Ozempic. .25 / .50 pen (red box)

Weight loss injection done 1 time per week starting at .25 for 4 weeks

then moving up to .50 for a additional 4 weeks if you can tolerate it.
pen has 8 .25 doses or 4 .50 doses

how long it lasts depends on you and your tolerance at the end of the 4 weeks and how you plan to inject.

injection to the stomach about 2 inches from the belly button.

pen comes with everything you need to inject.  This is one pen that has enough for several doses.  8 .25 doses or 4 .50 doses You will reuse the pen each dose. Replacing the needle every injection. The box comes with 6 needles since it is intended to be used as follows: .25 for the first 4 weeks (1per week) then .50 for 4 more weeks (1 .50 dose per week) so the pen can lasts 6 weeks following this regimen. But, can last up to 8 weeks.