US study suggests GLP-1s, used to treat type 2 diabetes, could also reduce risk of people already using substances from overdosing US study suggests GLP-1s, used to treat type 2 diabetes, could also reduce risk of people already using substances from overdosing Weight loss drugs could help people avoid getting addicted to alcohol, tobacco and drugs such as cannabis and cocaine, a study has found. They could also reduce the risk of people already addicted to illicit substances having an overdose,