The following was found in the first aid treatment for the chemical
Coumaphos on the www.epa.gov web site (no document for the chemical used in
Apistan was found):


Signs and Symptoms of Acute Coumaphos Exposure:

Note:  Coumaphos is a cholinesterase inhibitor.

Acute exposure to coumaphos may produce the following signs and symptoms:
pinpoint pupils, blurred vision, headache, dizziness, muscle spasms, and
profound weakness.  Vomiting, diarrhea, abdominal pain, seizures, and coma may
also occur.  The heart rate may decrease following oral exposure or increase
following dermal exposure.  Hypotension (low blood pressure) and chest pain may
be noted.  Hypertension (high blood pressure) is not uncommon.  Respiratory
effects include dyspnea (shortness of breath), respiratory depression, and
respiratory paralysis.  Psychosis may occur.