If someone has a seizure and falls, clear the area around them, lay them on their side, time it by the clock, and put nothing in their mouth

High value
Evidence B
Buys life
Free
Takes minutes
No willpower

In a real emergency, call 911 first, then read this.

In plain words

Move hard objects away from around them, lay them on their side with the mouth facing down, and watch the clock to note the time. Don't hold them down, don't pry the mouth open, and don't put anything in the mouth, because that only injures the teeth and jaw. Call an ambulance if it goes on for more than 5 minutes, if another seizure follows soon after it stops, if the person can't be woken or has trouble breathing afterward, if it happens in water, or if it is their first seizure. Give water only once the person is fully awake.

Cost: Free.
What you get: Avoids the tooth and jaw injuries caused by prying the mouth open and forcing in hard objects. Avoids the fractures caused by forcibly holding the person down. A seizure that goes on for more than 5 minutes is the red line for calling an ambulance
Notes: The same page lists other cases that call for an ambulance at once: another seizure soon after one ends, being unable to wake the person or trouble breathing afterward, injury during the seizure, a seizure in water, and a first-time seizure. When the seizure stops, lay the person on their side with the mouth facing down, and give water only once they are fully awake. These steps are most useful where someone in the home has epilepsy. Doing the same for a stranger gives you a smaller chance of benefit coming back to you, but it will not make you liable either (Civil Code Article 184, see §13.2, don't rush to pull the person up).
Evidence grade: B : Supported by research but without a precise number, or based on small or single studies.
Sources: 美国疾病控制与预防中心. 癫痫发作急救：「Don't hold the person down or stop their movements」「Don't put anything in their mouth. This can hurt their teeth or jaw」「Don't offer water or food until they are fully alert」「Time the seizure to track if it lasts more than 5 minutes. If it does, seek immediate medical attention or call 911」. https://www.cdc.gov/epilepsy/first-aid-for-seizures/index.html

Translated from the Chinese original. Original book, section 13, tip 16. Content may be out of date and rules differ by place. When you actually deal with an agency, a doctor or a court, follow what local officials, doctors and lawyers tell you. Disclaimer