Where to Inject Testosterone: Injection Sites by Product

Testosterone cypionate and testosterone enanthate in vials are labeled for intramuscular use, and their FDA prescribing information names one site: deep in the gluteal (buttock) muscle. Xyosted, the testosterone injection the FDA approved for use under the skin, goes in the left or right side of the abdomen, never within 2 inches of the belly button. Sites you see elsewhere online, such as the thigh or shoulder, aren't named on these labels, so a site other than the label's is something your prescriber decides and shows you in person.

Med Matrix is a TRT clinic offering testosterone replacement therapy for Maine and New Hampshire men. This post sticks to what the FDA labels and patient Instructions for Use actually say, product by product, with a link to each one at the bottom. If you're still weighing whether treatment makes sense for you, our testosterone replacement therapy page covers how we evaluate low T first. This is general information, and it isn't a substitute for the instructions from whoever prescribed your testosterone.

Testosterone Injection Sites by Product

Injectable testosterone products aren't interchangeable, and the Azmiro label says so directly: they "may have different doses, strengths, or administration instructions." So the right answer to "where do I inject?" starts with which product is on your prescription. The table below summarizes the site each FDA label names.

Testosterone injection sites named in each product's FDA prescribing information or Instructions for Use

Product	Route on the label	Where the label says to inject	Label notes
Testosterone cypionate (Depo-Testosterone and generics)	Intramuscular	Deep in the gluteal muscle	"For intramuscular use only." Never into a vein. Warming and shaking the vial redissolves crystals.
Azmiro (testosterone cypionate)	Intramuscular	Deep gluteal muscle only	The prefilled syringe is given by a healthcare professional only.
Testosterone enanthate (vial)	Intramuscular	Slowly, deeply into the gluteal muscle	Avoid injecting into a blood vessel. Rare coughing reactions right after a shot have been reported.
Xyosted (testosterone enanthate auto-injector)	Subcutaneous	Left or right side of the abdomen, at least 2 inches from the navel	No other body area. Self-injected only after training.
Aveed (testosterone undecanoate)	Intramuscular	Gluteus medius, upper outer quarter of the buttock, alternating sides	Given only in a certified healthcare setting, with 30 minutes of observation after every shot.

Source: current FDA prescribing information and Instructions for Use for each product, read on DailyMed (US National Library of Medicine), November 3, 2026. Links are in the Sources list below.

Intramuscular Testosterone: Cypionate and Enanthate

Apart from Aveed (covered below), every testosterone vial listed on DailyMed holds one of two oil-based esters, cypionate or enanthate. Their labels are short on technique and specific about the site.

Testosterone cypionate

The Depo-Testosterone label reads: "DEPO-Testosterone Injection is for intramuscular use only. It should not be given intravenously. Intramuscular injections should be given deep in the gluteal muscle." The generic cypionate labels we checked on DailyMed carry the same sentence word for word.

One practical note from the same label. Cypionate can form crystals if it's stored too cold, and "warming and shaking the vial should redissolve any crystals." The label also tells whoever gives the shot to look at the liquid for particles or discoloration first.

Azmiro, a newer cypionate brand, adds a little more detail. Its label calls for "deep gluteal intramuscular injection only," cleaning the site with an alcohol swab and letting the skin dry, then inserting the needle straight in at a 90° angle. Its prefilled syringe "should be administered as an intramuscular injection by a healthcare professional only." In the trial behind the label, the most common reactions were injection site redness (26%) and other injection site reactions (4%), all rated mild.

Testosterone enanthate

The enanthate vial label is similar, with one extra instruction about speed: "Care should be taken to slowly inject the preparation deeply into the gluteal muscle, being sure to follow the usual precautions for intramuscular administration, such as the avoidance of intravascular injection." Crystals are handled by "warming and rotating the vial between the palms of the hands."

It also carries a warning worth knowing before your first shot. There have been "rare post-marketing reports of transient reactions involving urge to cough, coughing fits, and respiratory distress immediately after the injection." Tell your prescriber if that ever happens to you.

What about the thigh or shoulder?

Search this question and you'll find plenty of diagrams showing the outer thigh or the deltoid, some of them from clinics. Neither site appears on the cypionate or enanthate labels. A prescriber may still choose a different site for a reason specific to you, and that's their clinical call to make. But an instruction that departs from the label should come from them, in person, with someone watching your first attempt. A stranger's tutorial is a poor substitute.

Subcutaneous Testosterone: What the Xyosted Label Says

Xyosted is testosterone enanthate in a single-dose auto-injector, and it's the injectable testosterone on DailyMed whose label calls for use under the skin rather than into muscle. Its prescribing information is blunt about it: "XYOSTED is for subcutaneous injection in the abdominal region only. Avoid intramuscular or intravascular injection."

The patient Instructions for Use spell out the site:

• "Only use the left or right side of the abdomen (belly) for injection sites."
• Stay out of the area within 2 inches around the belly button.
• Skip skin that's tender, bruised, red, scaly or hard, and avoid scars, tattoos and stretch marks.
• "Do not inject XYOSTED in any other areas of the body."

And the technique, in order. Wash your hands, wipe the site with an alcohol swab, and let it dry on its own without fanning or blowing on it. Gently squeeze the skin into a raised area and hold it. Place the auto-injector straight at 90 degrees, push down firmly, and keep holding after the click while you slowly count to 10. The viewing window should turn orange, which confirms the dose went in. A little bleeding afterward is normal; press a cotton ball or gauze on it, and don't rub.

Two rules from the same leaflet matter more than any of the steps. You shouldn't inject Xyosted until you've been trained on it. And if you're not sure the dose went in, "do not inject another dose." Call your pharmacist or prescriber instead. Injection site bruising was among the most common reactions reported in the Xyosted trials.

You'll also see videos of cypionate injected under the skin. The cypionate labels don't describe that route; they say intramuscular only. If your prescriber recommends something different from the label, they should be the one to explain why and show you how.

Aveed: The Testosterone Shot That Never Happens at Home

Aveed (testosterone undecanoate) is a long-acting injection with the most detailed site instructions of any product here, because it carries a boxed warning. The label names "the gluteus medius muscle site located in the upper outer quadrant of the buttock," warns that "care must be taken to avoid the needle hitting the superior gluteal arteries and sciatic nerve," and says to alternate between the left and right buttock from one injection to the next. The plunger goes down slowly, over 60 to 90 seconds.

The warning is about pulmonary oil microembolism (POME) and anaphylaxis, with symptoms including "urge to cough, dyspnea, throat tightening, chest pain, dizziness, and syncope." Because of it, Aveed is only available through a restricted program, only certified healthcare settings can give it, and every patient is observed for 30 minutes after every injection. If you search for where to inject Aveed yourself, the label's answer is that you don't.

Where Not to Inject Testosterone

People ask this nearly as often as where to inject, and the labels answer it more clearly:

• Into a vein or blood vessel. The Depo-Testosterone, testosterone enanthate and Aveed labels all warn against intravenous or intravascular injection.
• Within 2 inches of the belly button, for Xyosted.
• Anywhere on the body other than the abdomen, for Xyosted.
• Skin that's bruised, red, scaly, hard or tender, or that has scars, tattoos or stretch marks (from the Xyosted instructions).
• Near the superior gluteal arteries or the sciatic nerve, which is why the Aveed label pins the site to the upper outer buttock.

Don't use the medicine at all if the liquid is cloudy or has visible particles. That instruction appears on the Xyosted leaflet, and the vial labels tell whoever is giving the shot to inspect it first.

Signs to Take Seriously After an Injection

Mild redness or bruising at the site is among the most common reactions on these labels. A few other signs are not routine:

• Coughing, trouble breathing, throat tightening or dizziness during or right after a shot. The enanthate and Aveed labels both describe this. Get medical help right away.
• Pain, swelling, warmth and redness in a leg, or sudden shortness of breath. Every testosterone label here asks prescribers to check those symptoms for a blood clot in the leg or lung.
• A dose you're not sure went in. Don't repeat it. Call.

Used needles and auto-injectors go in an FDA-cleared sharps container, not the household trash. The Xyosted leaflet points to the FDA's safe sharps disposal page for your state's rules.

The Site Matters Less Than the Monitoring

Men spend a lot of energy on which muscle to use. The labels spend far more words on blood work. The Xyosted label, for one, calls for checking hematocrit about every 3 months, because testosterone can raise red blood cell mass, and for checking PSA, lipids and blood pressure periodically. Our post on testosterone cypionate side effects covers why that thicker-blood risk is the one to watch.

That's where we put our attention. Every new patient gets an 80+ biomarker panel that includes total and free testosterone, SHBG, estradiol, PSA and a full CBC, and we retest and compare against your own baseline as treatment goes on. If you're wondering what a normal number even looks like, start with testosterone levels by age. And if you might want children later, read does TRT make you infertile before you start anything.

Frequently Asked Questions

Where is the best place to inject testosterone?

The site on your product's label. For testosterone cypionate and enanthate vials, that's deep in the gluteal muscle. For Xyosted, it's the left or right side of the abdomen, at least 2 inches from the navel. If your prescriber has given you a different site, follow their instructions and ask them why.

Can you inject testosterone cypionate subcutaneously?

The FDA labels for cypionate say "for intramuscular use only." The one injectable testosterone labeled for use under the skin is Xyosted, which is enanthate. Any change of route from the label is a decision for your prescriber, not something to try on your own.

Can I give myself an intramuscular testosterone shot?

It depends on the product and on your prescriber. The Azmiro prefilled syringe is labeled for a healthcare professional only, and Aveed is only given in a certified clinic. The Xyosted leaflet says not to self-inject until you've been trained. Whatever you're prescribed, the person prescribing it should show you, and watch you, before you do it alone.

Should I rotate testosterone injection sites?

The Aveed label alternates between the left and right buttock with each injection, and the Xyosted leaflet allows either side of the abdomen. The cypionate and enanthate vial labels don't set a rotation schedule, so ask your prescriber how they want you to switch sides.

Is it normal to bleed a little after a testosterone injection?

A small amount, yes. The Xyosted instructions call slight bleeding normal and say to hold a cotton ball or gauze on the spot for a few seconds without rubbing. Bleeding that doesn't stop with pressure, or any trouble breathing, is a reason to call.

Sources

1. DEPO-Testosterone (testosterone cypionate) injection, prescribing information. Pharmacia & Upjohn (Pfizer). DailyMed, US National Library of Medicine. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=cfbb53d4-b868-4a28-8436-f9112eb01c39. Accessed November 3, 2026.
2. AZMIRO (testosterone cypionate) injection, prescribing information. Azurity Pharmaceuticals. DailyMed. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=235b5625-570d-3fba-e063-6394a90aa2d1. Accessed November 3, 2026.
3. Testosterone enanthate injection, USP, prescribing information. Hikma Pharmaceuticals USA. DailyMed. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=e89d6458-428c-4256-97a3-f1fa851293c1. Accessed November 3, 2026.
4. XYOSTED (testosterone enanthate) injection, prescribing information and Instructions for Use. Antares Pharma. DailyMed. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=8a3d204c-be26-49e0-8599-0ac12a272e81. Accessed November 3, 2026.
5. AVEED (testosterone undecanoate) injection, prescribing information. Endo USA. DailyMed. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=f80f025b-17d8-40af-8739-20ce07902045. Accessed November 3, 2026.
6. Safely Using Sharps (Needles and Syringes) at Home, at Work and on Travel. US Food and Drug Administration. https://www.fda.gov/safesharpsdisposal. Accessed November 3, 2026.

Start Feeling Like Yourself Again

Where the needle goes is the last question in TRT, not the first. The first is whether low testosterone is really what's behind how you feel. It begins with a Free Discovery Call, then an 80+ Biomarker Test & Full Body Scan. Our Medical Team Reviews Everything, and a 60-Minute Provider Consultation goes through every result with you. Ongoing Support & Progress means we retest and compare against your own baseline. Labs can be drawn in our office, or at a partner lab near you. See how we approach testosterone replacement therapy and men's health.

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Med Matrix is a functional medicine clinic in South Portland, Maine, serving patients across Greater Portland and southern New Hampshire.