Organon Laboratories Limited

Dexamethasone Tablets 2 mg

Each tablet contains 2 mg of Dexamethasone.

Excipients: Each tablet contains approximately 116mg lactose monohydrate.

For a full list of excipients, see section 6.1.

Tablet

Round, 6 mm, flat, white tablet with the code 'XC/8' engraved on one surface and 'Organon*' on the other

Dexamethasone tablets are used for the treatment of various inflammatory and autoimmune diseases e.g.:

Rheumatism, as pain, stiffness or limitation of motion, especially in the joints and related structures, including muscles, bursae, tendons, fibrous tissue;

Collagen disease, as lupus erythematosus, dermatomyositis, polyarteritis nodosa, thrombotic purpura and rheumatoid arthritis;

Allergies, as status asthmaticus, bronchial asthma, contact dermatitis, inflammatory processes of the eye and its adnexa, severe hypersensitivity reactions to drugs or insect stings, anaphylactic shock, impending allograft rejection;

Primary or secondary adrenocortical insufficiency and adrenogenital syndromes.

Besides Dexamethasone is used as an adjunct in the control of cerebral oedema (not in those cases where the oedema is caused by head injury), for treatment of lymphocytic leukaemia, as anti-emetic in antineoplastic regimens and for palliative treatment in terminal stages of neoplastic disease.

Glucocorticoids may be administered by a number of routes, depending on the nature of the disease and the condition of the patient. Localised therapy is generally preferred because it minimises adverse effects. When systemic administration is required, the oral route is preferred for ease in regulation of dose and the variety in regimens.

Dexamethasone tablets should be taken orally, preferably with some fluid.

The dosage of Dexamethasone tablets depends on the severity of the condition and the response of the patient. Undesirable effects, such as suppression of the hypothalamus- pituitary-adrenal (HPA) axis may be minimised by using the lowest effective dose for the minimum period, preferably by taking the tablet(s) in the morning and if disease control will allow alternate day therapy. Systemic dexamethasone administered in the evening is more likely to cause clinically significant HPA suppression. Alternate day dosing is not appropriate for patients with established adrenal insufficiency. Frequent patient review is required to appropriately titrate the dose against disease activity. If no favourable response is noted within a couple of days, continuation of glucocorticoid therapy is undesirable.

The usual dose in adults is 0.5-10 mg per day. As soon as symptoms diminish, the dose should be reduced under continuous observation of the clinical picture to the lowest possible level, or tapered off completely by following the withdrawal schedule below. Dexamethasone should only be administered to children with caution, since glucocorticoids can induce growth retardation. The daily dose should be determined by the physician for each child individually.

During prolonged therapy any intercurrent illness, trauma or surgical procedure will require a temporary increase in dosage.

Withdrawal of prolonged therapy

In patients who have received dexamethasone for more than 3 weeks, withdrawal should not be abrupt. How dose reduction should be carried out (tapered off over weeks or months) depends largely on whether the disease is likely to relapse as the dose of systemic glucocorticoids is reduced. Clinical assessment of disease activity may therefore be needed during withdrawal. If the disease is unlikely to relapse on withdrawal but there is uncertainty about hypothalamus-pituitary-adrenal (HPA) suppression, the dose of systemic dexamethasone may be reduced rapidly to physiological doses. Once a daily dose of approx. 1 mg dexamethasone is reached, dose reduction should be slower to allow the HPA-axis to recover.

Abrupt withdrawal of systemic dexamethasone treatment, which has continued for up to 3 weeks is appropriate if it is considered that the disease is unlikely to relapse. Abrupt withdrawal of doses up to approx. 6 mg dexamethasone for 3 weeks is unlikely to lead to clinically relevant HPA-axis suppression, in the majority of patients.

In the following patient groups, gradual withdrawal of systemic dexamethasone therapy should be considered even after courses lasting 3 weeks or less:

• Patients who have had repeated courses of systemic dexamethasone (or other corticosteroids), particularly if taken for more than 3 weeks.

• When a short course has been prescribed within one year of cessation of long-term therapy (months or years).

• Patients who may have reasons for adrenocortical insufficiency other than exogenous dexamethasone (or other corticosteroid) therapy.

• Patients receiving doses of systemic dexamethasone higher than approx. 6 mg.

• Patients repeatedly taking doses in the evening.

Patients who during systemic treatment encounter stresses such as trauma, surgery or infection and who are at risk of adrenal insufficiency should receive additional systemic dexamethasone cover during these periods. This includes patients who have finished a course of systemic dexamethasone of less than three weeks duration in the week prior to the stress. Patients on systemic dexamethasone therapy who are at risk of adrenal suppression and are unable to take tablets by mouth should receive parenteral dexamethasone cover during these periods.

Too rapid reduction of dexamethasone dosage following prolonged treatment can lead to acute adrenal insufficiency, hypotension and death. Characteristic symptoms of a “withdrawal syndrome” that may occur are fever, myalgia, arthralgia, rhinitis, conjunctivitis, painful itchy skin nodules and loss of weight.

- gastric and duodenal ulcer;

- acute infections: viral infections and systemic fungal infections (bacterial infections: see section 4.4 “Special warnings and precautions for use”);

- hypersensitivity to glucocorticoids or one of the excipients;

- parasitic infections;

- vaccination with live vaccines (see section 4.4 “Special warnings and precautions for use”);

- patients with rare hereditary problems of galactose intolerance, the Lapp lactase deficiency or glucose-galactose malabsorption should not take this medicine.

Adrenal cortical atrophy develops during prolonged therapy and may persist for years after stopping treatment. Withdrawal of corticosteroids after prolonged therapy must therefore always be gradual to avoid acute adrenal insufficiency, being tapered off over weeks or months according to the dose and duration of treatment (see “withdrawal of prolonged therapy” above). During prolonged therapy any intercurrent illness, trauma or surgical procedure will require a temporary increase in dosage; if corticosteroids have been stopped following prolonged therapy they may need to be temporarily re-introduced.

Anti-inflammatory/Immunosuppressive effects. Glucocorticoid therapy is non-specific, suppresses the symptoms and signs of disease and decreases the resistance to infections. The clinical presentation may often be atypical and serious infections such as septicaemia and tuberculosis may be masked and may reach an advanced stage before being recognised. Strong antimicrobial therapy should accompany glucocorticoid therapy when necessary.

Vaccines should not be given to individuals with glucocorticoid therapy-induced immunosuppression. Vaccination with live vaccines, e.g. Chickenpox is of particular concern. Chickenpox is a normally minor illness but may be fatal in immunosuppressed patients. Patients (or parents of children) without a definite history of chickenpox should be advised to avoid close personal contact with chickenpox or herpes zoster and if exposed they should seek urgent medical attention. Passive immunization with varicella/zoster immunoglobin (VZIG) is needed by exposed non-immune patients who are reciving systemic corticosteroids or who have used them within the previous 3 months; this should be given within 10 days of exposure to chickenpox.If a diagnosis of chickenpox is confirmed, the illness warrants specialist care and urgent treatment. Corticosteroids should not be stopped and even the dose may need to be increased.

Measles can have a more serious or even fatal course in immunosuppressed patients. In such children or adults, particular care should be taken to avoid exposure to measles. If exposed, prophylaxis with intramuscular pooled immunoglobulin (IVIG) may be indicated. Exposed patients should be advised to seek medical advice without delay.

Prolonged use of corticosteroids may produce posterior subcapsular cataracts, glaucoma with possible damage to the optic nerve and may enhance the establishment of secondary ocular infections due to fungi or viruses.

Glucocorticoids can cause dose-related growth retardation in infancy, childhood and adolescence, which may be irreversible. Therefore, Dexamethasone should only be used in children with caution.

The common adverse effects of systemic glucocorticoids may be associated with more serious consequences in old age, especially osteoporosis, hypertension, hypokalaemia, diabetes, susceptibility to infection and thinning of the skin. Close clinical supervision is required to avoid life-threatening reactions.

Particular care is required when considering the use of systemic glucocorticoids in patients with the following conditions and frequent patient monitoring is necessary:

- Osteoporosis (post-menopausal women are particularly at risk);

- Hypertension or congestive heart failure;

- Diabetes mellitus (or a family history of diabetes);

- History of tuberculosis;

- Glaucoma (or a family history of glaucoma);

- Previous glucocorticoid-induced myopathy;

- Liver failure;

- Renal insufficiency;

- Epilepsy;

- Peptic ulceration.

Patients and/or carers should be warned that potentially severe psychiatric adverse reactions may occur with systemic steroids (see section 4.8). Symptoms typically emerge within a few days or weeks of starting the treatment. Risks may be higher with high doses/systemic exposure (see also section 4.5 pharmacokinetic interaction that can increase the risk of side effects), although dose levels do not allow prediction of the onset, type, severity or duration of reactions. Most reactions recover after either dose reduction or withdrawal, although specific treatment may be necessary.

Patient/carers should be encouraged to seek medical advice if worrying psychological symptoms develop, especially if depressed mood or suicidal ideation is suspected. Patients/carers should also be alert to possible psychiatric disturbances that may occur either during or immediately after dose tapering/withdrawal of systemic steroids, although such reactions have been reported infrequently.

Particular care is required when considering the use of systemic corticosteroids in patients with existing or previous history of severe affective disorders in themselves or in their first degree relatives. These would include depressive or manic-depressive illness and previous steroid psychosis.

Rifampin, rifabutin, carbamazepine, phenobarbitone, phenytoin, primidone and aminoglutethimide enhance the metabolism of glucocorticoids and the therapeutic effects may be reduced.

The desired effects of hypoglycaemic agents (including insulin), antihypertensives and diuretics are antagonised by glucocorticoids.

The effects of anticholinesterases are antagonised by glucocorticoids in myasthenia gravis.

Concurrent use of potassium-depleting diuretics (e.g. acetazolamide, loop diuretics, thiazide diuretics or carbenoxolone) and glucocorticoids may result in severe hypokalaemia.

The efficacy of coumarin anticoagulants may be altered by concurrent glucocorticoid therapy and close monitoring of the International Normalised Ratio or prothrombin time is required.

The renal clearance of salicylates is increased by glucocorticoids and steroid withdrawal may result in salicylate intoxication.

Combination of corticosteroids with ulcer-inducing agents (e.g. NSAID's) enhances the risk of peptic ulceration.

Dexamethasone readily crosses the placenta.

There are indications for a harmful effect of glucocorticoids on the foetus in animal experiments like abnormalities of foetal development including cleft palate or lip and effects on brain growth and development. There are no adequate data from the use of dexamethasone in pregnant women to predict any effect on the emryonic or foetal development. When administered for prolonged periods or repeatedly during pregnancy, systemic glucocorticoids increase the risk of intra-uterine growth retardation (IUGR). There is no evidence for an increased incidence of IUGR following short-term treatment, such as prophylactic treatment for neonatal respiratory distress syndrome. In this case (to prevent respiratory distress syndrome), glucocorticoids are essential. Patients with pre-eclampsia or fluid retention require close monitoring. Dexamethasone should, for maternal indications, not be used during pregnancy unless clearly necessary.

Adrenal suppression in the neonate following prenatal glucocorticoid exposure is to be expected.

No data are available on the transfer of dexamethasone into breast milk. Because corticosteroids are in general excreted into breast milk, and given the lack of experience, breast feeding is discouraged during Dexamethasone therapy.

As with all medicines, before prescribing systemic glucocorticoids in pregnancy or during lactation, the benefits of treatment should be weighed against the potential risks to both mother and child.

Glucocorticoids may cause mood changes (e.g. euphoria or depression) or visual disturbances. If affected, caution should be exercised in driving and operating machinery.

The incidence of predictable undesirable effects of glucocorticoids correlates with the dosage, timing of administration and duration of treatment. The clinician must balance the therapeutic effects of glucocorticoids with their risk for adverse effects, using the lowest possible effective doses for the shortest possible period of time, preferably by dosing in the morning on an alternate day dosing regimen. Early recognition and appropriate management of adverse effects can minimise the potential severe complications of glucocorticoid therapy.

A wide range of psychiatric reactions including affective disorders (such as irritable, euphoric, depressed and labile mood, and suicidal thoughts), psychotic reactions (including mania, delusions, hallucinations, and aggravation of schizophrenia), behavioural disturbances, irritability, anxiety, sleep disturbances, and cognitive dysfunction including confusion and amnesia have been reported. Reactions are common and may occur in both adults and children. In adults, the frequency of severe reactions has been estimated to be 5-6%. Psychological effects have been reported on withdrawal of corticosteroids; the frequency is unknown.

Table 1: Adverse reactions of Dexamethasone

*The frequency of adverse reactions: not known (cannot be estimated from the available data).

In animal experiments, the acute toxicity of dexamethasone has been shown to be rather low. Symptoms of acute overdosage that can occur are nausea and vomiting. If vomiting has not yet occurred this can be provoked. For the rest a symptomatic treatment is probably sufficient.

Dexamethasone tablets contains as active ingredient dexamethasone, which is a synthetic glucocorticoid with approximately a 7 times higher anti-inflammatory potency than prednisolone and 30 times that of hydrocortisone.

Glucocorticoids are produced and secreted by the adrenal cortex and are an intrinsic part of the hypothalamus-pituitary-adrenal axis (HPA-axis). In physiological concentrations glucocorticoids, both naturally occurring (hydrocortisone or cortisone) or synthetic (like dexamethasone) exert a broad range of effects on multiple organ systems and tissues; they affect carbohydrate, protein, lipid and calcium metabolism and have effects on fluid and electrolyte balance and are important for support of normal cardiovascular structure and function and the normal function of skeletal muscle.

In target tissues glucocorticoids interact with specific receptor proteins to regulate, via the expression of glucocorticoid-responsive genes, protein synthesis. As a consequence of the time required for changes in gene expression and protein synthesis, most effects of glucocorticoids are not immediate, but become apparent after several hours. This fact is of clinical significance, because a delay generally is seen before beneficial effects of glucocorticoid therapy are observed.

Dexamethasone is therapeutically used mostly because of its anti-inflammatory and immunosuppressive properties. Dexamethasone has virtually no mineralocorticoid activity which makes it suitable for use in patients with cardiac failure or hypertension.

After ingestion, dexamethasone is rapidly and well (around 80%) absorbed. Peak plasma levels are reached between 1 and 2 hours after ingestion.

Dexamethasone is bound (up to 77%) by plasma proteins, mainly albumin. There is high uptake of dexamethasone by the liver, kidney and adrenal glands. Metabolism in the liver is slow and excretion is mainly in the urine, largely as unconjugated steroids. The plasma half-life is 3.0-4.5 hours but, as the effects significantly outlast plasma concentrations of steroids, the plasma half-life is of little relevance and the use of the biological half-life is more applicable. The biological half-life of dexamethasone is 36-54 hours. Therefore Dexamethasone is especially suitable in conditions where continuous glucocorticoid action is desirable.

In animal studies, cleft palate was observed. This was seen in rats, mice, hamsters, rabbits, dogs and primates. In some cases this was combined with defects to the central nervous system and the heart. In primates, effects to the brain were seen. Moreover, intra-uterine growth can be delayed. All these effects were seen at high dosages.

Propylene glycol.

Potato starch.

Magnesium stearate.

Lactose monohydrate.

None known

3 years

Store below 25°C. Store in the original package (to protect from light).

Polyethylene 'tampercontainer' tablet containers with child resistant closures, containing 100 or 500 tablets.

Not all pack sizes may be marketed.

No special requirements

Organon Ireland Limited

Drynam Road

Swords

Co. Dublin

PA 61/10/2

1^ST April 1978/29^th November 2007

Oct 2010