What was the reason for abstaining from using the past week? If you were genuinely trying to quit, then you should just try to keep it up, you have already made it through the worst and wouldn't want to start the withdrawal process all over again. However, you came here for harm reduction purposes and help, so I will give you my 0.02 anyway.
It isn't healthy to IV pills at all, but as an IV roxicodone user I don't have room to preach. If you typically eat atleast 80-100mg, and have only been off for 7 days, you should get well off on a 60mg dose. You're tolerance will not have dropped so significantly that you would need to start at only 10-20mgs. Have you ever IV'd prior to this?
For further information and the safest way to execute this method, definitely check out the megathreads focused on IV use, methods, and complications. They are great and also a big help.
***Btw- I just relized there is a previous post on here by "me." That post was actually made by my boyfriend- FM1983, who was too lazy to log off of my account and on to his own.