Tirzepatide Dosage: Zepbound and Mounjaro Dosage Chart, Schedule and Missed Doses
Medically reviewed by Sabeen Munib M.D.The tirzepatide dosage for both Zepbound and Mounjaro starts at 2.5 mg injected once a week for 4 weeks, then rises in 2.5 mg steps, with at least 4 weeks at each step, to a maintenance dose. The highest dose is 15 mg once a week. For weight loss the usual maintenance dose is 5 mg, 10 mg or 15 mg, and your doctor picks the lowest dose that works and that you tolerate.
What is tirzepatide?
Tirzepatide is a once-weekly injection made by Eli Lilly. It is sold under two brand names: Zepbound for weight loss and Mounjaro for type 2 diabetes. Both contain the same medicine, use the same dose steps and come in the same strengths. What differs is the approved use.
Tirzepatide acts on two gut hormone receptors at once: GIP (glucose-dependent insulinotropic polypeptide) and GLP-1. That is why it is often called a dual GIP and GLP-1 receptor agonist. It slows how fast the stomach empties, turns down hunger signals and, in people with diabetes, lowers blood sugar after meals.
- Zepbound tirzepatide: approved, with a reduced-calorie diet and more physical activity, to reduce body weight and keep it off long term in adults with obesity, or adults with overweight and at least one weight-related condition. It is also approved to treat moderate to severe obstructive sleep apnea (OSA) in adults with obesity.
- Mounjaro tirzepatide: approved, with diet and exercise, to improve blood sugar control in adults and children 10 years and older with type 2 diabetes, and to lower the risk of heart attack, stroke and heart-related death in adults with type 2 diabetes who are at high risk.
The labels say not to use tirzepatide together with any other tirzepatide product or any GLP-1 medicine such as Wegovy or Ozempic.
What is the tirzepatide dosage schedule?
The starting tirzepatide dose is 2.5 mg injected under the skin once a week for 4 weeks. After that, the dose goes up in 2.5 mg steps, with at least 4 weeks at each step, until you reach a maintenance dose that works for you. The highest dose is 15 mg once a week.
The 2.5 mg dose is only a starting dose. Its job is to let your stomach adjust. It is not meant as a long-term dose.
Tirzepatide dosage chart
This chart shows the earliest point you could reach each dose if every step is raised on time. Many people stay longer at a step, and many never need the top dose.
- Weeks 1 to 4: 2.5 mg once weekly (starting dose)
- Weeks 5 to 8: 5 mg once weekly (first possible maintenance dose)
- Weeks 9 to 12: 7.5 mg once weekly
- Weeks 13 to 16: 10 mg once weekly
- Weeks 17 to 20: 12.5 mg once weekly
- Week 21 onward: 15 mg once weekly (maximum dose)
What is the maintenance dose of tirzepatide?
The maintenance dose depends on the reason you take it and how you respond.
- Zepbound for weight loss: 5 mg, 10 mg or 15 mg once weekly.
- Zepbound for obstructive sleep apnea: 10 mg or 15 mg once weekly.
- Mounjaro for type 2 diabetes: the dose is raised only if more blood sugar control is needed, up to 15 mg weekly in adults and 10 mg weekly in children 10 and older.
The label tells your doctor to weigh both treatment response and tolerability when choosing a maintenance dose. If a dose causes side effects you cannot live with, a lower maintenance dose is an option.
Why does the tirzepatide dose increase slowly?
The slow climb is there to lower the risk of stomach side effects. Nausea, vomiting and diarrhea are most likely early on and right after each dose increase. Giving your body at least 4 weeks at each step lets most people adjust before moving up.
A higher dose is not automatically better. If you are losing weight steadily, sleeping better or meeting your blood sugar goals on a lower dose, there may be no reason to change. A dose change is a decision you make with your doctor, based on how you are doing.
How do you know if your tirzepatide dose is too high?
A dose may be too high for you if side effects keep you from eating or drinking normally. Signs to report to your doctor include:
- Nausea or vomiting that lasts more than a few days after a dose change
- Not being able to eat enough protein or drink enough fluids
- Feeling dizzy, weak or lightheaded, which may signal dehydration
- Constipation or reflux that does not settle
The fix is often simple: stay at the current dose longer, or step back to the previous dose that you tolerated. Do not skip doses or split doses on your own to manage side effects. Talk with your doctor first so the plan stays safe.
How do you take a tirzepatide injection?
Tirzepatide is injected under the skin once a week, on the same day each week, at any time of day, with or without food.
- 1.Pick a weekly day that is easy to remember, such as Sunday morning.
- 2.Check the medicine. It should look clear and colorless to slightly yellow. Do not use it if it is cloudy, discolored or has particles.
- 3.Inject into the stomach area or thigh. Someone else can inject into the back of your upper arm.
- 4.Rotate the spot each week.
- 5.If you also use insulin, give it as a separate injection and never mix the two in one syringe.
Your care team will show you how to use the exact form you are prescribed before your first dose.
Zepbound pens, KwikPens and vials
Zepbound and Mounjaro both come in the same six strengths: 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg and 15 mg. The FDA label lists these forms:
- Single-dose pen: a prefilled autoinjector with one weekly dose. You use it once and throw it away.
- Single-patient-use KwikPen: one pen that holds four weekly doses, about a month of treatment. Never share a KwikPen, even with a new needle.
- Single-dose vial: one 0.5 mL dose drawn up with a new syringe and needle each week.
- Multi-dose vial: four 0.6 mL weekly doses in one vial.
For Zepbound, Lilly sells the vials and KwikPens through its LillyDirect self-pay pharmacy with a valid prescription. The single-dose pens are filled at regular pharmacies and may be covered by insurance. If you use a vial, the label calls for a 1 mL syringe that can measure the 0.5 mL or 0.6 mL dose, with a new syringe and needle every time.
Storage: keep pens and vials in the refrigerator and never freeze them. A single-dose pen or vial can stay unrefrigerated up to 86°F for a total of 21 days. A KwikPen or multi-dose vial must be thrown away 30 days after first use or after four doses, even if some medicine is left.
What if you miss a dose of tirzepatide?
If you miss a dose, take it as soon as you can within 4 days (96 hours) of the missed dose. If more than 4 days have passed, skip it and take your next dose on your regularly scheduled day. Then carry on with your usual weekly schedule.
- Never take two doses to make up for a missed one.
- You can change your injection day if you need to, as long as there are at least 3 days (72 hours) between two doses.
- If you have missed several doses in a row, call your doctor before restarting. Jumping back in at a high dose can bring back strong stomach side effects, so your doctor may restart you lower.
Does tirzepatide affect birth control pills?
Yes, for a short time. Tirzepatide slows stomach emptying, which may lower how well birth control pills are absorbed. The effect is largest after the first dose and fades over time.
The Zepbound and Mounjaro labels advise women using oral birth control to either switch to a non-oral method or add a barrier method, such as condoms, for 4 weeks after starting tirzepatide and for 4 weeks after each dose increase. Birth control that is not taken by mouth, such as an IUD, implant, patch or ring, should not be affected.
Tirzepatide may cause harm to an unborn baby. If you become pregnant, stop it and tell your doctor. Talk with your doctor before starting if you are planning a pregnancy.
What are the side effects of tirzepatide?
The most common side effects of tirzepatide involve the stomach, and they are usually worst early on and after each dose increase. Common side effects on the Zepbound label include:
- Nausea, vomiting, diarrhea or constipation
- Stomach pain, indigestion, burping or acid reflux
- Reactions at the injection site
- Tiredness
- Allergic-type reactions
- Hair loss
Practical habits that may ease stomach upset: eat smaller meals, stop when you feel full, limit greasy and very sweet food, and drink enough water through the day.
Serious risks and the boxed warning
Tirzepatide carries a boxed warning, the FDA's strongest label warning. In rats, tirzepatide caused thyroid C-cell tumors. It is not known whether it causes these tumors, including medullary thyroid cancer, in people.
Other serious problems on the label are uncommon but important:
- Pancreatitis
- Gallbladder problems, including gallstones
- Kidney problems from dehydration when vomiting or diarrhea is severe
- Serious allergic reactions, including swelling of the face or throat
- Low blood sugar when taken with insulin or a sulfonylurea
- Worsening of diabetic eye disease in people with type 2 diabetes and retinopathy
- Risk of breathing in stomach contents during anesthesia or deep sedation, so tell any surgeon or procedure team that you take it
Who should not take tirzepatide?
- Anyone with a personal or family history of medullary thyroid cancer, or with multiple endocrine neoplasia syndrome type 2 (MEN 2)
- Anyone who has had a serious allergic reaction to tirzepatide or its ingredients
- People with severe gastroparesis, where the label does not recommend it
- Women who are pregnant
How long does tirzepatide take to work?
Many people notice less hunger soon after starting, but tirzepatide works gradually. Most people do not reach a maintenance dose for at least two months, and weight loss usually continues over many months. How much weight you lose depends on your starting point, your dose, your sleep, your eating habits and how well you tolerate the medicine.
Read how long Mounjaro takes to work
Protein at each meal and strength training two or three times a week may protect muscle while you lose body weight.
How much does tirzepatide cost?
The cost of tirzepatide depends on the brand, the form and your insurance. There is no single price for everyone.
- Insurance: Mounjaro is often covered for type 2 diabetes. Coverage for Zepbound varies a lot. Many plans require prior authorization, and some exclude weight-loss medicines.
- Self-pay: Lilly offers Zepbound vials and KwikPens through LillyDirect at self-pay prices that vary by dose. Prices change, so check the current offer before you fill.
- HSA and FSA funds can usually be used for a prescription medicine.
At The Pur Health, the visit and the medicine are separate costs. Dr. Munib reviews your coverage and options at your appointment.
Zepbound vs Mounjaro: is the dose different?
No. Zepbound and Mounjaro use the same starting dose, the same 2.5 mg steps and the same 15 mg maximum. They are the same medicine with different approved uses, so which one you are prescribed usually depends on whether you have type 2 diabetes and what your insurance covers.
If you are comparing tirzepatide with semaglutide, the medicine in Wegovy and Ozempic, we explain the differences in a separate guide.
Read semaglutide vs tirzepatide: Ozempic vs Zepbound
Read the full Zepbound vs Mounjaro comparison
How Dr. Munib approaches tirzepatide dosing
The Pur Health prescribes brand-name GLP-1 medicines only: Zepbound, Mounjaro, Wegovy and Ozempic. Compounded tirzepatide is not prescribed here.
A first visit may include your weight history, blood pressure, current medicines, birth control, thyroid and family history, and labs such as A1C where they are useful. If tirzepatide fits, Dr. Munib may start at 2.5 mg and plan follow-up visits to check side effects, blood sugar where relevant and progress before each dose change. The goal is the lowest dose that works for you, not the highest dose on the chart.
Learn about Zepbound at The Pur Health
See all weight loss options at The Pur Health
When should you call a doctor?
- Severe stomach pain that does not go away, with or without vomiting, especially pain that spreads to the back
- Vomiting or diarrhea you cannot keep up with, or signs of dehydration such as dizziness or very little urine
- Pain in the upper right belly, fever, or yellowing of the skin or eyes
- A lump or swelling in the neck, trouble swallowing or a hoarse voice that does not go away
- Swelling of the face, lips or throat, or trouble breathing
- Shakiness, sweating or confusion if you also take insulin or a sulfonylurea
Book a visit in Irvine
If you are thinking about tirzepatide, or you are already on it and unsure about your next dose, a visit is the place to start. This article is general information, not medical advice for your own situation. The Pur Health is in-network with most PPO plans. Cash visits are $190 for new patients and $150 for returning patients. We are at 114 Pacifica, Suite 280, Irvine, CA 92618, and you can call (949) 647-5234.