Does Zepbound Cause Headaches? Clinical Data, Causes & How to Keep Them Under Control
Headaches can happen on Zepbound, but they aren't one of its common side effects. Headache isn't among the common side effects reported in clinical trials of Zepbound (tirzepatide) for weight loss, which included more than 2,500 people on the medication (Zepbound prescribing information). So if you're getting them, it's worth finding out what's behind yours. Glapp, the GLP-1 tracker, lets you log each headache right next to your Zepbound doses, so you can see whether they follow your shot or something else in your week.
Key numbers
| Number | What it means |
|---|---|
| 6,935 | users currently tracking Zepbound-related headaches in Glapp |
Zepbound headache: what the clinical evidence shows
Zepbound's prescribing information lists every side effect reported by at least 2% of people in two pooled weight-loss trials of tirzepatide (958 on placebo, 2,519 on Zepbound) and more often than on placebo. Headache isn't on that list. These related effects are:
| Side effect | Placebo | 5 mg | 10 mg | 15 mg |
|---|---|---|---|---|
| Dizziness | 2% | 4% | 5% | 4% |
| Low blood pressure* | 0% | 1% | 1% | 2% |
| Nausea | 8% | 25% | 29% | 28% |
| Vomiting | 2% | 8% | 11% | 13% |
| Diarrhea | 8% | 19% | 21% | 23% |
*Includes decreased blood pressure, hypotension and orthostatic hypotension. Source: Zepbound prescribing information, Table 1.
So if you get headaches on Zepbound, they're less likely to be a direct effect of the drug and more likely to travel with something it does cause: lost fluids, lower blood pressure or much less food than you're used to.
Why do you get headaches on Zepbound?
Three effects that do show up in the tirzepatide trials can each set off a headache:
- Dehydration. Vomiting and diarrhea cost fluid, and Zepbound's prescribing information warns that dehydration from stomach side effects can become serious.
- Lower blood pressure. Reported in 1–2% of people on Zepbound vs none on placebo, often felt as dizziness or lightheadedness, especially when standing up.
- Eating much less. Zepbound sharply reduces appetite, and long gaps without food can bring on headaches for some people.
Log your headaches alongside your stomach symptoms in Glapp. If headaches land on your worst stomach days, fluids are a likely link worth raising with your prescriber. A sudden, severe or unusual headache needs prompt medical attention whatever the cause.
Dehydration, skipped meals and caffeine: the usual suspects
Most headaches on Zepbound trace back to a few everyday triggers:
- Dehydration. Drinking less as your appetite drops, or losing fluids through nausea or diarrhea, is the most common one.
- Long gaps without food. Going many hours without eating can bring on a headache for some people.
- Caffeine changes. If you've cut back on coffee or energy drinks along with food, a withdrawal headache can follow for a few days.
- Lower blood pressure. Blood pressure often falls as you lose weight, especially if you take blood pressure medicine, and that can feel like a dull headache or lightheadedness.
A sudden, severe headache, or one with vision changes, confusion, weakness or a stiff neck, needs urgent care.
Track your Zepbound headaches with a GLP-1 tracker app
A headache could be Zepbound, or the coffee you skipped. A GLP-1 tracker helps you tell the difference: log each headache next to your Zepbound doses, and you're in control. You'll know which days after your shot they come, how strong they are and whether they're easing, and you'll walk into your next appointment with facts instead of guesses.
Why Glapp? It's a top-rated GLP-1 tracker used by 100,000+ people, rated 4.8/5 on Trustpilot and the App Store, and 4.6/5 on Google Play. Glapp grew out of Reddit GLP-1 support groups and is built by developers who are GLP-1 users themselves, so most features come straight from community requests. Its features are grounded in peer-reviewed research and published clinical trial data, core tracking is free, and it works on iPhone, Android and web with your data synced across devices. Here's how to use it over your first 30 days.
Glapp does not provide medical advice or treat side effects. It shows your daily check-ins against your estimated medication levels so you have structured data to share with your prescriber.
Day 1: Start tracking your headaches
Use Glapp's daily check-in to record each headache and rate how severe it feels.
Daily entries help you see whether your headaches are getting better, getting worse or staying the same. You'll have a clear record of how you felt, without having to remember every day.
Day 3: Compare symptoms with your estimated Zepbound level
Glapp estimates your medication level throughout the day using your dose and injection time. Tirzepatide typically reaches its highest blood concentration 8–72 hours after an injection.
Seeing your symptoms alongside this estimate helps you spot when headaches appear within your shot cycle. As you log more days, you can look for a repeating pattern and know when to pay closer attention.
The medication level is an estimate, not a blood test, and a matching pattern does not prove what caused your symptoms.
Day 7: See how your headaches change over time
Open the side-effects chart in the Progress tab and choose the period you want to review. Your daily ratings appear on a timeline, making it easier to see whether a difficult day was an isolated episode or part of a longer trend.
Day 14: Look for patterns in your weekly report
Glapp's weekly progress report brings your logged data together, with dedicated sections showing your side effects and how they change.
Do your headaches tend to return on the same day after your shot? Do they coincide with changes in hunger or food noise? Reviewing two weeks of entries can help you spot patterns that are easy to miss day by day, and give you specific questions to discuss with your doctor.
Day 30: Bring a clear record to your doctor
After a month, review the bigger picture: are your headaches becoming less frequent, staying the same or getting worse? Tirzepatide generally reaches a steady repeating level after about four weeks of weekly injections at the same dose.
Create a doctor's report in Glapp and choose the information to include. Your doctor can review your symptom history alongside your doses and progress, giving you a more focused conversation about your treatment.
Start tracking your Zepbound side effects in Glapp
Headaches after a dose step: what to watch
Zepbound starts at 2.5 mg for four weeks, then rises by 2.5 mg at least four weeks apart, to 5, 10 or 15 mg. The tirzepatide trials don't report headache by dose, but they do show most nausea, vomiting and diarrhea happening during dose escalation and then easing, which is when fluid-related headaches are most likely too.
Check in every day for two weeks after each step. Your weekly progress report will show whether headaches rose with the new dose.
See every dose in the Zepbound dosage chart and plan steps with the titration planner.
What to bring to your prescriber
Show headaches next to what happened around them:
| Date | Day after shot | Dose (week since last increase) | Headache | Other side effects logged | Estimated level |
|---|---|---|---|---|---|
| Example Sun 1 Nov | Day 1 | 5 mg (week 1) | Med | Nausea, vomiting | Rising to peak |
| Example Mon 2 Nov | Day 2 | 5 mg (week 1) | Med | Diarrhea | Near peak |
| Example Wed 4 Nov | Day 4 | 5 mg (week 1) | Low | None | Falling |
| Example Sat 7 Nov | Day 7 | 5 mg (week 2) | None logged | None | Lowest, before next shot |
Questions you could ask. They're conversation starters, not recommendations; your prescriber decides what, if anything, to change.
- "My headaches tend to come on the same days as my stomach symptoms. Could I be getting dehydrated?"
- "I sometimes feel dizzy when I stand up. Should we check my blood pressure?"
- "Could anything other than Zepbound be causing these headaches?"
Frequently asked questions
Is headache a side effect of Zepbound?
It isn't listed among the common side effects in clinical trials of Zepbound (tirzepatide). Dizziness (4–5% vs 2% on placebo), low blood pressure and stomach side effects that can dehydrate you are, and each can bring on a headache.
Why do I get a headache the day after my Zepbound shot?
Tirzepatide peaks a median of 24 hours after a shot, and stomach side effects are most common early on. Logging headache and stomach symptoms together in Glapp shows whether your headaches follow them.
Can Zepbound make you dizzy?
Yes. Dizziness was reported by 4% of people at 5 mg, 5% at 10 mg and 4% at 15 mg, compared with 2% on placebo.
How do I track headaches on Zepbound?
Add headache to Glapp's daily check-in and rate it low, medium or high. Glapp shows it next to your other side effects and your estimated Zepbound level, and sums up the pattern in your weekly report.
About the data
Ratings are self-reported and medication levels are estimated from dose and timing, not measured. This page is for information only and is not medical advice; talk to your prescriber about any side effect.
About the author
We're GLP-1 patients and health tech professionals, building Glapp in collaboration with doctors. About us
Sources
- Eli Lilly. Zepbound (tirzepatide) prescribing information: Table 1, warnings (acute kidney injury, hypotension), pharmacokinetics.