Precautionary (adjective)

1. Taken or done as a precaution or in preparation for possible future events.
2. Done or taken to prevent or reduce the risk of something bad happening.

Origin:

From precaution + -ary.

Examples:

1. The company took a precautionary measure by installing security cameras.
2. The government issued a precautionary warning to the citizens to stay indoors.
3. The school closed as a precautionary measure in response to the flu outbreak.
4. The authorities are taking precautionary steps to prevent a recurrence of the accident.
5. The company implemented precautionary measures to protect the employees from the COVID-19.