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This question usually arrives late, often in the gap between confirming an appointment and it happening, and the internet is full of confident answers to it. Almost all of them are wrong for somebody, because instructions about eating depend on what is being given, why, and who is receiving it. What follows is deliberately not a rule. It is the information that makes the rule you are given accurate, and the practical arrangements that make following it possible in a hotel in a city where meals happen elsewhere.
Why This Page Will Not Give You a Fasting Rule
Publishing an eating instruction for a treatment we know nothing about, for a person we have not assessed, would be false precision. Whether you should eat beforehand, how long before, whether anything should be avoided afterwards and whether any of it matters at all are decided by the clinician who has assessed you and who knows what is being proposed.
The Disclosures That Change the Answer
The instruction you get is only as good as what you told them. Several things routinely go unmentioned and all of them are relevant: that you have not eaten since yesterday, that you have not been able to keep food or drink down, that you are fasting for religious reasons, that you had a lot to drink last night, that you have an eating difficulty or a long-term condition affecting meals, that you are on a diet plan prescribed by your own doctor at home.
None of those are things to be embarrassed about in this conversation, and all of them can change advice. Not being able to keep anything down in particular is a fact about your situation rather than a detail about your day, and it deserves to be said plainly rather than mentioned in passing. Alcohol is the other one people minimise; the point of saying it is not judgement, it is accuracy.
Ramadan, Fasting and the Timing of an Appointment
Fasting for religious reasons is common among visitors to Istanbul and is worth raising when the appointment is being arranged rather than when someone is at the door. Said early, it is a scheduling variable like any other and an appointment can often be placed accordingly. Said late, it becomes an awkward conversation at exactly the wrong moment.
There is no need to justify the fast, and no clinician should expect you to. What is needed is that they know, because whatever instruction they would otherwise give may need to change. The same applies to anyone travelling with a fasting companion who is arranging things on their behalf: mention it in the request, not after the plan is fixed.
Hotel Logistics: Making the Instruction Possible
Following an eating instruction at home is easy because there is a kitchen. On a trip it can quietly fail. Hotel room service has hours and so does the breakfast room; many restaurants in Istanbul open later than visitors expect, and an appointment in a gap between services can leave you with an instruction you cannot follow and a vending machine.
Deal with it the way you would deal with any other logistics problem. Find out the hours of whatever is available where you are staying, keep something simple and tolerable in the room rather than relying on a plan to go out, and if you are in an apartment with no reception desk, notice that nobody will bring you anything at all. If someone is travelling with you, this is a genuinely useful job to hand them, and it is one of the few in this situation that does not require any medical knowledge.
Afterwards, Report Rather Than Interpret
If you were given instructions for after the appointment, follow those rather than anything on this page, and ask for them in writing if they were only spoken — later in the day is exactly when a remembered instruction becomes a disputed one. If you were given none, it is reasonable to ask what to expect and whether anything should be different for the rest of the day.
If something then does not go as described — you cannot manage food or drink, something feels different from what you were told to expect, or you are simply not sure — the response is to report it to whoever attended you rather than to work out what it means. Keep it factual: what you have managed, what you have not, and what has changed since they left. You are the person describing; the interpreting is someone else's job.
When Meals Are Not the Question
None of this applies if the situation turns. Severe difficulty breathing, severe chest pain, collapse or loss of consciousness, stroke-like symptoms, a severe allergic reaction including any swelling of the face, lips or throat, heavy bleeding or a serious injury all mean calling 112 in Türkiye or going straight to the nearest hospital emergency department. A reaction after eating or drinking anything is not something to sit with in a hotel room while you check whether it counts.
Related Services
- IV Therapy in Istanbul — the service itself, including the assessment that produces any instruction you are given.
- Hotel Doctor — an in-person assessment where you are staying, including when you cannot manage food or drink.
- Online Doctor Consultation — a remote conversation when the question is advice or follow-up rather than examination.
These pages describe what can be organised; instructions about eating come from the clinician attending you.
Frequently Asked Questions
- Should I eat before an IV treatment?
- Ask the clinician arranging it. The answer depends on what is proposed and on your own situation, which is why no honest general rule can be published here.
- Is there anything I should avoid afterwards?
- Follow whatever you were told by the person who attended you, and ask for it in writing if it was only spoken. If you were given nothing, it is reasonable to ask.
- I have not eaten for a day. Does that matter?
- It may, which is why it should be said rather than assumed to be irrelevant. Not being able to keep anything down matters even more and should be stated plainly.
- I am fasting for religious reasons. What should I do?
- Say so when the appointment is being arranged rather than on the day. Timing can often be planned around it, and the instruction you are given may differ.
- What if I cannot get food at my hotel at that hour?
- Treat it as logistics: check the hours where you are staying, keep something simple in the room, and remember an apartment with no reception desk supplies nothing at all.
- When does eating stop being the issue?
- When something may be urgent - severe breathing difficulty, severe chest pain, collapse, stroke-like symptoms, any swelling of the face, lips or throat, or heavy bleeding. Call 112 in Türkiye.
If you have an appointment coming and nobody has told you what to do about eating, ask CNR Medicare on WhatsApp before the day rather than on it.