Tesamorelin injection: Frequently asked questions

Transition to anterior thigh sites following the same rotation protocol. Divide each thigh into 4 sites (8 total across both legs) and cycle through them systematically. Avoid the inner thigh (higher nerve density and discomfort) and areas within 2 inches of the knee. Thigh absorption is 10–15% slower than abdominal administration based on subcutaneous blood flow studies, but this difference doesn't meaningfully impact tesamorelin's efficacy when used consistently.

You'll know immediately. Intramuscular injection produces a deeper, duller ache compared to the sharp sting of subcutaneous administration. Tesamorelin deposited intramuscularly is still absorbed, but the pharmacokinetics differ slightly: muscle has higher blood flow than subcutaneous fat, so absorption occurs faster but over a shorter duration. The injection itself will be more painful due to higher nerve density in muscle tissue. To avoid this, pinch the skin before injecting to lift subcutaneous fat away from underlying muscle, and ensure your needle angle stays at 45 degrees.

This indicates localized inflammatory response, likely from insufficient site rotation or overly rapid injection. Stop using the affected site for 10–14 days. Apply a cold compress immediately after injection to reduce capillary dilation, and ensure you're injecting over 10–15 seconds rather than rapidly. If lumps persist beyond two weeks, the tissue may have developed lipohypertrophy (fat deposits from repeated insulin or peptide injections), which requires extended rotation or switching to an alternative site permanently.

Skip that specific location for at least 10 days and move to the next site in your rotation sequence. Minor bruising from capillary puncture is common and harmless. It indicates you hit a small blood vessel during needle insertion, not an injection technique error. Apply gentle pressure with clean gauze for 30 seconds immediately after injection to minimise bleeding and bruise formation. If bruising occurs frequently (more than once per week), review your injection angle and ensure you're releasing the pinched skin fold before depressing the plunger. Injecting into tented skin increases vascular trauma risk.

Reduce injection volume per site. If you're administering more than 1.5 mL in a single injection, the volume itself may be exceeding the subcutaneous tissue's capacity to absorb without pressure buildup. Split the dose across two sites in the same session. For example, 0.75 mL in the left abdomen and 0.75 mL in the right abdomen. This distributes the depot load and eliminates localized pressure as a pain trigger.

A persistent subcutaneous nodule lasting more than 5 days suggests early lipohypertrophy or sterile inflammatory response. Stop using that site entirely until the lump completely resolves. Which may take 3–4 weeks. And expand your rotation to include alternative anatomical zones like the thighs. Permanent avoidance of that specific point prevents progressive tissue damage. Contact your prescribing physician if the lump enlarges, becomes painful, or shows signs of infection (warmth, spreading redness, purulent drainage).

Stop using the affected quadrant immediately and expand your rotation to the remaining abdominal zones. Mark the nodules visually and avoid them completely for 12–24 weeks. This is how long established lipohypertrophy takes to resolve. Injecting into damaged tissue reduces absorption by up to 30% and risks compressing blood vessels, further slowing peptide diffusion. Use the four-zone pattern in the unaffected areas, maintaining 5 cm spacing within each zone. Reintroduce the recovered area cautiously after palpation confirms the tissue has returned to normal softness.

Resume your rotation from where you left off. Don't skip ahead to "catch up" to the calendar. The priority is maintaining 72-hour intervals between uses of the same site, not rigid adherence to a weekly schedule. If you missed Wednesday's injection in the lower right quadrant, Thursday's injection should still go to the lower left quadrant as planned. The rotation pattern protects tissue recovery time, which is more important than maintaining a fixed weekly sequence. Missing one day doesn't disrupt the underlying biology if you preserve the spacing rule.

This indicates rotation failure. You've either violated spacing rules, used sites too frequently, or ignored early signs of lipohypertrophy. The immediate solution is to pause injections for 2–4 weeks to allow widespread tissue recovery, then restart with strict adherence to the four-zone pattern and 5 cm spacing. Consider expanding beyond the standard four quadrants to a six-zone pattern if your abdominal surface area allows it. Dividing each side into upper, middle, and lower zones increases the recovery interval to 5 days per site. This scenario is preventable and should never occur with proper technique from day one.