How long after heroin is it safe to take suboxone?

Depends: On how much you are taking. Small amounts can go immediately onto the drug. Very large amounts require up to twenty four hours and there can be precipitated withdrawal even then.

No Time: It is never really safe to take heroin. I am sorry to sound preachy, but them's the facts. A heroin addict needs to get on Suboxone and stay on it. You probably already know that an untreated heroin addict will usually end up in one of three places. Jail-hospital-cemetery. Please seek out help for yourself right away.