Ramadan Fatwa: Would taking an injection break my fast?

If the injection is nourishing, then it breaks the fast.

If you are on long-term medication and your medicine is in injection form, does the injection break the fast?
The medicine injection in a muscle or a vein does not breaks one's fasting because the medical substance does not enter the belly directly by a normal open access. Rather, it is somehow like seeping inside through the skin, and this does not invalidate the fast. However, if the injection is nourishing, i.e., it substitutes eating and drinking, then it breaks the fast. 
Ramadan Fatwa: What happens if you break your fast before Maghrib?

• Ramadan 2021