What to Do If You Double Dose Semaglutide or Tirzepatide

If you took a double dose of semaglutide or tirzepatide, call Poison Help at 1-800-222-1222 or your clinical team now, even if you feel fine. Go to the ER right away if you can't stop vomiting, feel shaky, sweaty or confused, or have severe belly pain that won't go away. Both drugs stay in your body for days, so symptoms can show up after the shot. In poison center records, most accidental GLP-1 doses ended with stomach symptoms rather than serious harm.

What should I do right after a double dose of semaglutide or tirzepatide?

1. Work out how much you took. With a pen, the dose is preset, so a second shot means two of your usual dose. With a vial and syringe, check whether you drew up units, milliliters or milligrams. In FDA reports on compounded semaglutide dosing errors, mixing these up led people to draw up 5 to 20 times the intended dose, such as 50 units instead of 5. Know which mistake you made before you call, because that number matters.

2. Call Poison Help at 1-800-222-1222 or your clinical team. Both drug labels point to this number. The Wegovy label says to consider contacting Poison Help or a medical toxicologist after an overdose. The Zepbound Medication Guide says that if you take too much, you should call your healthcare provider or Poison Help at 1-800-222-1222, or go to the nearest emergency room right away.

3. Keep sipping fluids. Vomiting and diarrhea can dry you out, and the Zepbound Medication Guide notes that dehydration can cause kidney problems. Drinking fluids lowers that chance.

4. Don't add, skip or move a dose on your own to "balance it out." Stay on your prescribed schedule. Researchers who studied GLP-1 overdoses in the emergency department advise following the prescribed schedule without doubling doses. Ask your clinical team what to do about your next shot.

What symptoms mean I need the ER after taking too much?

• Nausea and vomiting are the usual result. Among people who went to the emergency department with symptoms after taking more than the recommended dose, 92% had nausea and 76% had vomiting. If you can't keep fluids down, go.

• Low blood sugar can happen even if you don't have diabetes. The Zepbound label links low blood sugar to tirzepatide and GLP-1 drugs in adults without type 2 diabetes. Watch for shakiness, sweating, dizziness, hunger, a fast heartbeat, confusion, blurred vision, weakness or feeling jittery.

• Low blood sugar showed up more often than expected. In the emergency department study, 9% of people had low blood sugar even though they weren't taking other blood-sugar-lowering medicines. Earlier reports had put it at 2.4% to 4.4%. Your risk is higher if you also take insulin or a sulfonylurea.

• Severe stomach pain that won't go away needs help right away. Pain like this can happen with or without vomiting and is sometimes felt from your belly through to your back. It can be a sign of an inflamed pancreas (pancreatitis). The Zepbound Medication Guide says to stop the medicine and call your healthcare provider right away.

• Trust what your body tells you early. One person on Zepbound made two ER trips in three weeks on the lowest dose, 2.5 mg, from side effects alone. That was not an overdose. Their advice: "Listen to your body while it whispers, before it starts to yell."

How long do side effects last after an accidental double dose?

Mild stomach symptoms often clear within a day. The drug itself stays in your body much longer, so your clinical team or Poison Help may want you watched for a few days.

How often does a double dose turn serious?

Not often, and you're far from the only one this has happened to. Of 1,047 GLP-1 cases reported to California Poison Control between 2017 and 2023, 80% were accidental. The most common mistake was taking a dose twice (313 cases, 29.9%). Next came misreading the syringe or pen and taking doses too close together, such as daily instead of weekly.

Most of those calls ended mildly. In 57.2%, minimal effects were expected, 24.0% had minor effects and 5.0% had none. Moderate outcomes made up 6.9% and major outcomes 0.5%. No one died.

That's why the call matters even when you feel OK. Poison Help can tell you what to watch for over the next few days, and the ER is there if low blood sugar, nonstop vomiting or severe pain shows up.

How do I avoid double dosing my GLP-1 shot?

• Write down each shot the moment you take it, with the date and the dose. Forgetting you already injected and doing it again is the single most common mistake in the California poison center data.

• If you use a vial, use a syringe sized for your dose and a new syringe and needle every time. The Zepbound label gives the example of a 1 mL syringe that can measure a 0.5 mL or 0.6 mL dose. Know whether your dose is written in milligrams, milliliters or units.

• If the dose in units confuses you, ask before you inject. The FDA saw patients told to give 5 units (0.05 mL) on a U-100 syringe give 50 units instead, and a provider prescribe 20 units instead of 2.

• If you need to change your tirzepatide day, keep at least 3 days (72 hours) between shots, as the Zepbound label says.

If you want a semaglutide or tirzepatide plan where your dose is set by a clinical team you can ask when something feels off, take the quiz to start with our clinical team.