1.) Changes at Renewal; 2.) Update to SPC following Periodic Safety Update Report assesssment; 3.) Update to add information on clinical studies with vascular dementia patients and patients with Alzheimer's Dementia and concomitant cerebrovascular disease; 4.) Update to add information on switching to Reminyl XL from Reminyl.
2 QUALITATIVE AND QUANTITATIVE COMPOSITION
Each Reminyl XL 8 mg prolonged release capsule, hard contains galantamine8 mg galantamine (as hydrobromide, equivalent to 8 mg galantamine).
Each Reminyl XL 16 mg prolonged release capsule, hard contains galantamine16 mg galantamine (as hydrobromide, equivalent to 16 mg galantamine).
Each Reminyl XL 24 mg prolonged release capsule, hard contains galantamine24 mg galantamine (as hydrobromide, equivalent to 24 mg galantamine.).
Excipients:
8mg: sucrose 59 mg
16mg: sucrose 117 mg
24mg: sucrose 176 mg
For a full list of excipients, see section 6.1.
4.2 Posology and method of administration
Adults/elderlyElderly
Administration
Reminyl XL prolonged release capsules should be administered once- daily in the morning, preferably with food. The capsules should be swallowed whole together with some liquid. The capsules must not be chewed or crushed.
Ensure adequate fluid intake during treatment (see section 4.8).
Before start of treatment
The diagnosis of probable Alzheimer type of dementia should be adequately confirmed according to current clinical guidelines (see section 4.4).
Starting dose
The recommended starting dose is 8 mg/day for 4 weeks.
Maintenance dose
· The tolerance and dosing of Reminyl XLgalantamine should be reassessed on a regular basis, preferably within three months after start of treatment. Thereafter, the clinical benefit of Reminyl XLgalantamine and the patient’s tolerance of treatment should be reassessed on a regular basis according to current clinical guidelines. Maintenance treatment can be continued for as long as therapeutic benefit is favourable and the patient tolerates treatment with Reminyl XLgalantamine. Discontinuation of Reminyl XLgalantamine should be considered when evidence of a therapeutic effect is no longer present or if the patient does not tolerate treatment.
· The initial maintenance dose is 16 mg/day and patients should be maintained on 16 mg/day for at least 4 weeks.
· An increase to the maintenance dose of 24 mg/day should be considered on an individual basis after appropriate assessment including evaluation of clinical benefit and tolerability.
· In individual patients not showing an increased response or not tolerating 24 mg/day, a dose reduction to 16 mg/day should be considered.
· There is no rebound effect after abrupt discontinuation of treatment (e.g. in preparation for surgery).
Switching to Reminyl XL prolonged release capsules from Reminyl tablets or Reminyl oral solution
It is recommended that the same total daily dose of galantamine is administered to patients. Patients switching to the once-daily regimen should take their last dose of Reminyl tablets or oral solution in the evening and start Reminyl XL prolonged release capsules once daily the following morning.
Children
Reminyl XLGalantamine is not recommended for use in children due to a lack of data on safety and efficacy.
Hepatic and renal impairment
Galantamine plasma levels may be increased in patients with moderate to severe hepatic or renal impairment. In patients with moderately impaired hepatic function, based on pharmacokinetic modelling, it is recommended that dosing should begin with 8 mg prolonged release capsule once every other day, preferably taken in the morning, for one week. Thereafter, patients should proceed with 8 mg once- daily for four weeks. In these patients, daily doses should not exceed 16 mg. In patients with severe hepatic impairment (Child-Pugh score greater than 9), the use of Reminyl XLgalantamine is contraindicated (see section 4.3). No dosage adjustment is required for patients with mild hepatic impairment.
For patients with a creatinine clearance greater than 9 ml/min no dosage adjustment is required. In patients with severe renal impairment (creatinine clearance less than 9 ml/min), the use of Reminyl XLgalantamine is contraindicated (see section 4.3).
Concomitant treatment
In patients treated with potent CYP2D6 or CYP3A4 inhibitors, dose reductions can be considered (see section 4.5).
4.3 Contraindications
Reminyl XL should not be administeredHypersensitivity to patients with a known hypersensitivity to galantamine hydrobromidethe active substance or to any of the excipients.
Since no data are available on the use of Reminyl XL galantamine in patients with severe hepatic (Child-Pugh score greater than 9) and severe renal (creatinine clearance less than 9 ml/min) impairment, Reminyl XLgalantamine is contraindicated in these populations. Reminyl XLGalantamine is contraindicated in patients who have both significant renal and hepatic dysfunction.
4.4 Special warnings and special precautions for use
Reminyl XL is indicated for a patient with mild to moderately severe dementia of the Alzheimer type. The benefit of Reminyl XLgalantamine in patients with other types of dementia or other types of memory impairment has not been demonstrated. In 2 clinical trials of two years duration in individuals with so called mild cognitive impairment (milder types of memory impairment not fulfilling the criteria of Alzheimer dementia), Reminylgalantamine therapy failed to demonstrate any benefit either in slowing cognitive decline or reducing the clinical conversion to dementia. The mortality rate in the Reminylgalantamine group was significantly higher than in the placebo group, 14/1026 (1.4%) patients on Reminylgalantamine and 3 /1022 (0.3%) patients on placebo. The deaths were due to various causes. About half of the Reminylgalantamine deaths appeared to result from various vascular causes (myocardial infarction, stroke, and sudden death). The relevance of this finding for the treatment of patients with Alzheimer dementia is unknown. In Alzheimer dementia, placebo-controlled studies of only 6 months duration have been conducted. In these studies no increased mortality in the Reminylgalantamine groups appeared.
A diagnosis of Alzheimer’s dementia should be made according to current guidelines by an experienced physician. Therapy with Reminyl XLgalantamine should occur under the supervision of a physician and should only be initiated if a caregiver is available who will regularly monitor medicinal product intake by the patient.
Patients with Alzheimer’s disease lose weight. Treatment with cholinomimeticscholinesterase inhibitors, including Reminyl XLgalantamine, has been associated with weight loss in these patients. During therapy, patient’s weight should be monitored.
As with other cholinomimetics, Reminyl XLgalantamine should be given with caution in the following conditions:
Cardiovascular conditions
Cardiac disorders
Because of their pharmacological action, cholinomimetics may have vagotonic effects on heart rate (e.g. bradycardia). The potential for this action may be particularly important to patients with “‘sick sinus syndrome”’ or other supraventricular cardiac conduction disturbances or in those who use medicinal products that significantly reduce heart rate concomitantly, such as digoxin and beta blockers or for patients with an uncorrected electrolyte disturbance (e.g. hyperkalaemia, hypokalaemia).
Caution should therefore be exercised when administering Reminyl XLgalantamine to patients with cardiovascular diseases, e.g. immediate post-myocardial infarction period, new-onset atrial fibrillation, second degree heart block or greater, unstable angina pectoris, or congestive heart failure, especially NYHA group III – IV.
In a pooled analysis of placebo-controlled studies in patients with Alzheimer dementia treated with Reminylgalantamine an increased incidence of certain cardiovascular adverse events were observed (see section 4.8 Undesirable effects).
Gastrointestinal conditions
disorders
Patients at increased risk of developing peptic ulcers, e.g. those with a history of ulcer disease or those predisposed to these conditions, including those receiving concurrent non-steroidal anti-inflammatory drugs (NSAIDs), should be monitored for symptoms. The use of Reminyl XLgalantamine is not recommended in patients with gastrointestinal obstruction or recovering from gastrointestinal surgery.
Neurological conditions
Cholinomimetics Nervous system disorders
Although cholinomimetics are believed to have some potential to cause generalised convulsions. Howeverseizures, seizure activity may also be a manifestation of Alzheimer’s disease. In clinical trials there was no increase in incidence of convulsions with Reminyl XL compared with placebo. In rare cases an increase in cholinergic tone may worsen Parkinsonian symptoms.
In a pooled analysis of placebo-controlled studies in patients with Alzheimer’s dementia treated with Reminyl,galantamine cerebrovascular events were uncommonly observed (see section 4.8 Undesirable effects). This should be considered when administering Reminyl XLgalantamine to patients with cerebrovascular disease.
Pulmonary conditions
Respiratory, thoracic and mediastinal disorders
Cholinomimetics should be prescribed with care for patients with a history of severe asthma or obstructive pulmonary disease or active pulmonary infections (e.g. pneumonia).
Genitourinary
Renal and urinary disorders
The use of Reminyl XLgalantamine is not recommended in patients with urinary outflow obstruction or recovering from bladder surgery.
Anaesthesia
Reminyl XLSurgical and medical procedures
Galantamine, as a cholinomimetic is likely to exaggerate succinylcholine-type muscle relaxation during anaesthesia, especially in cases of pseudocholinesterase deficiency.
Other
Reminyl XL prolonged release capsules contain sucrose. Patients with rare hereditary problems of fructose intolerance, glucose-galactose malabsorption or sucrase-isomaltase insufficiency should not take this medicine.
Interaction
4.5 Interactions with other medicinalMedicinal products and other forms of interactions
Pharmacodynamic interactions
Because of its mechanism of action, galantamine should not be given concomitantly with other cholinomimetics (such as ambenonium, donepezil, neostigmine, pyridostigmine, rivastigmine or systemically administered pilocarpine). Galantamine has the potential to antagonise the effect of anticholinergic medication. Should anticholinergic medication such as atropine be abruptly stopped there is a potential risk that galantamine’s effect could be exacerbated. As expected with cholinomimetics, a pharmacodynamic interaction is possible with medicinal products that significantly reduce the heart rate such as digoxin, beta-blockers, certain calcium-channel blocking agents and amiodarone. Caution should be taken with medicinal products that have potential to cause torsades de pointes. In such cases an ECG should be considered.
Galantamine, as a cholinomimetic, is likely to exaggerate succinylcholine-type muscle relaxation during anaesthesia, especially in cases of pseudocholinesterase deficiency.
Pharmacokinetic interactions
Multiple metabolic pathways and renal excretion are involved in the elimination of galantamine. The possibility of clinically relevant interactions is low. However, the occurrence of significant interactions may be clinically relevant in individual cases.
Concomitant administration with food slows the absorption rate of galantamine but does not affect the extent of absorption. It is recommended that Reminyl XL be taken with food in order to minimise cholinergic side effects.
Other medicinal products affecting the metabolism of galantamine
Formal drug interaction studies showed an increase in galantamine bioavailability of about 40% during co-administration of paroxetine (a potent CYP2D6 inhibitor) and of 30% and 12% during co-treatment with ketoconazole and erythromycin (both CYP3A4 inhibitors). Therefore, during initiation of treatment with potent inhibitors of CYP2D6 (e.g. quinidine, paroxetine or fluoxetine) or CYP3A4 (e.g. ketoconazole or ritonavir) patients may experience an increased incidence of cholinergic adverse reactions, predominantly nausea and vomiting. Under these circumstances, based on tolerability, a reduction of the Reminyl XL galantamine maintenance dose can be considered (see section 4.2).
Memantine, an N-methyl-D-aspartate (NMDA) receptor antagonist, at a dose of 10 mg once a day for 2 days followed by 10 mg twice a day for 12 days, had no effect on the pharmacokinetics of galantamine (as Reminyl XL prolonged-release capsules 16 mg once a day) at steady state.
Effect of galantamine on the metabolism of other medicinal products
Therapeutic doses of Reminyl XLgalantamine 24 mg/day had no effect on the kinetics of digoxin, although pharmacodynamic interactions may occur (see also pharmacodynamic interactions).
Therapeutic doses of Reminyl XLgalantamine 24 mg/day had no effect on the kinetics and prothrombin time of warfarin.
4.6 Pregnancy and lactation
Pregnancy
For Reminyl XLgalantamine no clinical data on exposed pregnancies are available. Animal studies indicate a slightly delayed developmentStudies in foetuses and neonatesanimals have shown reproductive toxicity (see section 5.3). Caution should be exercised when prescribing to pregnant women.
Lactation
It is not known whether galantamine is excreted in human breast milk and there are no studies in lactating women. Therefore, women on Reminyl XLgalantamine should not breast-feed.
4.7 Effects on ability to drive and use machines
Reminyl XL may cause dizziness and somnolence, which could affect the ability to drive Galantamine has minor or moderate influence on the ability to drive and use machines. Symptoms include dizziness and somnolence, especially during the first weeks after initiation of treatment.
4.8 Undesirable effects
The most common adverse events observed in clinical trials (incidence ³ 5% and twice the frequency of placebo) were nausea, vomiting, diarrhoea, abdominal pain, dyspepsia, anorexia, fatigue, dizziness, headache, somnolence and weight decrease. Nausea, vomiting and anorexia were more commonly observed in women.
Other common adverse events observed in clinical trials (incidence ³ 5% and ³ placebo) were confusion, depression, fall, injury, insomnia, rhinitis and urinary tract infection.
In a randomised, double-blind, placebo controlled, clinical trial, adverse events that occurred with once-daily treatment with Reminyl XL prolonged release capsules were similar in frequency and nature to those seen with Reminyl tablets.
The majority of these adverse events occurred during the titration period. Nausea and vomiting, the most frequent adverse events, lasted less than a week in most cases and the majority of patients had only one episode. Prescription of anti-emetics and ensuring adequate fluid intake may be useful in these instances.
Adverse Events Observed During Clinical Trials and Post Marketing Experience.
Adverse events observed during clinical trials and post marketing experience.
|
System Organ Class
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Very Common
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Common
|
Uncommon
|
Rare
|
Very Rare
|
|
Infections and infestations
|
|
Rhinitis Urinary tract infections
|
|
|
|
|
Metabolism and nutrition disorders
|
|
Anorexia
Weight decrease
|
|
Dehydration (leading to renal insufficiency and renal failure) Hypokalaemia
|
|
|
Psychiatric disorders
|
|
Confusion
Depression
(very rarely with suicidality) Insomnia
|
|
Aggression
Agitation
Hallucinations
|
|
|
Nervous system disorders
|
|
Dizziness
Somnolence
Syncope
Tremor
|
Paraesthesia
|
Seizures
|
Worsening of Parkinsonism
|
|
Ear and labyrinth disorders
|
|
|
Tinnitus
|
|
|
|
Cardiac disorders
|
|
|
Atrial arrhythmia
Myocardial infarction
Myocardial ischaemia
Palpitation
|
Bradycardia
(severe)
|
AV block
|
|
Vascular disorders
|
|
Hypertension
|
Cerebrovascular disease
Transient ischaemic attack
|
|
Hypotension
|
|
Gastrointestinal disorders
|
Vomiting Nausea
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Abdominal pain
Diarrhoea
Dyspepsia
|
|
|
Dysphagia Gastrointestinal bleeding
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|
Skin and subcutaneous tissueHepatobiliary disorders
|
|
|
|
Rash
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Increased sweatingElevated liver enzymes
Hepatitis
|
|
Skin and subcutaneous tissue disorders
|
|
|
|
Rash
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Increased sweating
|
|
Musculoskeletal and connective tissue disorders
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|
|
Leg Cramps
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|
|
|
General disorders and administration site conditions
|
|
Asthenia
Fatigue
Fever
Headache
Malaise
|
|
|
|
|
Injury, poisoning and procedural complications
|
|
Fall
Injury
|
|
|
|
Frequencies are defined as: very common ( >(³1/10), common ( >(³ 1/100, to < 1/10), uncommon ( >(³ 1/1,000, to < 1/100), rare ( >(³1/10,000, to <1/1,000) and very rare (<1/10,000).
Some of these adverse events may be attributable to cholinomimetic properties of galantamine or in some cases may represent manifestations or exacerbations of the underlying disease processes common in the elderly population.
4.9 Overdose
Symptoms
Signs and symptoms of significant overdosing of Reminyl XLgalantamine are predicted to be similar to those of overdosing of other cholinomimetics. These effects generally involve the central nervous system, the parasympathetic nervous system, and the neuromuscular junction. In addition to muscle weakness or fasciculations, some or all of the signs of a cholinergic crisis may develop: severe nausea, vomiting, gastrointestinal cramping, salivation, lacrimation, urination, defecation, sweating, bradycardia, hypotension, collapse and convulsions. Increasing muscle weakness together with tracheal hypersecretions and bronchospasm, may lead to vital airway compromise.
In aThere have been post-marketing report, bradycardia, s of torsade de pointes, QT prolongation, bradycardia, ventricular tachycardia and torsade de pointes accompanied by a brief loss of consciousness were reported in association with an inadvertent ingestion of overdoses of galantamine. In one case where the dose was known, eight Reminyl 4 mg tablets (32 mg total) were ingested on a single day.
Two additional cases of accidental ingestion of 32 mg (nausea, vomiting, and dry mouth; nausea, vomiting, and substernal chest pain) and one of 40 mg (vomiting) resulted in brief hospitalisations for observation with full recovery. One patient, who was prescribed 24 mg/day and had a history of hallucinations over the previous two years, mistakenly received 24 mg twice daily for 34 days and developed hallucinations requiring hospitalisation. Another patient, who was prescribed 16 mg/day of oral solution, inadvertently ingested 160 mg (40 ml) and experienced sweating, vomiting, bradycardia, and near-syncope one hour later, which necessitated hospital treatment. His symptoms resolved within 24 hours.
Treatment
As in any case of overdose, general supportive measures should be used. In severe cases, anticholinergics such as atropine can be used as a general antidote for cholinomimetics. An initial dose of 0.5 to 1.0 mg i.v. is recommended, with subsequent doses based on the clinical response.
Because strategies for the management of overdose are continually evolving, it is advisable to contact a poison control centre to determine the latest recommendations for the management of an overdose.
5 PHARMACOLOGICAL PROPERTIES
5.1 Pharmacodynamic properties
Pharmacotherapeutic group: Antidementia drugs
ATC-code: N06DA04.
Galantamine, a tertiary alkaloid is a selective, competitive and reversible inhibitor of acetylcholinesterase. In addition, galantamine enhances the intrinsic action of acetylcholine on nicotinic receptors, probably through binding to an allosteric site of the receptor. As a consequence, an increased activity in the cholinergic system associated with improved cognitive function can be achieved in patients with dementia of the Alzheimer type.
Clinical studies
Reminyl XL was originally developed in the form of immediate -release tablets (Reminyl) for twice-daily administration. The dosages of Reminylgalantamine effective in these placebo-controlled clinical trials with a duration of 5 to 6 months were 16, 24 and 32 mg/day. Of these doses 16 and 24 mg/day were judgeddetermined to have the best benefit/risk relationship and were retained as are the recommended maintenance doses. Reminyl’sThe efficacy of galantamine has been shown using outcome measures which evaluate the three major symptom complexes of the disease and a global scale: the ADAS-cog/11 (a performance based measure of cognition), DAD and ADCS-ADL-Inventory (measurements of basic and instrumental Activities of Daily Living), the Neuropsychiatric Inventory (a scale that measures behavioural disturbances) and the CIBIC-plus (a global assessment by an independent physician based on a clinical interview with the patient and caregiver).
Composite Responder Analysis Based on at Least 4 Points Improvement in ADAS-cog/11 Compared to Baseline and CIBIC-plus Unchanged + Improved (1-4), and DAD/ADL Score Unchanged + Improved. See Table Belowbelow.
|
At least 4 points improvement from baseline in ADAS-cog/11 and CIBIC-plus Unchanged + Improved
|
|
Treatment
|
Change in DAD ³ 0
GAL-USA-1 and GAL-INT-1 (Month 6)
|
Change in ADCS/ADL-Inventory ³ 0
GAL-USA-10 (Month 5)
|
|
Nn
|
n (%) of responder
|
Comparison
with placebo
|
n
|
n (%) of responder
|
Comparison
with placebo
|
|
Diff (95%CI)
|
p-value†
|
Diff (95%CI)
|
p-value†
|
|
Classical ITT#
|
|
Placebo
|
422
|
21 (5.0)
|
-–
|
-–
|
273
|
18 ( 6.6)
|
-–
|
-–
|
|
Gal 16 mg/day
|
-–
|
-–
|
-–
|
-–
|
266
|
39 (14.7)
|
8.1 (3, 13)
|
0.003
|
|
Gal 24 mg/day
|
424
|
60 (14.2)
|
9.2 (5, 13)
|
<0.001
|
262
|
40 (15.3)
|
8.7 (3, 14)
|
0.002
|
|
Trad.itional LOCF*
|
|
Placebo
|
412
|
23 (5.6)
|
-–
|
-–
|
261
|
17 (6.5)
|
-–
|
-–
|
|
Gal 16 mg/day
|
-–
|
-–
|
-–
|
-–
|
253
|
36 (14.2)
|
7.7 (2, 13)
|
0.005
|
|
Gal 24 mg/day
|
399
|
58 (14.5)
|
8.9 (5, 13)
|
<0.001
|
253
|
40 (15.8)
|
9.3 (4, 15)
|
0.001
|
|
# ITT: Intent To Treat
† CMH test of difference from placebo.
* LOCF: Last Observation Carried Forward.
|
The efficacy of Reminyl XL prolonged release capsules was studied in a randomised, double-blind, placebo-controlled trial, GAL-INT-10, using a 4-week dose escalation, flexible dosing regimen of 16 or 24 mg/day for a treatment duration of 6 months. Reminyl immediate -release tablets (Gal-IR) were added as a positive control arm. Efficacy was evaluated using the ADAS-cog/11 and the CIBIC-plus scores as co-primary efficacy criteria, and ADCS-ADL and NPI scores as secondary end-points. Reminyl XL prolonged release capsules (Gal-PR) demonstrated statistically significant improvements in the ADAS-cog/11 score compared to placebo, but were not statistically different in the CIBIC-plus score compared to placebo. The results of the ADCS-ADL score were statistically significantly better compared to placebo at week 26.
Composite Responder Analysis at Week 26 Based on at Least 4 Points Improvement from Baseline in ADAS-cog/11, Total ADL Score Unchanged + Improved (³0) and No Worsening in CIBIC-plus Score (1-4). See Table Belowbelow.
|
GAL-INT-10
|
Placebo
|
Gal-IR†
|
Gal-PR*
|
p-value
(Gal-PR* vs. Placebo)
|
|
|
(n = 245)
|
(n = 225)
|
(n = 238)
|
|
|
Composite Response: n (%)
|
20 (8.2)
|
43 (19.1)
|
38 (16.0)
|
0.008
|
|
† Immediate release tablets
* Prolonged release capsules
|
The results of a 26-week double-blind placebo-controlled trial, in which patients with vascular dementia and patients with Alzheimer’s disease and concomitant cerebrovascular disease (“mixed dementia”) were included, indicate that the symptomatic effect of galantamine is maintained in patients with Alzheimer’s disease and concomitant cerebrovascular disease (see section 4.4, Nervous system disorders). In a post-hoc subgroup analysis, no statistically significant effect was observed in the subgroup of patients with vascular dementia alone.
In a second 26-week placebo-controlled trial in patients with probable vascular dementia, no clinical benefit of galantamine treatment was demonstrated.
5.2 Pharmacokinetic properties
Galantamine is an alkalinic compound with one ionisation constant (pKa 8.2). It is slightly lipophilic and has a partition coefficient (Log P) between n-octanol/buffer solution (pH 12) of 1.09. The solubility in water (pH 6) is 31 mg/ml. Galantamine has three chiral centres. The S, R, S-form is the naturally occurring form. Galantamine is partially metabolised by various cytochromes, mainly CYP2D6 and CYP3A4. Some of the metabolites formed during the degradation of galantamine have been shown to be active in vitro but are of no importance in vivo.
General characteristics of galantamine
Absorption
The absolute bioavailability of galantamine is high, 88.5 ± 5.4%. Reminyl XL prolonged release capsules are bioequivalent to the twice-daily immediate -release tablets with respect to AUC24h and Cmin. The Cmax value is reached after 4.4 hours and is about 24% lower than that of the tablet. Food has no significant effect on AUC of the prolonged release capsules. Cmax was increased by about 12% and Tmax increased by about 30 minutes when the capsule was given after food. However, these changes are unlikely to be clinically significant.
Distribution
The mean volume of distribution is 175 l. Plasma protein binding is low, 18%.
Metabolism
Up to 75% of galantamine dosed is eliminated via metabolism. In vitro studies indicate that CYP2D6 is involved in the formation of O-desmethylgalantamine and CYP3A4 is involved in the formation of N-oxide-galantamine. The levels of excretion of total radioactivity in urine and faeces were not different between poor and extensive CYP2D6 metabolisers. In plasma from poor and extensive metabolisers, unchanged galantamine and its glucuronide accounted for most of the sample radioactivity. None of the active metabolites of galantamine (norgalantamine, O-desmethylgalantamine and O-desmethyl-norgalantamine) could be detected in their unconjugated form in plasma from poor and extensive metabolisers after single dosing. Norgalantamine was detectable in plasma from patients after multiple dosing, but did not represent more than 10% of the galantamine levels. In vitro studies indicated that the inhibition potential of galantamine with respect to the major forms of human cytochrome P450 is very low.
Elimination
Galantamine plasma concentration declines bi-exponentially, with a terminal half-life around 8-10 hours in healthy subjects. Typical oral clearance in the target population is about 200 ml/min with intersubject variability of 30% as derived from the population analysis of immediate -release tablets. Seven days after a single oral dose of 4 mg ³H-galantamine, 90-97% of the radioactivity is recovered in urine and 2.2-6.3% in faeces. After i.v. infusion and oral administration, 18-22% of the dose was excreted as unchanged galantamine in the urine in 24 hours, with a renal clearance of 68.4 ± 22.0 ml/min, which represents 20-25% of the total plasma clearance.
Dose-linearity
Galantamine pharmacokinetics of Reminyl XL prolonged release capsules are dose proportional within the studied dose range of 8 mg to 24 mg once-daily in elderly and young age groups.
Characteristics in patients
Data from clinical trials in patients indicate that the plasma concentrations of galantamine in patients with Alzheimer’s disease are 30% to 40% higher than in healthy young subjects primarily due to the advanced age and reduced kidney function. Based upon the population pharmacokinetic analysis, clearance in female subjects is 20% lower as compared to males. The galantamine clearance in poor metabolisers of CYP2D6 is about 25% lower than in extensive metabolisers, but no bimodality in the population is observed. Therefore, the metabolic status of the patient is not considered to be of clinical relevance in the overall population.
The pharmacokinetics of galantamine in subjects with mild hepatic impairment (Child-Pugh score of 5 to 6) were comparable to those in healthy subjects. In patients with moderate hepatic impairment (Child-Pugh score of 7 to 9), AUC and half-life of galantamine were increased by about 30% (see section 4.2).
Elimination of galantamine decreases with decreasing creatinine clearance as observed in a study with renally impaired subjects. Compared to Alzheimer patients, peak and trough plasma concentrations are not increased in patients with a creatinine clearance of ³ 9 ml/min. Therefore, no increase in adverse events is expected and no dosage adjustments are needed (see section 4.2).
Pharmacokinetic/pharmacodynamic relationship
No apparent correlation between average plasma concentrations and efficacy parameters (i.e. change in ADAS-cog/11 and CIBIC-plus at month 6) were observed in the large Phase III trials with a dose-regimen of 12 and 16 mg twice-daily.
Plasma concentrations in patients experiencing syncope were within the same range as in the other patients at the same dose.
The occurrence of nausea is shown to correlate with higher peak plasma concentrations (see section 4.5).
5.3 Preclinical safety data
PreNon-clinical data revealsuggest no special hazard for humans other than those expected from the pharmacodynamic effect of galantamine. This assumption is based on conventional studies of safety pharmacology, repeated dose toxicity, genotoxicity and carcinogenic potential.
Reproduction toxicity studies showed a slight delay in development in rats and rabbits, at doses that are below the threshold of toxicity in the pregnant females.
6 PHARMACEUTICAL PARTICULARS
6.1 List of excipients
Prolonged release pellets
Diethyl phthalate
Ethylcellulose
Hypromellose
Macrogol 400
Maize starch
Sucrose
Capsules
Gelatin
Titanium dioxide (E171)
The 16 mg capsule also contains red ferric oxide (E172).
The 24 mg capsule also contains red ferric oxide (E172) and yellow ferric oxide (E172).
Imprinting ink
Benzoic acid (E210)
Black ferric oxide (E172)
Dimethyl siloxanes
Glycerides
Lecithin (soya) (E322)
Methylcellulose
Polyethylene glycol
Polyethylene glycolMacrogol
Macrogol stearate
Shellac
Sorbic acid
XanthumXanthan gum
6.3 Shelf -life
2 years.
6.4 Special precautionsPrecautions for storageStorage
Do not store above 30ºC.
6.5 Nature and contentsContent of containerContainer
Available pack sizes:
8mg
28 prolonged release capsules, hard (PVC-PE-PVDC/Aluminium blister)
16mg
28 prolonged release capsules, hard (PVC-PE-PVDC/Aluminium blister)
24mg
28 prolonged release capsules, hard (PVC-PE-PVDC/Aluminium blister)
Instructions
6.6 Special precautions for usedisposal and other handling
No special requirements.
9 DATE OF FIRST AUTHORISATION / RENEWAL OF THE AUTHORISATION
Date of first authorisation: 06 January 2005
Date of last renewal: 01 March 2005
10 DATE OF REVISION OF THE TEXT
July 2005
January 2008
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