If you're with someone who needs medical help, call an ambulance and tell the paramedics everything you know about the drugs taken, it could save their life. If you have any drugs left, hand them over to the paramedics as it may help. In most circumstances they won't tell the police, as they have a right to protect patient confidentiality. However, if the paramedics deem there is a threat they are legally required to disclose the information to the police.
