Side Effects
Tesamorelin demonstrates generally good tolerability, with most adverse effects ranging from mild to moderate severity.
Common Side Effects (occurring in >5% of patients):
- Injection site reactions including erythema, pruritus, pain, and swelling, affects approximately 8-13% of users, typically diminishing with continued use and proper injection site rotation
- Arthralgia (joint pain) and myalgia (muscle pain), occurs in approximately 10-13% of patients, likely related to GH-mediated fluid retention and tissue effects
- Peripheral edema and paresthesias (tingling sensations), affects roughly 5-6% of users
Less Common Side Effects:
- Carpal tunnel syndrome symptoms
- Glucose intolerance
- Hypersensitivity reactions
Patients with pre-existing glucose intolerance should monitor blood sugar carefully, as GH can antagonize insulin action. In the pivotal trials, the odds of developing diabetes were approximately 3.3 times higher with tesamorelin than placebo (roughly 5% versus 1% over 26 weeks), reinforcing the importance of glucose monitoring during treatment.
Contraindications:
Tesamorelin remains contraindicated in patients with:
- Active malignancy
- Disruption of the hypothalamic-pituitary axis due to conditions such as hypophysectomy or pituitary tumor
- Pregnancy
- Known hypersensitivity to tesamorelin or mannitol