- alimemazine tartrate
POM: Prescription only medicine
This information is intended for use by health professionals
Alimemazine tartrate 10mg fim-coated tablets
Each film-coated tablet contains 10mg of alimemazine tartrate.
Excipients with Known effect: Lactose 34 mg/tab
For a full list of excipients, see section 6.1.
Dark blue, circular, biconvex and film coated tablet. One side of tablet is marked with AL and other side is plain.
Alimemazine has powerful antihistamine and anti-emetic actions and is used in the management of urticaria and pruritus.
Alimemazine may be used in pre-medication as a sedative before anaesthesia in children aged between 2 to 7 years. The alimemazine syrup formulation is suitable for these indications in children.
Do NOT exceed the recommended dose (see also section 4.9).
Urticaria and pruritus
Adults: 10mg two or three times daily.
Elderly: Dosage should be reduced to 10mg once or twice daily.
Not recommended for infants less than 2 years old.
Children over 2 years of age: The use of Alimemazine Syrup is recommended.
As a sedative before anaesthesia
The dosage for children is best achieved by use of Alimemazine Syrup.
Method of administration
Hypersensitivity to the active substance, phenothiazines or to any of the excipients listed in section 6.1.
Use in patients with hepatic or renal dysfunction, epilepsy, Parkinson's disease, hypothyroidism, phaeochromocytoma, myasthenia gravis, and prostatic hypertrophy.
Use in patients with history of narrow angle glaucoma and agranulocytosis.
Use in children less than 2 years of age (see Section 4.4).
Precautions for use:
Alimemazine should be used with caution in:
- Elderly or volume depleted patients who are more susceptible to orthostatic hypotension (see section 4.8)
- Elderly patients presenting chronic constipation (risk of paralytic ileus),
- Elderly patients with possible prostatic hypertrophy (see section 4.3);
- Elderly patients in hot and cold weather (risk of hyper/hypothermia) (see section 4.8)
- Patients with certain cardiovascular diseases alimemazine may cause arrhythmias due to the tachycardia-inducing and hypotensive effects of phenothiazines (see section 4.8)
- Patients with seizures (see section 4.8).
Alimemazine is contraindicated for use in children less than 2 years of age due to the risk of marked sedation and respiratory depression.
Patients are strongly advised not to consume alcoholic beverages or medicines containing alcohol throughout treatment (see section 4.5).
Exposure to sunlight should be avoided during treatment (see section 4.8).
There is a risk of post-operative restlessness especially if the child is in pain.
Tablets contains lactose:
Patients with rare hereditary problems of galactose intolerance, total lactase
deficiency or glucose-galactose malabsorption should not take this medicine.
This medicine contains less than 1 mmol sodium (23 mg) per dose, that is to say essentially 'sodium-free'.
The sedative effects of phenothiazines may be intensified (additively) by alcohol (see section 4.4), anxiolytics & hypnotics, opiates, barbiturates and other sedatives. There may be increased antimuscarinic and sedative effects of phenothiazines with tricyclic antidepressants & MAOI's (including moclobemide). Respiratory depression may occur.
The hypotensive effect of most antihypertensive drugs especially alpha adrenoreceptor blocking agents may be exaggerated by phenothiazines. The use of antimuscarinics will increase the risk of antimuscarinic side effects when in conjunction with antihistamines.
The mild anticholinergic effect of phenothiazines may be enhanced by other anticholinergic drugs possibly leading to constipation, heat stroke, etc.
The action of some drugs may be opposed by phenothiazines; these include amphetamine, levodopa, clonidine, guanethidine, and adrenaline.
Anticholinergic agents may reduce the antipsychotic effect of phenothiazines.
Some drugs interfere with absorption of phenothiazines: antacids, anti-Parkinson, and lithium. Increases or decreases in the plasma concentrations of a number of drugs, e.g. propranolol and phenobarbital have been observed but were not of clinical significance.
High doses of phenothiazines reduce the response to hypoglycaemic agents, the dosage of which may have to be raised. Adrenaline must not be used in patients overdosed with phenothiazines.
As with other neuroleptic phenothiazines, caution is advised with concomitant use of QT prolonging drugs or drugs that cause electrolyte imbalance.
There is inadequate evidence of the safety of Alimemazine in human pregnancy, but it has been widely used for many years without apparent ill consequence. Some phenothiazines have shown evidence of harmful effects in animals. Alimemazine, like other drugs, should be avoided in pregnancy unless the physician considers it essential. Neuroleptics may occasionally prolong labour and at such a time should be withheld until the cervix is dilated 3-4cm. Possible adverse effects on the neonate include lethargy or paradoxical hyper excitability, tremor and low Apgar score.
Phenothiazines may be excreted in milk: breast feeding should be suspended during treatment.
Patients should be warned about drowsiness during the early days of treatment, and advised not to drive or operate machinery.
The following adverse reactions are classified by system organ class and ranked under heading of frequency using the following convention:
Not known (cannot be estimated from the available data).
Blood and lymphatic system disorders:
• A mild leukopenia occurs in up to 30% of patients on prolonged high dosage.
• Agranulocytosis may occur rarely; it is not dose related.
The occurrence of unexplained infections or fever requires immediate haematological investigation.
Nervous system disorders:
• Drowsiness or sedation, more marked at the start of treatment.
• Convulsions have been reported in some patients.
• Extrapyramidal: Acute dystonias or dyskinesias, usually transitory are commoner in children and young adults and usually occur within the first 4 days of treatment or after dosage increases.
- Akathisia characteristically occurs after large doses.
- Parkinsonism is commoner in adults and the elderly. It usually develops after weeks or months of treatment. One or more of the following may be seen: tremor, rigidity, akinesia or other features of Parkinsonism. Commonly just tremor.
- Tardive dyskinesia: If this occurs it is usually, but not necessarily, after prolonged or high dosage. It can even occur after treatment has been stopped. Dosage should therefore be kept low whenever possible.
• Accommodation disorders
Cardiac arrhythmias, including atrial arrhythmia: A-V block, ventricular tachycardia and fibrillation have been reported during therapy, possibly related to dosage. Pre-existing cardiac disease, old age, hypokalaemia and concurrent tricyclic antidepressants may predispose.
• Hypotension, or pallor may occur in children.
• Elderly or volume depleted subjects are particularly susceptible to postural hypotension (see section 4.4).
Respiratory, thoracic and mediastinal disorders:
• Nasal stuffiness
• Respiratory depression is possible in susceptible patients.
• Dry mouth
Jaundice, usually transient, occurs in a very small percentage of patients. A premonitory sign may be a sudden onset of fever after one to three weeks of treatment followed by the development of jaundice. Neuroleptic jaundice has the biochemical and other characteristics of obstructive jaundice and is associated with obstructions of the canaliculi by bile thrombi; the frequent presence of an accompanying eosinophilia indicates the allergic nature of this phenomenon. Treatment should be withheld on the development of jaundice.
Skin and subcutaneous tissue disorders:
• Contact skin sensitisation is a serious but rare complication in those frequently handling preparations of phenothiazines: Care must be taken to avoid contact of the drug with the skin.
• Skin rashes of various kinds may also be seen in patients treated with the drug.
• Patients on high dosage may develop photosensitivity in sunny weather and should avoid exposure to direct sunlight (see section 4.4). Ocular changes and the development of a metallic greyish-mauve colouration of exposed skin have been noted in some individuals, mainly females, who have received chlorpromazine continuously for long periods (four to eight years).
Renal and urinary disorders:
• Urinary retention
• Hyperprolactinaemia which may result in galactorrhoea, gynaecomastia, amenorrhoea and impotence.
• Neuroleptic malignant syndrome (hyperthermia, rigidity, autonomic dysfunction and altered consciousness) may occur.
General disorders and administration site conditions:
• Paradoxical excitement has been noted.
ECG changes, usually benign, including:
• Widened QT interval, ST segment depression, U-waves and T-wave changes.
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.
Symptoms of phenothiazine overdosage include drowsiness or loss of consciousness, hypotension, tachycardia, ECG changes, ventricular arrhythmias and hypothermia. Severe extra-pyramidal dyskinesias may occur.
If the patient is seen sufficiently soon (up to 6 hours) after ingestion of a toxic dose, gastric lavage may be attempted. Pharmacological induction of emesis is unlikely to be of any use. Activated charcoal should be given. There is no specific antidote. Treatment is supportive.
Generalised vasodilatation may result in circulatory collapse; Raising the patient's legs may suffice, in severe cases, volume expansion by intravenous fluids may be needed; infusion fluids should be warmed before administration in order not to aggravate hypothermia.
Positive inotropic agents such as dopamine may be tried if fluid replacement is insufficient to correct the circulatory collapse. Peripheral vasoconstrictor agents are not generally recommended; avoid the use of adrenaline.
Ventricular or supraventricular tachy-arrhythmias usually respond to restoration of normal body temperature and correction of circulatory or metabolic disturbances. If persistent or life-threatening, appropriate anti-arrhythmic therapy may be considered. Avoid lidocaine and, as far as possible, long acting anti-arrhythmic drugs.
Pronounced central nervous system depression requires airway maintenance or, in extreme circumstances, assisted respiration. Severe dystonic reactions, usually respond to procyclidine (5-10mg) or orphenadrine (20-40mg) administered intramuscularly or intravenously. Convulsions should be treated with intravenous diazepam.
Neuroleptic malignant syndrome (NMS) has been reported in the context of alimemazine overdose. Symptoms of NMS include a combination of hyperthermia, muscle rigidity, altered mental status and autonomic instability. Since this syndrome is potentially fatal, alimemazine must be discontinued immediately, and intensive clinical monitoring and symptomatic treatment must be initiated.
Strict adherence to the recommended dose is critical (see also section 4.2)
Neuroleptic malignant syndrome should be treated with cooling. Dantrolene sodium may be tried.
ATC Code: R06A D01
Pharmacotherapeutic group: Phenothiazine derivatives
Alimemazine has a central sedative effect, comparable to that of chlorpromazine, but largely devoid of the latter's anti-adrenaline action. It has powerful antihistamine and anti-emetic actions.
There is little information about blood levels, distribution and excretion in humans. The rate of metabolism and excretion of phenothiazines decreases in old age.
There are no pre-clinical data of relevance to the prescriber which are additional to that already included in other sections of the SPC.
Sodium Starch Glycolate
Silica, Colloidal anhydrous
Opaspray Blue Liquid M-1-4229
Do not store above 30°C. Store in the original package in order to protect from light.
Tablets are packed in blisters containing 28 tablets.
No special requirements.
Mercury Pharmaceuticals Ltd,
85 King William Street,
London EC4N 7BL
Capital House, 1st Floor, 85 King William Street, London, EC4N 7BL, UK
+44 (0)208 588 9131
08700 70 30 33
+44 (0)208 588 9273