Myasthenia Gravis, antagonist to non-depolarizing neuromuscular blockade, Paralytic Ileus, Post-operative Urinary Retention; Paroxysmal Supraventricular Tachycardia.

Posology

Recommended doses are present by indication below but may be varied according to the individual needs of the patient.

Myasthenia Gravis

Antagonist to Non-depolarizing Neuromuscular Blockade

Reversal of Neuromuscular blockade with Neostigmine should not be attempted unless there is spontaneous recovery from paralysis.

Atropine and Neostigmine may be given simultaneously, but in patients with Bradycardia, the pulse rate should be increased to 80 per minute with Atropine before administering Neostigmine.

Other Indications

Paralytic ileus and post-operative urinary retention

Paroxysmal supraventricular tachycardia (via IV injection)

Treatment should be reserved for severe cases not responding to conventional treatment and under the close supervision of a specialist experienced with its use.

Use in special population groups

Paediatric population

A posology for use in the paediatric population is presented above by indication.

Use in the elderly

There are no specific dosage recommendations for Neostigmine Methylsulfate in the elderly (see section 4.4).

Method of Administration

Neostigmine Methylsulfate may be administered by IV, IM or SC injection. Please refer to the above text for the recommended route of administration according to indication.

Neostigmine Methylsulfate should be given slowly by the IV route (given over 1 minute).

A syringe of Atropine Sulfate should always be available to counteract severe cholinergic reactions should they occur.

Hypersensitivity to the active substance or to any of the excipients listed in section 6.1.

Neostigmine should not be administered to patients with mechanical obstruction of gastrointestinal or urinary tracts, peritonitis or doubtful bowel viability.

Neostigmine should not be used in conjunction with depolarising muscle relaxants such as suxamethonium as neuromuscular blockade may be potentiated.

Neostigmine should be used with extreme caution in patients with asthma as the parasympathomimetic action of neostigmine may cause bronchoconstriction.

Bradycardia, with the potential for progression to asystole, may occur in patients receiving neostigmine by intravenous injection unless atropine is given simultaneously. Extreme caution should be employed when treating patients with pre-existing bradycardia, cardiac arrhythmia or recent coronary occlusion.

Patients who are hyperreactive to neostigmine experience a severe cholinergic reaction to the drug. Atropine sulfate should always be available as an antagonist for the muscarinic effects of neostigmine.

Neostigmine should be used with caution in patients with epilepsy, vagotonia, hyperthyroidism, peptic ulceration or parkinsonism.

Administration of anticholinesterase agents to patients with intestinal anastomoses may produce rupture of the anastomosis or leakage of intestinal contents.

Elderly

Although there are no specific dosage requirements in the elderly, these patients may be more susceptible to dysrhythmias than younger patients.

Inhaled anaesthetics

Neostigmine Methylsulfate should not be given during cyclopropane or halothane anaesthesia; although it may be used after withdrawal of these agents.

Sodium content

This medicine contains 3.54 mg (or 0.15 mmol) sodium per each 1 ml ampoule (i.e. less than 1 mmol sodium (23 mg) per 1 ml ampoule), that is to say essentially 'sodium-free'.

Neuromuscular Blocking Agents

Neostigmine effectively antagonises the effect of Non-depolarizing muscle relaxants (e.g. Tubocurarine, Gallamine or Pancuronium) and this interaction is used to therapeutic advantage to reverse muscle relaxation after surgery. Neostigmine does not antagonise, and it may in fact prolong, the phase I block of depolarizing muscle relaxants such as Succinylcholine.

Other Drugs

Atropine antagonises the muscarinic effects of Neostigmine, the interaction is utilised to counteract the muscarinic symptoms of the Neostigmine toxicity.

Anticholinesterase agents are sometimes effective in reversing Neuromuscular Block induced by Aminoglycoside Antibiotics. However, Aminoglycoside Antibiotics and other drugs that interfere with Neuromuscular transmission should be used cautiously, if at all, in patients with Myasthenia Gravis and the dose of Neostigmine may have to be adjusted accordingly.

The use of Neostigmine Methylsulfate during pregnancy or lactation has not been established. Although the possible hazards to mother and child must be weighed against the potential benefits in every case. Experience with Myasthenia Gravis has revealed no untoward effect of the drug on the course of pregnancy. As the severity of Myasthenia Gravis often fluctuates considerably, particular care is required to avoid cholinergic crisis due to overdosage of Neostigmine.

Only negligible amounts of Neostigmine Methylsulfate are excreted in breast milk. Nevertheless, attention should be paid to possible effects on the breast-feeding infant.

Not applicable.

Adverse effects of Neostigmine are chiefly those of exaggerated response to parasympathetic stimulation.

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

Neostigmine Methylsulfate overdosage may include Cholinergic Crisis, which is characterised by nausea, vomiting, diarrhoea, excessive salivation and sweating, increased bronchial secretions, miosis, bradycardia or tachycardia, cardiospasm, bronchospasm, incoordination, muscle cramps, fasciculation and paralysis. Extremely high doses may produce CNS symptoms of agitation, fear or restlessness. Death may result from cardiac arrest or respiratory paralysis and pulmonary oedema. In patients with Myasthenia Gravis, in whom overdosage is most likely to occur, fasciculation and adverse parasympathomimetic effects may be mild or absent making cholinergic crisis difficult to distinguish from Myasthenia crisis.

Treatment

Maintenance of adequate respiration is of primary importance. Tracheostomy, Bronchial aspiration and postural drainage may be required; Respiration can be assisted mechanically or with oxygen, if necessary.

Neostigmine Methylsulfate should be discontinued immediately and 1 – 4mg of Atropine Sulfate administered IV. Additional doses of Atropine may be given every 5 – 30 minutes as needed to control muscarinic symptoms. Atropine overdosage should be avoided as tenacious secretions and bronchial plugs may result.

Neostigmine inhibits cholinesterase activity and prolongs and intensifies the muscarinic and nicotinic effects of acetylcholine. The anticholinesterase actions of Neostigmine are reversible. It is used mainly for its action on skeletal muscle and less frequently to increase the activity of smooth muscle. Neostigmine is used in the treatment of Myasthenia Gravis.

Neostigmine is a quaternary ammonium compound and is poorly absorbed from the gastrointestinal tract. Following parenteral administration as the methylsulfate, neostigmine is metabolised partly by hydrolysis of the ester linkage and is excreted in the urine both as unchanged drug and as metabolites. The half-life of neostigmine is only one to two hours.

No further information other than that which is included in the Summary of Product Characteristics.

Sodium chloride

Water for Injections

Neostigmine may be diluted with Water for Injections. Stability of the injection cannot be guaranteed once it has been diluted.

36 Months.

Protect from light and store at less than 25° C.

1ml glass ampoules hermetically sealed under flame at the gauging point. The ampoules are packed in cartons to contain 10 ampoules.

Use as directed by a physician.

If only part used discard the remaining solution.