Normally prohibited as a tolda (derivative) of the av malacha (main category of work) shochet (slaughter) drawing blood is forbidden by the Torah. If someone were taking an injectable medication/supplement several times each day and thus it would be unavoidable on shabbos unless he/she suspended using it altogether on that day under what circumstances would it be allowed to be used on shabbos? Would it only be permitted if not using it was life threatening? What if it wasn't life threatening but stopping for a day would make it less effective?

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    JSYK it’s not so simple that drawing blood is forbidden because of Shechitah. Some Rishonim say it’s an issue of threshing or shearing (among many other opinions). Everyone agrees it’s forbidden, but depending on why exactly it’s forbidden you might get a different answer. For instance, if it’s an issue of shearing, it might only be Rabbinic as a מלאכה שאינה צריכה לגופה and therefore leniencies may apply since it’s for medical purposes. – DonielF Nov 15 at 4:38
  • פסיק רישא דלא ניחא ליה – kouty Nov 15 at 5:27

According to Rav Ovadia Yosef, one would indeed be permitted to continue a course of antibiotics or any course of medication one had started taking prior to Shabbat.

This article on Rav Ovadia Yosef's ruling quotes Hagaon Harav Shlomo Kluger as stating that since one had begun the course of medication beforehand, there is no concern of having to prepare the medication on Shabbat itself.

There does not appear to be a difference in this matter between pills and injectables; an injection is very different from bloodletting.

  • Where does the article discuss injections? – DonielF Nov 15 at 4:36
  • Halachically, how is getting an injection any different from taking a pill? The article discusses antibiotics and hormone treatments, both of which can come in either pill or injection form, @Doniel – Josh K Nov 15 at 4:54
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    Like the OP says - a pill is at worst an issue of refuah on Shabbos, a d’Rabbanan, whereas injections require puncturing of skin and possibly drawing blood in the process, which may be d’Oraisa. – DonielF Nov 15 at 5:10
  • I understand the line of reasoning, @Doniel, but I just don't see how some blood accidentally seeping out od an injection insert point could be compared to potentially d'Orasia intentional bloodletting. Hopefully someone will come up with an answer that specifically adresses that point. – Josh K Nov 15 at 5:16
  • Certainly it’s a d’Rabbanan of מתעסק, and you haven’t justified that being permitted for this. – DonielF Nov 15 at 5:35

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