Talk to the doctor and ensure medical support for a gradual withdrawal program. If a doctor hasn't been seen for a while, make an appointment to have the medication reviewed and to discuss alternatives. Try to work out what triggers the desire to use benzodiazepines. Keeping a 'diary of use' for one week can help identify these situations. If someone overdoses or has an adverse reaction while using benzodiazepines it is very important that they receive professional help as soon as possible.
Quick responses can save lives.
Call an ambulance. Don't delay because you think you or your friend might get into trouble. Ambulance officers are not obliged to involve the police. Stay with the person until the ambulance arrives. Ensure adequate air by keeping crowds back and opening windows.