As Kenya searches for tougher responses to sexual violence, a government task force has proposed introducing “chemical castration” for convicted offenders, a move that has drawn mixed reactions from experts.
The Nation spoke to Dr Ahmed Ali Yousef, a consultant urologist and Head of Department at the Aga Khan University Hospital, who has spent three decades managing hormone levels in men, often treating prostate cancer by lowering testosterone, or helping patients with low levels raise it.
“I understand deeply how powerful these hormones are and what happens to the human body when we drastically manipulate them,” he warns. “Sexual offense is a devastating plague on society. The desire to find a solution is understandable. However, when we propose using strong medical agents as a tool of the justice system, we must be absolutely clear about what these drugs do, and what they do not do.”
Dr Yousef says that although the term "castration" sounds barbaric, in a medical context, it simply means stopping the testicles from producing functional hormones.
Below, he explains the medical realities of the process.
Unlike surgical castration, which is the physical removal of the testicles, chemical castration is the use of medication to shut down testosterone production.
Testosterone is the primary male sex hormone. It is the "fuel" that drives sexual desire (libido), allows for erections, and supports physical strength and energy. Chemical castration essentially turns off the fuel supply at the source.
Typically, it involves receiving an injection (a shot) either into a muscle or under the skin. Depending on the specific drug used, these shots must be given every month, every three months, or sometimes every six months. If the injections are stopped, the effects wear off.
Yes. In urology, "castrate level" is a specific medical benchmark. It means reducing the testosterone in the blood to extremely low numbers, the same low level as if the testicles had been surgically removed.
Simply lowering testosterone a little bit is not enough. To effectively and completely suppress sexual urge and physical erectile ability in a healthy man, the levels must be brought down to virtually zero.
Yes, and they are significant. Testosterone does much more than just control sex drive; it affects the entire body. Removing it suddenly causes a severe shock to the system.
Common physical side effects mimic intense menopause: severe hot flashes, night sweats, weight gain, loss of muscle mass, and breast tenderness or enlargement (gynecomastia).
More serious, long-term health risks include intense fatigue, brittle bones (osteoporosis) leading to fractures, an increased risk of diabetes and heart disease, and significant mental health changes, including severe depression and mood swings.
Generally, yes. This is the main difference between chemical and surgical castration.
If the offender stops receiving the injections, the body’s hormone signals usually wake back up. Over a period of several months, testosterone production typically returns to normal levels, and sexual function returns. It is not a permanent physical change to the body's structure.
6. As a specialist, do you think this lowers the intent of sexual activity?
This is the most critical question, and the answer requires nuance.
Medically, these drugs are highly effective at eliminating sexual drive (the urge) and sexual ability (getting an erection). Think of it as removing the engine from a car; the car will no longer drive.
However, these drugs do not change the "driver."
Sexual violence is rarely just about a physical urge for sex; it is often rooted in deep psychological issues, a need for power, aggression, and deviant thought patterns. Chemical castration does not erase memories, it does not change personality, and it does not fix twisted psychology or solve the problem.
While it may disable the physical weapon, I am sceptical that it removes the underlying intent or the psychological root of violent behaviour in predatory offenders. It must never be viewed as a "cure" on its own.
7. Can anyone get this, or are medical tests required?
As a doctor, I cannot ethically administer a drug that I know might kill a patient, regardless of their crimes. Therefore, rigorous medical testing is absolutely necessary beforehand.
These are powerful drugs with systemic effects. An offender with severe pre-existing heart disease, liver failure, or certain psychiatric conditions might suffer catastrophic health failures if given these medications. A thorough medical history, blood work, and cardiac screening would be essential before starting treatment to ensure they survive the process.
