[…] heartbeat, fainting, or seizure (severe hypoglycemia can be fatal).
[rxlist.com]
Symptoms of severe hypoglycemia include extreme weakness, nausea, tremors, sweating, confusion, trouble speaking, fast heartbeats, or seizure.
[everydayhealth.com]
The most common side effect of Diabinese is low blood sugar ( hypoglycemia ).
[rxlist.com]