Yom Kippur 2026 begins at sundown on Sunday, September 20, and ends at nightfall on Monday, September 21 [1]. If you take daily medicine, you need two conversations before the fast: one with your clinician about whether fasting is medically safe for you, and one with your rav about how to take your medicine if you do fast. This guide explains what the halachic literature says and who makes each call.
Peninei Halakha states that on Yom Kippur even the infirm are obligated to fast because it is a Biblical command [2]. The exemption applies only to people whose lives may be in danger if they fast, because the preservation of human life overrides the Torah's commandments [2]. That is the halachic frame. Whether your condition or your medicine puts you in that category is a medical question for your clinician and a religious question for your rav, and your rav may hold differently from any position this guide records.
What Peninei Halakha says about medicine on fast days
Peninei Halakha addresses medicine directly. The text states that sick people who need to take medicine regularly, such as a person who suffers from a chronic disease, must continue taking their medicine even on a fast day [2]. The method matters: if possible, swallow the pill without water. Almost no medicine does any harm when taken without water [2]. If you cannot swallow a pill dry, add something bitter to the water until it becomes undrinkable and use it to swallow the pill [2].
The logic is that taking medicine is not eating or drinking in the halachic sense when the substance is not palatable. A bitter liquid is not drinkable. A pill swallowed dry is not food. The medicine itself is permitted because your life or your health depends on it.
This is Peninei Halakha's position. Your own rav may hold differently, and your rav makes the ruling for your situation. Some communities follow different halachic authorities, and some rabbinic authorities have issued their own guidance on specific medicines or conditions. The question to bring to your rav is whether this approach applies to your medicine and your condition, or whether your rav directs something different.
Yom Kippur differs from other fast days
Peninei Halakha distinguishes Yom Kippur from the other fasts the Rabbis instituted [2]. On those minor fasts, anyone who is sick is exempt from fasting even if the condition is not life-threatening [2]. In general, people whose pain or weakness precludes them from continuing their regular routine of life, forcing them to lie down, are considered sick and exempt [2].
Yom Kippur is different because it is a Biblical command. The exemption is narrower: only people whose lives may be in danger [2]. Peninei Halakha also records that Tisha B'Av sits between the two, with some poskim making a distinction and others not [2]. Your rav knows your community's custom and can tell you how it applies to your case.
The two conversations to have before Elul ends
Start with your clinician. The medical question comes first because it is the foundation for everything else. Your clinician knows your exact condition, your exact medicine list, and the medical risk of fasting. They can tell you whether fasting is safe for you, whether your medicine can be taken without water, and whether there are any changes to your routine that would make fasting safer if you choose to fast.
Write down the specific questions before the appointment. Ask whether you can fast safely with your condition. Ask whether your medicine can be swallowed without water. Ask what to do if you cannot swallow it dry. Ask whether there is anything you should do differently on the fast day itself. Ask what symptoms would mean you need to break the fast. Bring your medicine bottles so your clinician can see the exact formulation.
Then bring the medical facts to your rav. Tell your rav what your clinician said about the medical safety of fasting. Bring the names and forms of your medicines. Ask your rav whether Peninei Halakha's approach to medicine applies to your situation, or whether your rav directs something different. Ask what to do if you cannot swallow a pill without water. Ask whether there are any other medicines or conditions your rav wants to discuss. Ask what to do if symptoms arise during the fast.
Your rav and your clinician are the decision-makers. This guide explains what one named halachic source says and routes the religious call to your rav. It does not tell you whether you should fast.
Who answers which Yom Kippur medication question
Here is the division of labor for the questions that come up most often.
| Question | Who answers it | What to bring them |
|---|---|---|
| Can I safely fast with my condition? | Your clinician | Your medicine list, your medical history, your symptoms, your blood sugar logs if you have them |
| What does the halachic literature say about pills on a fast day? | The named sources and your rav | Peninei Halakha's statement that medicine must continue and can be taken without water or with bitter water [2] |
| Does this apply to me? | Your rav | Your clinician's assessment of your medical safety, the names and forms of your medicines, your condition |
| Can I swallow my pill without water? | Your clinician | Your medicine bottle and your ability to swallow pills dry |
| What if I cannot swallow it without water? | Your rav, informed by your clinician | Peninei Halakha's statement about bitter water [2], your clinician's confirmation that bitter water is medically safe for you |
| What should I do if I feel sick during the fast? | Your clinician in advance, your rav for the ruling | Your symptoms, your medicine, your blood sugar or other measurements if relevant |
Specific medicines and Yom Kippur
The label does not state a Yom Kippur status for any medicine. Yom Kippur medicine questions are halachic questions, not ingredient questions. Passover has published medicine lists because Passover has specific rules about ingredients like chametz and kitniyot. Yom Kippur has no equivalent ingredient rules, so there is no published Yom Kippur medicine list.
Your rav rules on your medicine based on your condition, your clinician's assessment, and the halachic sources your rav follows. If you take a GLP-1 receptor agonist like semaglutide, the label states that the peptide backbone is produced by yeast fermentation [3], but that fact alone does not determine a Yom Kippur ruling. The ruling is your rav's call.
If you take diabetes medicine or any other chronic medicine, the same principle applies. Bring the medicine name and form to your rav. Ask your rav whether it is permitted on Yom Kippur and how to take it if you fast. Your rav's answer is the one that applies to you.
For more on fasting with specific conditions, see the guides on fasting with diabetes and taking medication on fast days. The guides hub collects all the fasting and medication resources in one place.
What to do next
- Check the exact Yom Kippur times for your city on Hebcal or ask your community.
- Schedule an appointment with your clinician for at least 2 weeks before Yom Kippur. Write down your questions about fasting safety, medicine without water, and what to do if symptoms arise.
- Bring your medicine bottles to the appointment so your clinician can see the exact form of each medicine.
- Ask your clinician whether you can swallow each medicine without water, or whether bitter water is medically safe for you.
- Write down your clinician's answers and bring them to your rav.
- Schedule an appointment with your rav for at least 1 week before Yom Kippur. Bring the medicine names, forms, and your clinician's assessment of the medical safety of fasting.
- Ask your rav whether Peninei Halakha's approach applies to your situation, or whether your rav directs something different.
- Ask your rav what to do if you feel sick during the fast and cannot continue.
- If you use a blood glucose meter or any other monitoring device, bring your recent logs to both appointments.
- Never skip, delay, split or change any medicine without your clinician's explicit instruction.
Sources
- Hebcal, Yom Kippur 2026, Yom Kippur dates and times, accessed 2026-08-09, https://www.hebcal.com/holidays/yom-kippur-2026
- Peninei Halakha, the infirm are exempt from fasting, medicine on fast days and Yom Kippur exemptions, accessed 2026-08-09, https://ph.yhb.org.il/en/05-07-07/
- DailyMed, Ozempic (semaglutide) prescribing information, yeast fermentation and inactive ingredients, accessed 2026-08-09, https://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=adec4fd2-6858-4c99-91d4-531f5f2a2d79