Dr. Zakir: As far as injections are concerned, there are different types of injections. It can be intravenous injection, it can be intra muscular injection, it can be Subsequent injection. But the injections can broadly be classified in two types. One type of injection which gives a person a nourishment, which is equivalent to giving food.
For example if you take an intravenous glucose, the people who have excessive dehydration etc, and cannot take food by the mouth. So the normally the medical treatment is giving intravenous glucose, this is sort of nourishment, it is equivalent to giving food, this will break the fast. But if it's not a nourishment, if it's only a medical treatment like insulin, it can be subcutaneously or it is penicillin all these medical treatments which are not nourishment to the body, are not some what like food these can be given during the day time and the fast will not break. Though there are some scholars who say that it's Maqrooh or discouraged. It's preferable if it's taken after the sunset, but the right ruling is that it does not break the fast because it's not any sought of food.