Drug Interactions between Enlon-Plus and Urecholine

GENERALLY AVOID: Anticholinergic agents and other agents with significant anticholinergic activity (e.g., clozapine, class IA antiarrhythmics especially disopyramide) may antagonize the effects of cholinergic skeletal muscle stimulants (e.g., ambenonium, edrophonium, guanidine, neostigmine, pyridostigmine). Although this interaction may be desirable in some situations, such as when atropine is used to treat excessive muscarinic side effects and cholinergic crisis induced by anticholinesterase overdose, unintentional or indiscriminate use of anticholinergic agents in the treatment of myasthenia gravis may exacerbate symptoms. In addition, such use may mask the less serious, gastrointestinal signs of cholinergic overdose and lead to inadvertent induction of cholinergic crisis, which can produce respiratory paralysis and death.

MANAGEMENT: Agents with potent anticholinergic activity should preferably be avoided in patients receiving cholinergic skeletal muscle stimulants. If concurrent use is necessary, patients treated for myasthenia gravis should be monitored for potential exacerbation of symptoms. Caution is advised not only because anticholinergic agents may mask the signs of a cholinergic overdose, but also because increasing muscle weakness associated with disease aggravation may be difficult to distinguish from that due to cholinergic crisis.

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GENERALLY AVOID: Anticholinergic agents and other agents with significant anticholinergic activity (e.g., clozapine, class IA antiarrhythmics especially disopyramide) may antagonize the effects of direct-acting cholinergic agents such as bethanechol, carbachol, cevimeline, and pilocarpine. This interaction is sometimes desirable and is the basis for using atropine in the treatment of excessive muscarinic side effects and cholinergic crisis induced by cholinergic overdose. Conversely, cholinergic agents may also counteract the pharmacologic effects of anticholinergic agents and other agents that rely partially on their anticholinergic activity for therapeutic effects (e.g., some antiparkinsonian and antiemetic/antivertigo agents). The mechanism of interaction involves opposing pharmacodynamic action on muscarinic receptor sites.

MANAGEMENT: It may be appropriate to avoid concomitant use of anticholinergic agents and cholinergic agents, depending on the needs of the patient. If concurrent use is necessary, the patient should be monitored for reduced pharmacologic effects of both drugs.

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MONITOR: A synergistic effect may be expected when acetylcholinesterase inhibitors are administered concurrently with other cholinesterase inhibitors or cholinergic agonists.

MANAGEMENT: Monitoring for excessive cholinergic effects and seizure activity is recommended. Patients should be advised to notify their physician if they experience nausea, vomiting, diarrhea, abdominal pain, increased salivation, cold sweats, slow or irregular heartbeat, muscle weakness or cramps, dizziness, headache, seizures, or respiratory distress.

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