Anaesthesia and elective surgery: the aspiration question — does this still hold?

Anaesthesia and elective surgery: the aspiration question — does this still hold? I have a specific reason for asking rather than idle curiosity, and the context is below.

Practical question with the units stated, because I have seen how quickly these go wrong without them.

I have a 2 mg vial of retatrutide and I am working to a 0.5 mg step. My syringes are U-100 insulin syringes, 0.5 mL barrel.

I can do the arithmetic and I have done it twice, getting the same answer both times, but I would like someone to check the reasoning rather than the number — specifically whether I have thought about the residual volume correctly, and whether the graduation I am landing on is one a person can actually read.

Food interactions: most interactions are absorption interactions. Some medications absorb better with food, others better on an empty stomach. With an incretin agonist that already slows gastric emptying, food effects interact with the drug effect as well.

This follows post #14 rather than contradicting it.

Insulin interaction: semaglutide and tirzepatide are not contraindicated with insulin but the combination carries hypoglycemia risk if insulin doses are not adjusted. That is a reason for close monitoring, not for avoiding the combination.

Separation timing versus clinically important interaction: a separation timing inconvenience (taking one medication 2 hours before or after another) is not the same as a clinically important interaction. Both can reduce absorption of one or the other, but only true interactions require active management.