Where to Inject Tesamorelin: Sites and Rotation

Tesamorelin Is a Subcutaneous Injection

Tesamorelin is a subcutaneous (subQ) injection. The needle enters the fat layer just beneath the skin, not muscle. This matters because tesamorelin is one of the few peptides in this space with an FDA approval behind it: it is approved under the brand name Egrifta for HIV-associated lipodystrophy, and that approved labeling specifies subcutaneous administration into the abdomen. When patients ask where to inject tesamorelin, the answer is not guesswork; it is written into the drug label.

If subQ injections are new to you, the how-to-inject-peptides guide walks through the general technique step by step, and what peptide therapy is covers the fundamentals. If you want the mechanism, dosing rationale, and clinical background on this specific peptide, the full tesamorelin guide is the deeper read. This page stays focused on one question: where the injection goes, and how to do it well.

The Abdomen Is the Standard Site

The abdomen is the primary tesamorelin injection site. Use the soft tissue between the lower rib cage and the hip bones, on either side of the belly button. Stay at least two inches away from the navel itself, and pick clean skin away from any scar, stretch mark, mole, tattoo, or visible vein.

The abdomen works well for three practical reasons. Fat coverage there is generally consistent, so the needle reliably lands in the subcutaneous layer rather than muscle. The area is easy to see, which makes self-injection and rotation straightforward. And absorption from abdominal subcutaneous tissue is predictable, which is exactly what you want from a once-daily peptide that depends on steady exposure.

Some patients ask whether the thigh or the back of the upper arm can substitute on a day the abdomen feels overused. In general practice those are recognized subcutaneous sites, but tesamorelin is different from a peptide like MOTS-c in that its approved labeling names the abdomen specifically. The cleaner approach is to keep all of your injections in the abdomen and simply rotate widely across it, rather than jumping to other body regions. If you have a reason the abdomen will not work for you, raise it with your provider rather than improvising.

Step by Step

The full subQ technique lives in the how-to-inject-peptides guide. Here is the short version as it applies to a tesamorelin dose from the refrigerator.

1. Take the vial out and let it warm briefly. Cold solution stings more going in. A minute or two out of the fridge takes the edge off. Do not heat it; room-temperature-ish is enough.

2. Wash your hands and wipe the vial stopper. Clean the rubber top with an alcohol swab and let it dry. Inspect the solution: it should be clear and colorless. If you see particles, cloudiness, or discoloration, do not use it.

3. Draw the prescribed dose. Pull air into the syringe equal to your dose, inject that air into the vial, invert, and draw your dose to the exact mark your provider prescribed. Tap out air bubbles and push them back up until only solution remains.

4. Pick and clean a fresh abdominal spot. At least two inches from the navel, at least one inch from your last injection. Wipe with alcohol and let it dry so it does not sting.

5. Pinch, insert, inject. Pinch a fold of skin and fat, insert the needle at 45 to 90 degrees depending on how much tissue you can gather, and push the plunger slowly and steadily. Slow injection is more comfortable than fast.

6. Withdraw and apply light pressure. Pull the needle straight out, release the pinch, and press gently with clean gauze. Do not rub. Dispose of the syringe in a sharps container; insulin syringes are single use.

Rotation and Lipohypertrophy

Rotation is the single most important habit for a daily injection, and it is why the approved labeling explicitly tells you to rotate. Injecting the same spot day after day causes lipohypertrophy: firm, thickened fatty tissue that builds up under the skin from repeated needle trauma. It is common with any daily subcutaneous medication, which is why the same warning appears on insulin instructions.

Lipohypertrophy is not only a cosmetic issue. Those firm areas absorb medication erratically, so a dose delivered into a built-up spot may take up more slowly or less completely than the same dose into healthy tissue. For a peptide you take every day and rely on for steady exposure, inconsistent absorption undercuts the whole point.

The rule providers teach is simple: move at least one inch, a finger-width, from your last injection point every time. Picture the abdomen as a grid of squares on each side of the navel and work through them in order before repeating any. A workable pattern is to alternate sides day to day and step down the grid each week, so no square gets hit again for many days. If you ever feel a firm lump forming, stop using that area entirely until it softens, and tell your provider.

Timing and Frequency

Tesamorelin is a once-daily injection. The most important variable is consistency: inject at roughly the same time every day so exposure stays even. Neither the approved labeling nor the pivotal clinical trials require a particular hour of the day.

Falutz J, Allas S, Blot K, et al. Metabolic effects of a growth hormone-releasing factor in patients with HIV. N Engl J Med. 2007;357(23):2359-2370. (Pivotal Phase 3 trial; once-daily subcutaneous tesamorelin.) View study

In practice, timing comes down to preference and provider guidance. Many patients inject in the morning, which is simple to build into a routine. Some prefer the evening on the reasoning that it aligns with the natural nocturnal growth hormone pulse. Both are reasonable, and the difference is small next to the value of taking it consistently. Follow the timing your provider prescribes rather than switching around week to week.

Dose and Volume Context

This is a where-and-how guide, not a dosing guide, but a little context helps you draw accurately. The FDA-approved reference dose for tesamorelin is 2 mg subcutaneously once daily, the dose used across the Phase 3 program. PeRx ships tesamorelin at 3 mg/mL, so a full 2 mg reference dose is a small, precise volume. Your actual dose, and the exact mark you draw to, is whatever your provider prescribes on your label. For the mechanism and full dosing rationale, see the tesamorelin guide.

Because the volume is small, precision at the syringe markings matters more than eyeballing. Draw to the exact line, clear the air bubbles, and confirm the volume before you inject. Use a 27 to 31 gauge insulin syringe, 1/2 inch length; PeRx includes appropriate syringes with each order.

Common Pitfalls

Injecting too close to the navel. Keep a two-inch radius clear. The tissue right around the belly button absorbs less predictably and is more sensitive.

Favoring one comfortable spot. The easiest square on your abdomen is also the one most likely to develop lipohypertrophy. Force yourself to rotate from day one.

Injecting into a scar, mole, tattoo, or visible vein. Avoid these entirely. Pick clean, unmarked skin a few inches away.

Injecting cold, fast solution. Cold liquid injected quickly is the most common cause of stinging. Let the vial sit out a minute or two and push the plunger slowly.

Reusing needles. Insulin syringes are single use. Reusing dulls the needle, which hurts more and adds tissue trauma that speeds up lump formation. PeRx ships ample syringes with each order.

If you are weighing side effects before you start, the peptide side effects guide covers what is common, what is rare, and what deserves a call to your provider.

Frequently Asked Questions

Reviewed by Dr. Cory Mellon, MD · Last reviewed July 2026