New grad here: how to give rest of IV medication that’s in the line?

This is a really dumb question sorry!!

At my hospital we use Alaris pumps. Let’s say I was giving an IVAB, I program the pump (select piptaz for example, press start), tick tick tick, the IV is done! But there’s some medication left in the line….

Based on my placement experience, I’ve seen some nurses take the line out and respike it into a 100ml saline bag, then start the IV pump again but only for like 5mins or something (I can’t really remember, it’s been a while 😅). But I feel like using a 100ml saline bag to just flush something feels like a waste?

I’ve also seen some nurses just take it out completely and just flush the cannula with a 10ml syringe. But what about the bit of medication that was still in the line? If you flush with a 10ml syringe, then the pt technically isn’t getting their full dose?

What’s the right way exactly?

Also another dumb question… To prevent the line from running dry, I’ve seen some nurses change the VTBI by subtracting 10/20ml (eg. VTBI is 100ml but to prevent it from running dry, they change it to like 85ml). I’ve also seen some nurses just leave the VTBI as it is. What do you guys do?

Ive done three supernumerary shifts so far but haven’t gotten a patient that requires IVABs yet. And it’s definitely been a while since my placement. TIA!