In a written parliamentary reply on 8 September 2026, Senior Minister and Minister for Home Affairs K. Shanmugam said that Singapore is open to considering chemical castration for sexual offenders if there is clear evidence that it would reduce sexual offending. However, the Government’s position is that the evidence on its effectiveness in reducing crime remains inconclusive.
The issue has attracted renewed attention amid recent increases in some categories of sexual offences. In 2025, reported cases of rape increased from 401 to 479, while outrage of modesty cases increased from 1,427 to 1,531. The Government has nevertheless stated that the overall number of sexual assault cases has remained relatively stable at about 2,500 cases annually over the past five years.
This article explains:
- What chemical castration is
- Whether chemical castration is currently available as a punishment in Singapore
- Whether Singapore will introduce chemical castration for sex offenders
- The existing legal frameworks for dealing with sexual offenders
What is Chemical Castration?
Chemical castration refers generally to the use of medication to reduce the production or effects of sex hormones, particularly testosterone. The intended effect is to reduce sexual drive. Unlike surgical castration, it is generally reversible when treatment stops, although the precise effects depend on the medication and the individual.
The treatment is already used medically for conditions including certain hormone-sensitive cancers. Some jurisdictions, such as South Korea and Indonesia, have additionally authorised the use of hormone-suppressing treatment as part of their criminal justice systems for certain convicted sexual offenders.
Is Chemical Castration Currently Available as a Punishment in Singapore?
Importantly, chemical castration is not currently a sentencing option for sexual offenders in Singapore.
The existing Singapore criminal justice framework provides for imprisonment, fines, caning in specified cases and various forms of protective, rehabilitative or supervisory measures.
There is presently no statutory provision authorising a Singapore court to order an offender to undergo chemical castration as a criminal sentence. Introducing compulsory chemical castration would therefore require an appropriate legislative framework, rather than simply being adopted by the courts under the existing sentencing provisions for sexual offences.
Will Singapore Introduce Chemical Castration for Sex Offenders?
In response to a parliamentary question on whether Singapore would consider chemical castration in view of the increase in sexual offences, Minister Shanmugam said that Singapore remains open to considering pharmacological anti-androgen treatment if there is clear evidence that it is effective in bringing down crime rates.
The Government has not announced a decision to introduce chemical castration. The present position is instead that the measure could be considered if its effectiveness were sufficiently established.
This distinction is important. Reducing testosterone or sexual drive is a biological effect of the medication; whether that effect reliably reduces sexual offending or reoffending is a separate question. Research and international experience do not presently provide a conclusive answer. Some studies have reported reductions in sexual reoffending, while commentators have noted that sexual offences can arise from factors other than sexual drive, including motivations involving power, control and other psychological or behavioural factors.
How are Serious Sexual Offences Currently Dealt With in Singapore?
Singapore’s principal criminal legislation for sexual offences is the Penal Code.
The Penal Code covers a broad range of conduct, reflecting the fact that sexual offences are not a single category of crime. These include:
- Rape under section 375;
- Sexual assault involving penetration under section 376;
- Sexual penetration of minors below 16 under section 376A;
- Various offences involving the sexual exploitation, grooming or sexual communication of minors;
- Voyeurism and offences involving voyeuristic or intimate images; and
- Sexual exposure and other offences involving sexual misconduct.
The penalties vary according to the offence and circumstances. For example, rape and sexual assault involving penetration may attract imprisonment of up to 20 years, as well as a fine or caning. More serious circumstances can attract mandatory minimum imprisonment and caning.
The law also provides enhanced protection for certain vulnerable victims (e.g. where offences are committed against persons in specified intimate or close relationships, as well as provisions dealing specifically with offences against children and vulnerable persons).
Rehabilitation and treatment of sexual offenders
In addition to the penalties provided for under the Penal Code, Singapore’s approach to sexual offenders also includes various rehabilitation and treatment programmes.
For example, the Singapore Prison Service runs Sexual Offending Programmes designed to address factors associated with offending behaviour.
Other correctional measures can continue after imprisonment. The Mandatory Aftercare Scheme, for example, provides structured supervision and support for selected ex-offenders and may involve conditions such as residential requirements, curfews and electronic monitoring.
There are also existing legal mechanisms for treatment in appropriate cases. Under section 339 of the Criminal Procedure Code, a court may make a Mandatory Treatment Order requiring an offender to undergo psychiatric treatment for up to 36 months, subject to statutory requirements including an assessment by an appointed psychiatrist.
Sentence for Enhanced Public Protection (SEPP)
The Sentence for Enhanced Public Protection (SEPP), which commenced on 31 July 2026, applies to specified serious violent or sexual offences where the offender poses a substantial threat of causing serious physical or sexual harm. It can also apply in certain circumstances involving repeat offenders.
Where SEPP is imposed, the court specifies a minimum period of custody of between five and 20 years, subject to the statutory requirements. After that minimum period, the offender may only be released if assessed as suitable for release; otherwise, detention can continue until the offender is considered suitable for release.
SEPP is principally a public-protection and risk-management mechanism. The legislation also provides safeguards, including psychiatric risk assessments and periodic consideration of whether an offender is suitable for release.
The Government has described SEPP as a means of better protecting the public from serious violent or sexual offenders who present a substantial risk of reoffending.
You can refer to our other article for a more detailed overview of SEPP.
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Chemical castration is not presently part of Singapore’s sentencing framework for sexual offenders. The Government has indicated that it is open to considering anti-androgen treatment if there is clear evidence that it reduces crime, but no decision has been announced to introduce it.
For now, Singapore’s approach combines criminal penalties under the Penal Code with increasingly targeted public-protection measures, rehabilitation programmes, post-release supervision and screening arrangements.
The recently commenced SEPP regime is particularly significant because it provides a statutory mechanism for extended detention of certain serious sexual or violent offenders who present a substantial risk of causing further serious harm.
