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Adverse effects of anticholinesterase agents such as MYTELASE (ambenoium chloride) usually result from overdosage and include muscarinic effects such as excessive salivation, abdominal cramps, diarrhea, miosis, urinary urgency, sweating, nausea, increase in bronchial and lacrymal secretions, and vomiting, and nicotinic effects such as muscle cramps, fasciculation of voluntary muscles, and rarely generalized malaise with anxiety and vertigo. (See OVERDOSAGE.)