Tirzepatide Headaches: What to Know on Compounded Tirzepatide
Headaches can happen on tirzepatide, but they aren't one of its common side effects, whether you inject from a pen or a vial. Headache isn't among the common side effects reported in weight-loss trials of FDA-approved tirzepatide, 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 tirzepatide doses, so you can see whether they follow your shot or something else in your week.
Key numbers
| Number | What it means |
|---|---|
| 5,027 | users currently tracking tirzepatide-related headaches in Glapp |
Tirzepatide headaches: what the clinical evidence shows
The best evidence on tirzepatide comes from the FDA-approved versions, Zepbound and Mounjaro, which contain the same molecule. Zepbound's prescribing information lists every side effect reported by at least 2% of people in two pooled weight-loss trials (958 on placebo, 2,519 on tirzepatide) 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% |
*Includes decreased blood pressure, hypotension and orthostatic hypotension. Source: Zepbound prescribing information, Table 1.
Why does tirzepatide cause headaches?
Headaches on tirzepatide are 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.
Dehydration, skipped meals and caffeine: the usual suspects
- 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 tirzepatide headaches with a GLP-1 tracker app
A headache could be tirzepatide, or the coffee you skipped. A GLP-1 tracker helps you tell the difference: log each headache next to your tirzepatide 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 people who take GLP-1 medications themselves, which is why it handles the everyday side of compounded tirzepatide that brand-name pen trackers skip:
- Built-in dosage calculator. Glapp shows the units for the dose and concentration you enter. Confirm with your pharmacist.
- Vial and supply tracking. Every dose you log comes off your active vial, so you always know what's left, down to the unit.
It's grounded in published clinical trial data and peer-reviewed research, core tracking is free, and you get custom titration curves plus syncing across iPhone, Android and web. 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. Log each dose too.
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 tirzepatide 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? Did they start with a new vial? 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 tirzepatide headaches in Glapp
Headaches and dose steps on compounded tirzepatide: units, mg and why measuring matters
Tirzepatide usually starts at 2.5 mg once a week and steps up by 2.5 mg at least four weeks apart, to a maintenance dose between 5 and 15 mg. The trials don't report headache by dose, but most nausea, vomiting and diarrhea happened during dose escalation, which is when fluid-related headaches are most likely too.
Tirzepatide from a vial is drawn up with a U-100 insulin syringe, where 1 unit = 0.01 mL. How many mg that holds depends on your vial's concentration:
mg = units × concentration (mg/mL) ÷ 100
| Dose | Units at 10 mg/mL | Units at 20 mg/mL |
|---|---|---|
| 2.5 mg | 25 | 12.5 |
| 5 mg | 50 | 25 |
| 7.5 mg | 75 | 37.5 |
| 10 mg | 100 | 50 |
| 12.5 mg | 125 | 62.5 |
| 15 mg | 150 | 75 |
Example concentrations only. Concentrations vary between pharmacies, so always use the concentration on your vial and your prescriber's or pharmacist's instructions. Over 100 units is more than a U-100 syringe holds. Ask your pharmacist.
If headaches start or get much worse after a new vial, a new pharmacy or a new syringe size, check your concentration and units first, and call your prescriber or pharmacist.
What to bring to your prescriber
A simple log shows your prescriber the pattern at a glance:
| Week | Dose (mg / units) | Headache days | Strongest day after shot | Peak rating | Other side effects logged |
|---|---|---|---|---|---|
| Example 1 | 5 mg / 50 units | 3 | Day 2 | Med | Nausea |
| Example 2 | 5 mg / 50 units | 3 | Day 2 | Med | Diarrhea |
| Example 3 | 5 mg / 50 units | 2 | Day 1 | Low | None |
| Example 4 | 5 mg / 50 units | 1 | Day 2 | Low | None |
Questions you could ask. They're conversation starters, not recommendations; your prescriber decides what, if anything, to change.
- "My headaches come on the same days as my stomach side effects. Could they be linked?"
- "Can you double-check my dose in units against my vial's concentration?"
- "Which pain reliever is OK to take with tirzepatide?"
Frequently asked questions
Is headache a side effect of tirzepatide?
It isn't listed among the common side effects in weight-loss trials of FDA-approved 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.
How long do tirzepatide headaches last?
Most headaches linked to starting tirzepatide are short-lived. They tend to ease as you settle on a dose and keep up with fluids and regular eating, and caffeine-withdrawal headaches usually pass within a few days. If they keep coming after several weeks, or feel different from your usual headaches, talk to your prescriber.
Can compounded tirzepatide cause headaches if the dose is wrong?
A dose higher than intended can make side effects stronger. If headaches start with a new vial, check your units and concentration with your pharmacist.
How do I track tirzepatide headaches?
Log them in Glapp's daily check-in and rate them low, medium or high, with your dose in mg. Glapp shows each rating next to your estimated medication level, so you can see whether they follow your shot.
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, adverse reactions.
- U.S. Food and Drug Administration. FDA's concerns with unapproved GLP-1 drugs used for weight loss.