Feeling cold is not on the Zepbound or Mounjaro label's list of side effects, so there is no official rate for it. Plenty of people notice it anyway, and the reasons are not mysterious. You are eating far less, and digesting food makes heat. You are losing fat, which is insulation. And you may be drinking less, which makes cold hands and feet worse. Warm food, steady fluids and layers fix most of it. Cold with shaking, confusion or a fever is something else. Start with our tirzepatide guide if you are new to the drug.
Key takeaways
- Cold sensitivity, chills and cold hands and feet are not listed as adverse reactions on either label. Any percentage you see for it is not from the label or the trials in our sources.
- Eating much less means less heat from digestion. In SURMOUNT-1, adults on tirzepatide lost 15.0% to 20.9% of body weight over 72 weeks, and fat is insulation.
- Dehydration, which the label warns about, narrows blood flow to the hands and feet and makes them feel cold.
- Cold with shakiness and sweating in someone on insulin or a sulfonylurea can be low blood sugar, a label warning.
- Feeling cold on its own is not a reason to change your dose. Only your prescriber decides that.
Is being cold a side effect of Zepbound? What the label lists
| Symptom | On the Zepbound label? | Note |
|---|---|---|
| Feeling cold, cold hands and feet, chills | No | Not in Adverse Reactions or Warnings |
| Fatigue | Yes | Often travels with feeling cold; both track low intake |
| Nausea, vomiting, diarrhea | Yes | Drive fluid loss, which makes hands and feet cold |
| Hair loss | Yes | Like feeling cold, it tends to follow rapid weight loss |
| Low blood sugar with insulin or a sulfonylurea | Warning | Chills, shakiness and sweating are classic signs |
| Dehydration leading to kidney injury | Warning | Cold, clammy skin with dizziness is a sign of serious fluid loss |
Source: Zepbound and Mounjaro labels, Adverse Reactions and Warnings and Precautions sections (DailyMed).
Why does tirzepatide make you feel cold? Three plain reasons
None of these is a label finding. They are the plausible explanations, and they fit what the drug is known to do.
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Try the BMI Calculator →| Reason | How it works | What helps |
|---|---|---|
| Less food, less heat | Digesting a meal produces heat. Tirzepatide cuts appetite hard, so you may be running on far fewer calories than a month ago, and you feel it most between meals and at night. | Small regular meals with protein; warm food and drinks; do not skip meals |
| Less fat, less insulation | Body fat holds heat in. Losing a meaningful share of it, as SURMOUNT-1 participants did, changes how quickly you lose heat to the room. | Layers; warm socks; a warmer thermostat setting; this one does not go away, you adapt to it |
| Less fluid, colder hands and feet | Dehydration makes the body pull blood to the core. Fingers and toes go cold first. | Drink on a schedule; aim for pale yellow urine |
Source: SURMOUNT-1 (PubMed 35658024) for weight-loss magnitude; Zepbound label for the dehydration warning (DailyMed). Mechanisms are stated as possibilities.
How much weight loss are we talking about?
The insulation point is easier to picture with the trial numbers. SURMOUNT-1 followed 2,539 adults with obesity or overweight for 72 weeks.
| Group | Mean weight change at 72 weeks | Reached at least 20% loss |
|---|---|---|
| Placebo | -3.1% | 3% |
| Tirzepatide 5 mg | -15.0% | Not reported in our sources |
| Tirzepatide 10 mg | -19.5% | 50% |
| Tirzepatide 15 mg | -20.9% | 57% |
Source: SURMOUNT-1, Jastreboff et al., NEJM 2022 (PubMed 35658024), treatment-regimen estimand.
Half of the people on the higher doses lost a fifth of their body weight. Much of that is fat. Feeling colder after that kind of change is expected, and it is not a sign something is wrong.
What helps when you feel cold on tirzepatide
Eat on a schedule, not by hunger, because hunger is muted. Make at least one meal a day warm, and include protein at each one. Drink warm fluids: tea, broth and warm water count toward your fluid goal. Dress in layers and keep socks handy. Move: a short walk warms you faster than a blanket. Check your iron and thyroid at your next visit if cold is new and constant, because those causes do not go away when you start a new drug. And do not use feeling cold as a reason to skip or lower a dose. Tell your prescriber instead.
When feeling cold means call
| Cold plus | What it may mean | What to do |
|---|---|---|
| Shakiness, sweating, confusion (on insulin or a sulfonylurea) | Low blood sugar; label warning | Take fast sugar; call your prescriber |
| Cold clammy skin, dizziness, very little urine, after vomiting or diarrhea | Serious dehydration; label warning for acute kidney injury | Call your prescriber today; urgent care if you cannot keep fluids down |
| Fever and chills | Infection, not a drug effect | See a clinician; urgent if with back pain, stiff neck or confusion |
| Cold that is constant for weeks with hair loss, dry skin, constipation and tiredness | Could be thyroid; unrelated to the boxed warning | Ask your prescriber for a thyroid check |
| Fingers or toes turning white or blue | Circulation problem | Same-day care |
Source: Zepbound and Mounjaro labels, Warnings and Precautions section (DailyMed); other rows are general medical guidance.
What this means for compounded tirzepatide
Compounded tirzepatide is the same molecule and cuts appetite the same way, so the same reasoning applies. It is not FDA approved and is not interchangeable with Zepbound or Mounjaro. FormBlends prescriptions come from independent, state-licensed clinicians of Recess MD LLC. You can start an assessment or view pricing.
Frequently Asked Questions
Does tirzepatide make you cold?
Feeling cold is not on the label, so there is no official rate. Many people notice it, and eating much less, losing fat, and drinking less are the plausible reasons. Warm meals, steady fluids and layers help most.
Is being cold a side effect of Zepbound?
Not a listed one. The Zepbound label's common adverse reactions are gut symptoms, injection site reactions, fatigue, hypersensitivity reactions, burping, hair loss and reflux. Cold sensitivity is not among them.
Why does Zepbound make you feel cold at night?
Nights are when you have gone longest without food, so there is less heat from digestion, and you are still. With less fat for insulation, that adds up. A warm evening meal with protein and warmer bedding are the practical fixes.
Does feeling cold on tirzepatide go away?
The label gives no answer. The part driven by low intake and fluids improves when you eat and drink on a schedule. The part driven by less body fat does not reverse; most people adjust to it over time.
When should I worry about feeling cold?
Cold with shakiness and sweating on insulin or a sulfonylurea may be low blood sugar. Cold clammy skin with dizziness after vomiting or diarrhea may be serious dehydration. Fever with chills is likely infection. Each needs a call the same day.
Sources
- Zepbound (tirzepatide) prescribing information, DailyMed, Eli Lilly, revised 08/2026.
- Mounjaro (tirzepatide) prescribing information, DailyMed, Eli Lilly, revised 08/2026.
- Tirzepatide Once Weekly for the Treatment of Obesity (SURMOUNT-1), Jastreboff et al., New England Journal of Medicine, 2022.
Next steps
Read does tirzepatide make you tired, the tirzepatide diet plan, and the complete tirzepatide side effects guide. Browse the tirzepatide hub for every other tirzepatide question. Talk to a licensed clinician if cold is constant or comes with other symptoms. Compounded tirzepatide is not FDA approved and is not interchangeable with Zepbound or Mounjaro; a licensed provider decides whether it is appropriate for you.
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