in high doses. A morphine sulfate dose reduction or change in opioid may be required.
Opioids, such as morphine sulfate, may influence the hypothalamic-pituitary-adrenal or -gonadal axes. Some changes that can be seen included an increase in serum prolactin, and decreases in plasma cortisol, oestrogen and testosterone in association with inappropriately low or normal ACTH, LH or FSH levels. Clinical symptoms may be manifest from these hormonal changes.
Morphine has an abuse profile similar to other strong agonist opioids. Morphine may be sought and abused by people with latent or manifest addiction disorders. There is potential for development of psychological dependence (addiction) to opioid analgesics, including morphine. The product should be used with particular care in patients with a history of alcohol and drug abuse.
The contents of the prolonged release sachets (granules) must be suspended whole or sprinkled on to soft food and drunk immediately after , but not be broken, crushed or chewed. The administration of broken, chewed or crushed morphine (granules) leads to a rapid release and absorption of a potentially fatal dose of morphine.
Abuse of oral dosage forms by parenteral administration can be expected to result in serious adverse events which may be fatal.
Concomitant use of alcohol and MST CONTINUS suspension may increase the undesirable effects of MST CONTINUS suspension; concomitant use should be avoided.
The excipient Ponceau 4R may cause allergic reactions.
Morphine may modify the patient's reactions to a varying extent depending on the dosage and susceptibility. If affected, patients should not drive or operate machinery.
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 you have this medicine in your body over a specified limit unless you have a defence (called the 'statutory defence').
- This defence applies when:
| - 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 and in the information provided with the medicine. |
- Please note that it is still an offence to drive if you are unfit because of the medicine (i.e. your ability to drive is being affected).â€
Details regarding a new driving offence concerning driving after drugs have been taken in the UK may be found here: https://www.gov.uk/drug-driving-law
The contents of the sachet should be added to water or sprinkled onto soft food, e.g. yogurt (see 4.2 Posology and method of administration).
14 January 1994//19 November 2006
The concomitant use of sedative medicines such as benzodiazepines or related drugs such with opioids increases the risk of sedation, respiratory depression, coma and death because of the additive CNS depressant effect. The dosage and duration of concomitant use should be limited.
Drugs which depress the CNS include, but are not limited to: other opioids, anxiolytics, hypnotics and sedatives (including benzodiazepines), antipsychotics, antidepressants, general anaesthetics, phenothiazines, muscle relaxants and antihypertensives.
In a study involving healthy volunteers (N = 12), when a 60 mg controlled-release morphine capsule was administered 2 hours prior to a 600 mg gabapentin capsule, mean gabapentin AUC increased by 44% compared to gabapentin administered without morphine. Therefore, patients should be carefully observed for signs of CNS depression, such as somnolence, and the dose of gabapentin or morphine should be reduced appropriately.
Alcohol may enhance the pharmacodynamic effects of MST CONTINUS suspension; concomitant use should be avoided.
Medicinal products that block the action of acetylcholine, for example antihistamines, anti-parkinsonians and anti-emetics, may interact with morphine to potentiate anticholinergic adverse events.
Concurrent administration of antacids may result in a more rapid release of morphine than otherwise expected; dosing should therefore be separated by a minimum of two hours. Cimetidine inhibits the metabolism of morphine.
Monoamine oxidase inhibitors are known to interact with narcotic analgesics producing CNS excitation or depression with hyper- or hypotensive crisis. Morphine should not be co administered with monoamine oxidase inhibitors or within two weeks of such therapy.
Plasma concentrations of morphine may be reduced by rifampicin.
Although there are no pharmacokinetic data available for concomitant use of ritonavir with morphine, ritonavir induces the hepatic enzymes responsible for the glucuronidation of morphine, and may possibly decrease plasma concentrations of morphine.
Mixed agonist/antagonist opioid analgesics (e.g. buprenorphine, nalbuphine, pentazocine) should not be administered to a patient who has received a course of therapy with a pure opioid agonist analgesic.
