If you use heroin after finishing withdrawal will you withdrawal after one time?

You will not suffer any withdrawal symptoms unless you use again.

Once you have gone through that awful experience of the withdrawal you never have to worry about feeling like that unless you pick up again.

The guideline I use is to not use anymore than 2 days in a row, if I go to 3 or more then the withdrawal always comes back

Best medication if you can find a doc who prescribes it, is Suboxone. Usually it is psychiatrists who have been specifically licensed to prescribe it. If you take that, (or Ultram) withdrawal is comfortable. Contact a drug clinic for a referral for a doc who prescribes on out patient status

Just always be prepared to have to go through it again if you use more than 2 days.