Nebido is a brand name for a long-acting injectable form of the androgen and anabolic steroid, testosterone undecanoate. It is a legally manufactured and medically regulated medication used for hormone replacement therapy (HRT). It is distinct from unregulated, illicit products like those made by underground labs.
Symptoms of hypogonadism can include:
- Erectile dysfunction and low libido
- Infertility
- Tiredness and depressive moods
- Reduced bone and muscle mass
- Hot flushes and sweating
Nebido is also sometimes used in masculinizing hormone therapy for transgender men.
- Gradual release: After injection, the compound is gradually released from the muscle “depot” into the bloodstream.
- Long half-life: This long-acting formulation provides stable testosterone levels over an extended period.
- Less frequent dosing: The injections are typically given every 10 to 14 weeks, making it a more convenient option than shorter-acting testosterone therapies.
- Increased red blood cell count
- Weight gain
- Hot flushes
- Prostate enlargement
- Mood disturbances (e.g., depression, anxiety, aggression)
- Headache and dizziness
- Cardiovascular issues
- Liver function changes
- Pulmonary oil microembolism: A rare but serious side effect involving the oil solution entering the lungs, causing symptoms like coughing, shortness of breath, and chest pain





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