What is the ruling on taking intravenous injections during Ramadhan when we are fasting? Is it permissible? Does it break the fast? What about other types of injections? Will they break the fast?
There is a difference of opinion amongst scholars regarding this issue. To get a more precise answer, you will have to specify your marja’.
Nevertheless, we will list the opinions of different marja’s below:
Ayatollahs Bahjat, Imam Khomeini and Khamenei: If an injection is nutritional or a tonic (taken for strengthening the body), as an obligatory precaution, one must refrain from taking it, but if it is for medicinal or anesthetizing purposes, it is okay.
Ayatollah Fazel Lankarani: Nutritional or tonic injections are impermissible (break the fast), but medicinal or anesthetizing ones are permissible.
Ayatollah Makarem Shirazi: Nutritional, tonic and medicinal are problematic as an obligatory precaution, but anesthetizing ones are permissible.
Ayatollahs Tabrizi, Sistani, Safi, Nouri and Vahid: No injections break the fast whether they are tonics and for nutritional purposes, or for medicinal purposes and the like.
Ayatollah Hadavi Tehrani has replied to this inquiry in such:
Taking injections aren’t considered eating or drinking and don’t break the fast (making taking them permissible), although it is better to refrain from nutritional injections and ones that are tonics.
 Tawdihul-Masa’el of the Maraje’, vol. q, pg. 892, issue 1576; Ayatollah Khamenei, Ajwibatul-Istifta’at (Replies to Islamic Inquiries), question 767; Ayatollah Vahid Khorasani, Tawdihul-Masa’el, issue 4851.