What is the ruling on injections [while fasting]?
Shaykh Muqbil ibn Hādi al-Wādiʿī:
There are those from the people of knowledge who say, ‘if the injection is nutritious then do not use it [whilst fasting] and if it does not then it is okay to use. Our advice has proceeded for the person that is ill, and that is he should break his fast so that there isn’t a doubt [in regards to the correctness] of his fast, and he should make it up later.
[TN]: The Permanent Committee of Major Scholars in Saudi Arabia were asked, Fatwa no. 5176
What is the ruling on having injection during the daytime in Ramaḍān whether for nutrition or treatment?
They answered: It is permissible for a person observing Sawm (Fast) to be treated by injections, whether intravenous or intramuscular, during the day in Ramaḍān. But it is not permissible to have nutritive injections, as they come under the same ruling as having food and drinks. Thus, taking them is considered a trick to break Sawm ḍān. If it is possible to have the intravenous or intramuscular injections during the night, it will be better. May Allāh grant us success. May peace and blessings be upon our Prophet Muāammad, his family, and Companions.