<p>Overdosage with antimuscarinic agents, including Trospium, can result in severe antimuscarinic effects. Supportive treatment should be provided according to symptoms. In the event of overdosage, electrocardiographic monitoring is recommended. A 7-month-old baby experienced tachycardia and mydriasis after administration of a single dose of trospium 10 mg given by a sibling. The baby&rsquo;s weight was reported as 5 kg. Following admission into the hospital and about 1 hour after ingestion of the trospium, medicinal charcoal was administered for detoxification. While hospitalized, the baby&nbsp; experienced mydriasis and tachycardia up to 230 beats per minute. Therapeutic intervention was not deemed necessary. The baby was discharged as completely recovered the following day.</p>