What happpen if glucose is injected fast?

Answer 1

Fast or slow, injecting glucose would do the same thing. It would raise blood glucose levels that would trigger a release of insulin so the body could manage it so the blood glucose level would return to normal.

Answer 2

When medication is injected too quickly, several things can happen. The most serious of these is that the medication will take effect too quickly on your body. However, other serious effects can occur - for example, you can cause small bubbles of air to form in your bloodstream, which can be fatal if they're not dealt with.