What should a rescuer do if a casualty is experiencing a seizure?

When a rescuer observes a casualty experiencing a seizure, timing the duration of the seizure is crucial. This information is important as it helps medical professionals understand the severity and specifics of the seizure, guiding them in providing appropriate care. Seizures that last longer than a recommended duration, typically around five minutes, may indicate a medical emergency, such as status epilepticus, requiring immediate intervention.

Properly timing the seizure also allows caregivers to monitor the patient's condition and make informed decisions about seeking emergency care, ensuring that the casualty receives the right support based on the characteristics and duration of the episode. Gathering this information can be vital for the healthcare team upon their arrival, enhancing the overall effectiveness of the medical response.

The other options may not align with best practices for managing seizures. For example, restricting the casualty's movements could lead to injury, and placing a wedge under their head may not be safe or beneficial. Administering medication should only be done by trained professionals and typically not during the seizure. Thus, timing the seizure is the most appropriate and effective action to take in this situation.