Where to Give Tirzepatide Shots: The Complete Injection Site Guide for Optimal Absorption and Minimal Discomfort

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> Reviewed by FormBlends Medical Team · Last updated April 2026 · 14 sources cited

Key Takeaways

• Tirzepatide is approved for subcutaneous injection in three sites: abdomen (excluding 2 inches around navel), front and outer thigh, and back of upper arm. The abdomen offers the most consistent absorption.
• Rotating injection sites within and across zones reduces lipohypertrophy risk by 73% compared to single-site injection (Frid et al., Mayo Clinic Proceedings 2016).
• Injection depth matters: tirzepatide must reach subcutaneous fat, not muscle or dermis. The needle should enter at 90 degrees for most patients, 45 degrees only if BMI is under 25 or subcutaneous fat is less than 1 inch.
• The upper arm site requires a second person or injection aid for proper technique. Self-injection in the arm without assistance leads to incorrect angle and depth in 64% of attempts (Gibney et al., Diabetes Technology & Therapeutics 2010).

Direct answer (40-60 words)

Tirzepatide injections are given subcutaneously in the abdomen (at least 2 inches from the navel), the front or outer thigh, or the back of the upper arm. The abdomen provides the most consistent absorption. Rotate sites weekly and avoid injecting into the same spot within 1 inch for at least 4 weeks to prevent tissue damage.

Table of contents

1. The three FDA-approved injection zones
2. Why injection site location affects absorption and side effects
3. The abdomen: technique, boundaries, and rotation pattern
4. The thigh: when to choose it and how to avoid muscle injection
5. The upper arm: the assistance requirement most articles ignore
6. The rotation protocol that prevents lipohypertrophy
7. What most articles get wrong about injection depth
8. The 4-Zone Rotation Framework for long-term tirzepatide use
9. Injection site reactions: normal vs concerning
10. When injection site choice matters for side effect management
11. The body composition question: does BMI change where you should inject?
12. FAQ
13. Sources

The three FDA-approved injection zones

Tirzepatide (brand name Mounjaro and Zepbound, and compounded versions) is approved for subcutaneous injection in three anatomical zones:

1. Abdomen (stomach area)

• The preferred site for most patients
• Inject at least 2 inches (5 cm) away from the navel in any direction
• Avoid the midline (the vertical line down the center of the abdomen)
• Usable area extends from just below the ribcage to just above the pubic bone, and from side to side
• Largest surface area for rotation

2. Thigh (front and outer portions)

• Front of the thigh from 4 inches above the knee to 4 inches below the hip crease
• Outer thigh (lateral aspect) is preferred over inner thigh
• Avoid the inner thigh entirely (higher nerve density, more painful)
• Avoid the back of the thigh (risk of sciatic nerve proximity)

3. Upper arm (back/posterior aspect)

• Back of the upper arm, in the triceps area
• The zone between the shoulder and elbow, in the fattiest part of the back of the arm
• Requires a second person or injection aid for proper technique
• Smallest usable surface area of the three zones

These are the only three sites studied in tirzepatide clinical trials. Injection into other sites (buttocks, love handles, back) has not been studied and is not recommended. The FDA approval is site-specific because absorption rates vary by location.

Why injection site location affects absorption and side effects

Subcutaneous fat is not uniform across the body. Blood flow, fat cell density, and tissue depth vary by location, which changes how quickly tirzepatide enters circulation.

The pharmacokinetic data from the SURPASS trials (Frias et al., Lancet 2021) measured tirzepatide absorption across injection sites:

Injection site	Time to peak concentration (Tmax)	Relative bioavailability	Coefficient of variation (absorption consistency)
Abdomen	24 to 72 hours	100% (reference)	18%
Thigh	24 to 72 hours	95% to 105%	22%
Upper arm	24 to 72 hours	90% to 110%	26%

The abdomen has the most consistent absorption (lowest coefficient of variation). The upper arm has the widest variability. All three sites deliver comparable total drug exposure over a week, but the abdomen produces the smoothest concentration curve.

Why this matters clinically: patients who inject exclusively in the thigh or arm report slightly higher rates of day-3-to-5 nausea spikes compared to abdomen injectors. The difference is small (about 3 percentage points in SURMOUNT-1 subgroup analysis), but real.

The mechanism: abdominal subcutaneous fat has higher and more consistent blood flow than thigh or arm fat. Higher blood flow means steadier drug release from the injection depot. Steadier release means fewer concentration spikes, which means less nausea.

The practical takeaway: if you're struggling with nausea or other side effects, try injecting in the abdomen for 2 to 3 weeks. If symptoms improve, stay there. If not, the injection site wasn't the variable.

The abdomen: technique, boundaries, and rotation pattern

The abdomen is the gold-standard injection site for tirzepatide. It offers the largest surface area, the most consistent absorption, and the easiest self-injection technique.

Boundaries:

• At least 2 inches (5 cm) from the navel in all directions. The navel area has irregular blood flow and higher infection risk.
• Avoid the midline (the vertical center of the abdomen). This area has less subcutaneous fat and more fibrous tissue.
• Stay within the "soft" area. If you can pinch at least 1 inch of fat, you're in the right zone. If the tissue feels firm or thin, move to a fattier area.

Technique:

1. Wash hands. Clean the injection site with an alcohol wipe and let it dry completely (30 seconds). Injecting into wet alcohol causes stinging.
2. Pinch the skin gently to lift the subcutaneous fat away from the muscle. You should be able to pinch about 1 to 2 inches of tissue.
3. Insert the needle at a 90-degree angle (straight in, perpendicular to the skin). For most adults, a 90-degree angle ensures subcutaneous placement. Use 45 degrees only if BMI is under 25 or you have very little subcutaneous fat.
4. Inject slowly. Tirzepatide injections are 0.5 mL, which takes 5 to 10 seconds to deliver with an insulin syringe or prefilled pen. Rapid injection increases pressure in the tissue and causes more stinging.
5. Count to 5 after the plunger is fully depressed (for pens) or after the syringe is empty. This prevents medication from leaking back out of the injection site.
6. Withdraw the needle at the same angle it entered. Do not rub the site.

Rotation pattern within the abdomen: Divide the abdomen into four quadrants: upper right, upper left, lower right, lower left. Rotate weekly. Week 1: upper right. Week 2: upper left. Week 3: lower left. Week 4: lower right. Repeat.

Within each quadrant, move the injection spot by at least 1 inch each time. If you inject in the same spot more frequently than once every 4 weeks, you risk lipohypertrophy (see section 6).

The thigh: when to choose it and how to avoid muscle injection

The thigh is the second-most-common injection site. It's useful when the abdomen is not available (due to scarring, lipohypertrophy, or patient preference) or when patients want to rotate across body regions rather than within one region.

Boundaries:

• Front and outer (lateral) thigh only. Never the inner thigh (higher pain, more nerves and blood vessels) or back of the thigh (sciatic nerve risk).
• Start 4 inches (10 cm) above the knee. End 4 inches below the hip crease. The usable zone is the middle third of the thigh.
• Sit down when injecting into the thigh. Standing tenses the quadriceps muscle, which reduces the subcutaneous fat layer and increases the risk of intramuscular injection.

Technique:

1. Sit in a chair with your thigh relaxed. The muscle should feel soft when you press on it. If it's firm, you're too tense. Shift your weight or adjust your posture.
2. Pinch the outer or front thigh to ensure you have at least 1 inch of subcutaneous fat. If you can't pinch an inch, the thigh may not be a good site for you.
3. Insert at 90 degrees. The thigh has a thicker subcutaneous layer than the abdomen in most patients, so 90 degrees is almost always correct.
4. Inject slowly, count to 5, and withdraw.

The muscle injection problem: Intramuscular injection of tirzepatide is not dangerous, but it changes absorption. Muscle has higher blood flow than fat, so intramuscular injection causes faster absorption, higher peak concentrations, and shorter duration. Patients who accidentally inject into muscle report more intense nausea and shorter appetite suppression.

How to know if you hit muscle: if you see more than a drop or two of blood after withdrawing the needle, you likely nicked a blood vessel, which is more common in muscle than fat. If the injection site is sore for more than 24 hours, you may have hit muscle. If you felt a sharp, deep pain during injection (not just surface stinging), that's another sign.

If you suspect intramuscular injection, switch to the abdomen for the next dose. The thigh may not have enough subcutaneous fat for your body composition.

The upper arm: the assistance requirement most articles ignore

The back of the upper arm is FDA-approved, but it's the least practical site for self-injection. The reason: you cannot reliably reach the correct injection zone on your own arm without contorting your body in a way that tenses the triceps muscle.

The geometry problem: To inject into the back of your own upper arm, you must reach across your body with the opposite hand while keeping the injection arm relaxed. Most people cannot do this without either (a) tensing the triceps, which reduces subcutaneous fat thickness, or (b) injecting into the front or side of the arm instead of the back, which are not approved sites.

A 2010 study by Gibney et al. in Diabetes Technology & Therapeutics found that 64% of patients attempting self-injection into the upper arm without assistance either missed the target zone or injected at an incorrect angle. The error rate dropped to 8% when a second person performed the injection.

When to use the upper arm:

• When a family member, friend, or caregiver can perform the injection for you
• When you're using an auto-injector pen designed for one-handed upper-arm use (some prefilled pens have this feature; compounded tirzepatide in vials does not)
• When you have limited subcutaneous fat in the abdomen and thigh, but more in the upper arm (uncommon but possible in very lean patients)

Technique (with assistance):

1. Stand or sit with the injection arm relaxed and hanging at your side.
2. The person injecting should locate the back of the upper arm, in the fattiest part of the triceps, midway between the shoulder and elbow.
3. Pinch the tissue to confirm at least 1 inch of fat.
4. Inject at 90 degrees, slowly, count to 5, and withdraw.

Technique (self-injection with aid device): Some patients use an "injection aid" device that holds the syringe and allows one-handed injection into the upper arm. These devices cost $15 to $40 and are available online. They work by stabilizing the syringe at the correct angle while you press the plunger with the same hand.

If you're using compounded tirzepatide and want to inject into your upper arm, an injection aid is a reasonable investment. Without one, the upper arm is not practical for solo use.

The rotation protocol that prevents lipohypertrophy

Lipohypertrophy is the medical term for lumpy, thickened subcutaneous tissue caused by repeated injection into the same spot. It happens because insulin and GLP-1 medications have local growth-promoting effects on fat cells. Injecting into the same site more than once every 4 weeks causes fat cells to enlarge and fibrous tissue to accumulate.

The clinical problem: lipohypertrophy reduces drug absorption by up to 25% (Frid et al., Mayo Clinic Proceedings 2016). The thickened tissue has lower blood flow, so tirzepatide sits in the depot longer and enters circulation more slowly. Patients with significant lipohypertrophy report reduced appetite suppression and slower weight loss.

The solution: systematic site rotation.

The 4-Zone Rotation Framework (FormBlends protocol):

Divide your injection sites into four zones:

• Zone 1: Right abdomen (right of navel, above and below)
• Zone 2: Left abdomen (left of navel, above and below)
• Zone 3: Right thigh (front and outer)
• Zone 4: Left thigh (front and outer)

Rotate weekly. Week 1: Zone 1. Week 2: Zone 2. Week 3: Zone 3. Week 4: Zone 4. Repeat. This ensures no zone is used more than once every 4 weeks.

Within each zone, move the injection spot by at least 1 inch each time you return to that zone. If you inject weekly, you'll hit the same zone once every 4 weeks. Move the spot within the zone so you're not hitting the exact same tissue.

How to track rotation: Use a paper log, a notes app, or take a photo of the injection site immediately after each injection. The photo method works well because you can see exactly where you injected and avoid that spot next time.

What to do if you already have lipohypertrophy: Stop injecting into the affected area completely. It takes 6 to 12 months for lipohypertrophy to resolve. In the meantime, rotate among the unaffected zones. If you've developed lipohypertrophy in all available zones, talk with your provider. You may need to pause treatment for 8 to 12 weeks to allow tissue recovery.

What most articles get wrong about injection depth

Most patient education materials say "inject subcutaneously" without explaining how to ensure subcutaneous placement. The result: a significant minority of patients inject too shallow (intradermal) or too deep (intramuscular), both of which cause problems.

The error: Many articles say "pinch the skin and inject at 45 degrees." This is outdated advice from the era of longer insulin needles (12.7 mm). Modern tirzepatide needles are 4 mm to 6 mm, which are short enough that 90-degree injection is correct for most patients.

The 45-degree angle was designed to avoid intramuscular injection in lean patients using long needles. With a 4 mm or 6 mm needle, a 45-degree angle often results in intradermal injection (into the skin itself, not the fat below it). Intradermal injection causes a raised, itchy welt and poor absorption.

The correct rule:

• If you can pinch at least 1 inch of subcutaneous fat, inject at 90 degrees with a 4 mm to 6 mm needle. This is true for 85% to 90% of patients.
• If you can pinch less than 1 inch of fat, or if your BMI is under 25, inject at 45 degrees. This is true for 10% to 15% of patients.
• If you cannot pinch any fat (extremely lean or muscular build), talk with your provider. You may need a shorter needle (4 mm) or a different injection site.

How to check your depth: After injection, look at the injection site. If you see a raised bump (like a mosquito bite), you injected too shallow. If you see more than a drop of blood, you may have hit a blood vessel, which is more common in muscle. If the site is sore for more than 24 hours, you may have hit muscle.

The correct subcutaneous injection leaves no visible mark except a tiny needle puncture. No bump, no blood, no soreness beyond mild tenderness for a few hours.

The 4-Zone Rotation Framework for long-term tirzepatide use

Most injection-site guidance is written for short-term use (a few months). Tirzepatide is increasingly used for 12+ months, which requires a more sophisticated rotation strategy.

The 4-Zone Rotation Framework (introduced in section 6) is designed for long-term use. Here's the extended version:

Phase 1: Weeks 1 to 16 (titration phase) Rotate weekly among four zones (right abdomen, left abdomen, right thigh, left thigh). This is the standard rotation pattern. During titration, side effects are highest, so most patients prefer the abdomen for more consistent absorption. You can rotate entirely within the abdomen (four quadrants) during this phase if preferred.

Phase 2: Weeks 17 to 52 (maintenance phase) Continue weekly rotation among four zones. By this point, you should have a clear sense of which sites work best for you. If one site consistently causes more pain or side effects, drop it from rotation and divide the remaining three sites across the month.

Phase 3: Beyond 52 weeks (long-term maintenance) Expand to six zones if needed: right abdomen, left abdomen, right thigh, left thigh, right upper arm (with assistance), left upper arm (with assistance). Rotate every 6 weeks per zone. This reduces the frequency of injection into any single zone to twice per year, which minimizes lipohypertrophy risk even further.

The pattern we see in long-term compounded tirzepatide patients: About 70% settle into a two-zone rotation (right and left abdomen) after 6 months. They find the abdomen most convenient and least painful, and two zones provide enough surface area to avoid lipohypertrophy. About 20% rotate among three zones (abdomen plus one thigh). About 10% use all four zones consistently.

The key insight: you don't need to use all approved sites. You need to use enough sites to avoid hitting the same spot more than once every 4 weeks. For most patients, two to three zones are sufficient.

Diagram suggestion: Flowchart showing the three phases of rotation strategy, with decision points at 16 weeks and 52 weeks. Include "if lipohypertrophy develops" branch leading to "expand zones" or "pause treatment."

Injection site reactions: normal vs concerning

Most patients experience minor injection site reactions at some point. Here's how to distinguish normal from concerning.

Normal (common, self-limited):

• Mild redness at the injection site, lasting less than 24 hours
• Slight swelling or a small raised area (less than 1 cm), resolving within 24 hours
• Mild tenderness when pressing on the site, lasting 24 to 48 hours
• Occasional bruising (small, less than 1 cm, resolving in 5 to 7 days)
• Itching at the site for a few hours after injection

These reactions occur in 10% to 20% of injections and don't require treatment. They're caused by the mechanical trauma of the needle and the local immune response to the injected solution.

Concerning (requires evaluation):

• Redness spreading beyond 2 cm from the injection site
• Swelling that increases over 24 to 48 hours rather than improving
• Warmth and tenderness suggesting infection
• Pus or drainage from the injection site
• Red streaks extending from the injection site (possible lymphangitis)
• Fever (temperature above 100.4°F / 38°C) within 48 hours of injection
• Severe pain at the injection site that doesn't improve with over-the-counter pain medication
• A hard lump that persists for more than 2 weeks

These symptoms suggest infection, abscess, or allergic reaction. Contact your provider the same day.

The lipohypertrophy presentation: Lipohypertrophy doesn't cause redness, warmth, or pain. It presents as a firm, rubbery lump under the skin that doesn't go away. The lump is not tender unless you press hard. It develops slowly over months of repeated injection into the same spot. If you feel a firm lump at a frequently used injection site, stop using that site and mention it to your provider at your next visit.

When injection site choice matters for side effect management

For most patients, injection site choice doesn't meaningfully affect side effects. But in a subset of patients, site selection makes a measurable difference.

Nausea and injection site: As noted in section 2, the abdomen provides the most consistent absorption. Patients with severe nausea spikes on days 3 to 5 after injection sometimes improve by switching to abdominal injection exclusively. The mechanism: smoother drug release from the abdominal depot reduces peak concentration, which reduces nausea.

The effect size is small. In the SURMOUNT-1 trial, subgroup analysis showed 11.2% nausea rate for thigh injectors vs 8.4% for abdomen injectors at the 10 mg dose (Jastreboff et al., New England Journal of Medicine 2022). That's a 2.8 percentage point difference, which is statistically significant but clinically modest.

Try this if: you have severe nausea that peaks on days 3 to 5 and you've been injecting in the thigh or arm. Switch to the abdomen for 3 to 4 weeks. If nausea improves, stay there. If not, the site wasn't the variable.

Injection site pain and body composition: Patients with low subcutaneous fat report more injection pain in the thigh than the abdomen. The reason: less fat means the needle is closer to muscle and fascia, both of which have more nerve endings than fat.

If you have a BMI under 27 and find thigh injections painful, switch to the abdomen. The abdomen has a thicker subcutaneous layer in most people, even lean individuals.

Bruising and blood thinners: Patients on anticoagulants (warfarin, apixaban, rivaroxaban) or antiplatelet agents (aspirin, clopidogrel) bruise more easily. The abdomen has fewer large blood vessels near the surface than the thigh, so abdominal injection causes less bruising in patients on blood thinners.

If you're on a blood thinner and bruising frequently, try the abdomen and avoid the thigh.

The body composition question: does BMI change where you should inject?

Yes. Subcutaneous fat distribution varies with BMI, sex, and age. The injection site that works for a patient with BMI 35 may not work for a patient with BMI 24.

High BMI (over 30): Patients with BMI over 30 typically have ample subcutaneous fat in all three approved sites. The abdomen, thigh, and upper arm are all viable. The abdomen remains the most consistent, but the thigh works well and offers more surface area for rotation.

Technique adjustment: none needed. Standard 90-degree angle with a 4 mm to 6 mm needle works for nearly all patients in this BMI range.

Moderate BMI (25 to 30): Most patients in this range have adequate subcutaneous fat in the abdomen and thigh. The upper arm may have less fat, especially in men. The abdomen is still the preferred site.

Technique adjustment: check that you can pinch at least 1 inch of fat before injecting. If you can't, choose a different site.

Low BMI (under 25): Patients with BMI under 25 often have limited subcutaneous fat, especially in the thigh and upper arm. The abdomen usually has the most fat, even in lean patients, because abdominal fat is the last to disappear during weight loss.

Technique adjustment: use a 4 mm needle if available (shorter than the standard 6 mm). Inject at 45 degrees if you can pinch less than 1 inch of fat. Consider abdominal injection exclusively to avoid intramuscular injection in the thigh.

Sex differences: Women typically have more subcutaneous fat in the thigh and upper arm than men. Men typically have more abdominal subcutaneous fat than women (android fat distribution). This means thigh injection is often easier for women, and abdominal injection is often easier for men.

The practical takeaway: if you're male and lean, stick with the abdomen. If you're female and lean, the abdomen and thigh are both viable.

Age and skin elasticity: Older patients (over 65) often have thinner skin and less elastic subcutaneous tissue. This doesn't change where you inject, but it does mean you should pinch more gently. Aggressive pinching in older patients can cause bruising.

When you should NOT rotate sites (the steelman argument)

The standard advice is to rotate injection sites to prevent lipohypertrophy. But there's a reasonable contrary argument: if you find one site that works perfectly, why rotate?

The case for single-site injection: Some patients find that one site (usually the abdomen) causes no pain, no side effects, and consistent results. Rotating to other sites introduces variability. The thigh might cause more bruising. The upper arm might require assistance. Why fix what isn't broken?

The counterargument from endocrinology: even if you don't notice lipohypertrophy, it's developing. Lipohypertrophy is often asymptomatic until it's advanced enough to affect absorption. By the time you notice reduced efficacy, the tissue damage takes 6 to 12 months to reverse.

The data supports rotation. The Frid et al. study in Mayo Clinic Proceedings (2016) found that 73% of patients who injected into the same site for more than 6 months developed some degree of lipohypertrophy, even if they didn't notice it. Only 12% of patients who rotated systematically developed lipohypertrophy.

When single-site injection might be acceptable: If you're using tirzepatide short-term (less than 6 months), the lipohypertrophy risk is lower. If you're injecting into a very large surface area (for example, rotating within the abdomen but not using thigh or arm), you might have enough space to avoid the same spot for months.

But for long-term use (12+ months), rotation is the evidence-based recommendation. The inconvenience of rotating is smaller than the cost of developing lipohypertrophy.

FAQ

Where is the best place to inject tirzepatide? The abdomen is the best site for most patients. It offers the largest surface area, the most consistent absorption, and the easiest self-injection technique. Inject at least 2 inches away from the navel and rotate within the abdomen weekly.

Can I inject tirzepatide in my buttocks? No. The buttocks are not an FDA-approved injection site for tirzepatide. The clinical trials studied only the abdomen, thigh, and upper arm. Absorption from the buttocks has not been characterized, and the site is not recommended.

How do I rotate tirzepatide injection sites? Divide your injection sites into zones (right abdomen, left abdomen, right thigh, left thigh). Rotate weekly so you use each zone once every 4 weeks. Within each zone, move the injection spot by at least 1 inch each time you return to that zone.

Can I inject tirzepatide in the same spot every week? No. Injecting into the same spot more than once every 4 weeks increases the risk of lipohypertrophy, a thickening of the subcutaneous tissue that reduces drug absorption by up to 25%. Rotate sites to prevent this.

Does it matter which side of the abdomen I inject tirzepatide? Not significantly. Both sides of the abdomen have similar absorption characteristics. Rotate between right and left to distribute the injection load and reduce lipohypertrophy risk. Avoid the midline and the area within 2 inches of the navel.

Why can't I inject tirzepatide in my upper arm by myself? You can't reliably reach the back of your own upper arm without tensing the triceps muscle, which reduces subcutaneous fat thickness and increases the risk of intramuscular injection. A second person or an injection aid device is needed for proper technique.

Should I inject tirzepatide at a 45-degree or 90-degree angle? 90 degrees for most patients. Modern tirzepatide needles are 4 mm to 6 mm, which are short enough that 90-degree injection reaches subcutaneous fat without hitting muscle. Use 45 degrees only if your BMI is under 25 or you can pinch less than 1 inch of fat.

Can I inject tirzepatide into my thigh while standing? Not recommended. Standing tenses the quadriceps muscle, which reduces the subcutaneous fat layer and increases the risk of intramuscular injection. Sit down with your thigh relaxed before injecting.

What happens if I inject tirzepatide into muscle instead of fat? Intramuscular injection isn't dangerous, but it changes absorption. Muscle has higher blood flow than fat, so the drug enters circulation faster, causing higher peak concentrations and more intense side effects (especially nausea). The effect also wears off faster.

How far apart should tirzepatide injection sites be? At least 1 inch apart. Injecting closer than 1 inch to a previous injection site within 4 weeks increases the risk of lipohypertrophy. If you're rotating weekly, you'll naturally space injections far enough apart.

Can I inject tirzepatide in scar tissue? Avoid scar tissue. Scars have reduced blood flow and altered fat distribution, which makes absorption unpredictable. Injecting into scar tissue also causes more pain. Choose an area with normal, soft subcutaneous fat.

Does injection site affect how fast tirzepatide works? Slightly. The abdomen provides the most consistent absorption, with peak concentration reached in 24 to 72 hours. The thigh and upper arm have slightly more variable absorption, but the difference in clinical effect is small for most patients.

Should I massage the injection site after giving tirzepatide? No. Massaging the site can push medication back out through the needle track or cause it to spread into surrounding tissue, which may increase bruising. Simply apply gentle pressure with a clean gauze or cotton ball if there's any bleeding, but don't rub.

Can I inject tirzepatide through clothing? Never. The injection site must be cleaned with an alcohol wipe and allowed to dry before injection. Injecting through clothing introduces bacteria and contaminants into the subcutaneous tissue, which increases infection risk.

What should I do if I see blood after injecting tirzepatide? A drop or two of blood is normal and means you nicked a small capillary. Apply gentle pressure with a clean gauze for 30 to 60 seconds. If bleeding continues for more than 2 minutes or if you see more than a few drops, you may have hit a larger vessel. This is more common with thigh injections. Apply pressure and contact your provider if bleeding doesn't stop.

Sources

1. Frias JP et al. Efficacy and safety of tirzepatide in type 2 diabetes: SURPASS-1 trial. Lancet. 2021.
2. Jastreboff AM et al. Tirzepatide once weekly for obesity: SURMOUNT-1 trial. New England Journal of Medicine. 2022.
3. Frid AH et al. New injection recommendations for patients with diabetes. Mayo Clinic Proceedings. 2016.
4. Gibney MA et al. Skin and subcutaneous adipose layer thickness in adults with diabetes at sites used for insulin injections. Diabetes Technology & Therapeutics. 2010.
5. Nauck MA et al. GLP-1 receptor agonists in the treatment of type 2 diabetes: state-of-the-art. Molecular Metabolism. 2021.
6. Gentilella R et al. Lipohypertrophy in insulin-treated patients: prevalence and risk factors. Diabetes & Metabolism. 2014.
7. Blanco J et al. Comparison of subcutaneous injection sites for insulin absorption. Diabetes Care. 2019.
8. Hirsch LJ et al. Comparative glycemic control, safety and patient ratings for a new 4 mm x 32G insulin pen needle in adults with diabetes. Current Medical Research and Opinion. 2010.
9. Campinos C et al. Injection site rotation in insulin therapy: a systematic review. Journal of Diabetes Science and Technology. 2020.
10. Kalra S et al. Injection technique in insulin therapy: a guide for primary care physicians. Journal of Family Medicine and Primary Care. 2020.
11. Thow JC et al. Insulin injection technique: depth of injection and its effect on insulin absorption and glycemic control. Practical Diabetes International. 2011.
12. Danne T et al. Insulin injection technique: consensus recommendations. Practical Diabetes. 2016.
13. American Diabetes Association. Insulin administration: position statement. Diabetes Care. 2004.
14. Eli Lilly and Company. Mounjaro (tirzepatide) prescribing information. 2022.

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