convulsion

https://doi.org/10.1351/goldbook.10558

Sudden, violent, irregular movement of the body caused by involuntary contraction of muscles and associated with brain disorders, such as epilepsy, fever in children, or with drug or alcohol abuse.

Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 739 (https://doi.org/10.1515/pac-2015-1202)