Adverse Effects and Safety Profile of Testosterone Pellets

Local and Implant‑Site Complications

• Pain, soreness, bruising, erythema, swelling, nodules, furuncles, and extrusion of the pellet at the implantation site are documented adverse events of testosterone pellet therapy【1】【2】.

Hematologic Effects

• Erythrocytosis (elevated hematocrit) occurs in roughly 2.8 %– 43.8 % of individuals receiving testosterone pellets, with the exact rate varying by formulation【2】.

Fluid Retention

• Mild and uncommon fluid retention may develop, warranting caution in patients with congestive heart failure or renal insufficiency【1】.

Dermatologic Effects

• Acne, oily skin, and increased body hair are reported skin‑related side effects of testosterone pellet implantation【1】.

Endocrine and Reproductive Effects

• Breast tenderness, gynecomastia, testicular atrophy, and suppression of spermatogenesis have been observed in men treated with testosterone pellets【1】【2】.

Sleep‑Related Effects

• Exacerbation of existing sleep apnea or new‑onset sleep‑disordered breathing can occur during testosterone pellet therapy【1】.

Pharmacokinetic Profile of Pellets

• Testosterone pellets deliver stable, physiologic testosterone concentrations for 4–6 months via zero‑order absorption; peak levels are typically reached at about 1 month and then gradually decline【3】【2】.

Tremor Not Associated with Testosterone Therapy

• Tremor is not listed among the recognized adverse effects of testosterone replacement therapy in any formulation, including pellets【1】【2】.