Ahh, alright, just checking. I didn't want things to disagree. :-)
If Alexi tries to give him the drug himself, especially two days from now, Erik will absolutely avoid the vial and try and get a drink directly out of his arm. It would be safer for Joseph to do it, because he understands what Erik is going through and knows how to overpower him. Between blood hunger, food hunger, and the draining effect of the chains, Erik is quite weak now, compared to other vampires. But he's still stronger and faster than humans.