Final answer:
The identified substance in the overdose with anticholinergic symptoms is likely to be antihistamines.
Step-by-step explanation:
In the case of an overdose with anticholinergic symptoms, the identified substance is likely to be antihistamines. Antihistamines, such as diphenhydramine (Benadryl), can cause anticholinergic symptoms like dry mouth, blurred vision, urinary retention, constipation, and increased heart rate. People with asthma are at higher risk of experiencing severe side effects from antihistamines due to their already compromised respiratory function. An overdose is a serious situation that requires immediate medical attention. As such, anyone suspecting that an overdose has occurred should seek immediate help, such as contacting the local poison control center or calling for emergency medical assistance.
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